<?php
/**
 * @psalm-template TKey as array-key
 * @psalm-template TArray as array<TKey, mixed>
 *
 * @param TArray $array
 * @param mixed $search_value
 * @param bool  $strict
 *
 * @return (TArray is non-empty-array ? non-empty-list<TKey> : list<TKey>)
 * @psalm-pure
 */
function array_keys(array $array, $search_value = null, bool $strict = false)
{
}

/**
 * @psalm-template TKey as array-key
 * @psalm-template TValue
 *
 * @param array<TKey, TValue> $array
 * @param array ...$arrays
 *
 * @return array<TKey, TValue>
 * @psalm-pure
 */
function array_intersect(array $array, array ...$arrays)
{
}

/**
 * @psalm-template TKey as array-key
 * @psalm-template TValue
 *
 * @param array<TKey, TValue> $array
 * @param array ...$arrays
 *
 * @return array<TKey, TValue>
 * @psalm-pure
 */
function array_intersect_key(array $array, array ...$arrays)
{
}

/**
 * @psalm-template TKey as array-key
 * @psalm-template TValue
 *
 * @param array<TKey, TValue> $array
 * @param array ...$arrays
 *
 * @return array<TKey, TValue>
 * @psalm-pure
 */
function array_intersect_assoc(array $array, array ...$arrays)
{
}

/**
 * @psalm-template TKey as array-key
 * @psalm-template TValue
 *
 * @param array<mixed, TKey> $keys
 * @param array<mixed, TValue> $values
 *
 * @return (
 *     PHP_MAJOR_VERSION is 8 ?
 *         ($keys is non-empty-array ? non-empty-array<TKey, TValue> : array<TKey, TValue>) :
 *         ($keys is non-empty-array ? non-empty-array<TKey, TValue>|false : array<TKey, TValue>|false)
 * )
 * @psalm-ignore-falsable-return
 * @psalm-pure
 */
function array_combine(array $keys, array $values)
{
}

/**
 * @psalm-template TKey as array-key
 * @psalm-template TValue
 *
 * @param array<TKey, TValue> $array
 * @param array ...$arrays
 *
 * @return array<TKey, TValue>
 * @psalm-pure
 */
function array_diff(array $array, array ...$arrays)
{
}

/**
 * @psalm-template TKey as array-key
 * @psalm-template TValue
 *
 * @param array<TKey, TValue> $array
 * @param array ...$arrays
 *
 * @return array<TKey, TValue>
 * @psalm-pure
 */
function array_diff_key(array $array, array ...$arrays)
{
}

/**
 * @psalm-template TKey as array-key
 * @psalm-template TValue
 *
 * @param array<TKey, TValue> $array
 * @param array ...$arrays
 *
 * @return array<TKey, TValue>
 * @psalm-pure
 */
function array_diff_assoc(array $array, array ...$arrays)
{
}

/**
 * @psalm-template TKey as array-key
 * @psalm-template TValue
 *
 * @param array<TKey, TValue> $array
 *
 * @return array<TValue, TKey>
 * @psalm-pure
 */
function array_flip(array $array)
{
}

/**
 * @psalm-template TKey as array-key
 * @psalm-template TArray as array<TKey, mixed>
 *
 * @param TArray $array
 *
 * @return (TArray is array<empty, empty> ? null : TKey|null)
 * @psalm-pure
 * @psalm-ignore-nullable-return
 */
function key($array)
{
}

/**
 * @psalm-template TKey as array-key
 * @psalm-template TArray as array<TKey, mixed>
 *
 * @param TArray $array
 *
 * @return (TArray is array<empty, empty> ? null : (TArray is non-empty-array ? TKey : TKey|null))
 * @psalm-pure
 */
function array_key_first($array)
{
}

/**
 * @psalm-template TKey as array-key
 * @psalm-template TArray as array<TKey, mixed>
 *
 * @param TArray $array
 *
 * @return (TArray is array<empty, empty> ? null : (TArray is non-empty-array ? TKey : TKey|null))
 * @psalm-pure
 */
function array_key_last($array)
{
}

/**
 * @psalm-template T
 *
 * @param mixed           $needle
 * @param array<T, mixed> $haystack
 * @param bool            $strict
 *
 * @return T|false
 * @psalm-pure
 */
function array_search($needle, array $haystack, bool $strict = false)
{
}

/**
 * @psalm-template T
 *
 * @param T[] $array
 * @param-out list<T> $array
 */
function shuffle(array &$array): bool
{
}

/**
 * @psalm-template T
 *
 * @param T[] $array
 * @param-out list<T> $array
 */
function sort(array &$array, int $flags = SORT_REGULAR): bool
{
}

/**
 * @psalm-template T
 *
 * @param T[] $array
 * @param-out list<T> $array
 */
function rsort(array &$array, int $flags = SORT_REGULAR): bool
{
}

/**
 * @psalm-template T
 *
 * @param T[] $array
 * @param callable(T,T):int $callback
 * @param-out list<T> $array
 */
function usort(array &$array, callable $callback): bool
{
}

/**
 * @psalm-template TKey
 * @psalm-template T
 *
 * @param array<TKey,T> $array
 * @param callable(T,T):int $callback
 * @param-out array<TKey,T> $array
 */
function uasort(array &$array, callable $callback): bool
{
}

/**
 * @psalm-template TKey
 * @psalm-template T
 *
 * @param array<TKey,T> $array
 * @param callable(TKey,TKey):int $callback
 * @param-out array<TKey,T> $array
 */
function uksort(array &$array, callable $callback): bool
{
}

/**
 * @psalm-pure
 *
 * @psalm-template K of array-key
 * @psalm-template T
 *
 * @param array<K,T> $array
 *
 * @return array<K,T>
 */
function array_change_key_case(array $array, int $case = CASE_LOWER)
{
}

/**
 * @psalm-pure
 *
 * @psalm-template TKey as array-key
 *
 * @param TKey $key
 * @param array<TKey, mixed> $array
 *
 * @return bool
 */
function array_key_exists($key, array $array) : bool
{
}

/**
 * @psalm-pure
 *
 * @psalm-template TKey as array-key
 * @psalm-template TValue
 *
 * @param array<TKey, TValue> ...$arrays
 *
 * @return array<TKey, TValue>
 */
function array_merge_recursive(array ...$arrays)
{
}

/**
 * @psalm-pure
 *
 * @psalm-template TKey as array-key
 * @psalm-template TValue
 *
 * @param array<TKey> $keys
 * @param TValue $value
 *
 * @return array<TKey, TValue>
 */
function array_fill_keys(array $keys, $value): array
{
}

/**
 * @psalm-pure
 *
 * @psalm-template TKey
 *
 * @param string $pattern
 * @param array<TKey,string> $array
 * @param 0|1 $flags 1=PREG_GREP_INVERT
 * @return array<TKey,string>
 */
function preg_grep($pattern, array $array, $flags = 0)
{
}

/**
 * @param resource $stream
 * @param-out closed-resource $stream
 */
function fclose(&$stream) : bool
{
}

/**
 * @param string $string
 * @param-out null $string
 */
function sodium_memzero(string &$string): void
{
}

/**
 * @param mixed $value
 * @param bool $return
 * @return ($return is true ? string : void)
 *
 * @psalm-taint-specialize
 * @psalm-flow ($value) -> return
 * @psalm-taint-sink html $value
 */
function var_export($value, bool $return = false) {}

/**
 * @param mixed $value
 * @param list<mixed> $values
 * @return string
 *
 * @psalm-taint-specialize
 * @psalm-flow ($value, $values) -> return
 * @psalm-taint-sink html $value
 * @psalm-taint-sink html $values
 */
function var_dump($value, ...$values) {}

/**
 * @param mixed $value
 * @param bool $return
 * @return ($return is true ? string : true)
 *
 * @psalm-taint-specialize
 * @psalm-flow ($value) -> return
 * @psalm-taint-sink html $value
 */
function print_r($value, bool $return = false) {}

/**
 * @psalm-pure
 *
 * @psalm-taint-sink file $filename
 * @param mixed $filename
 * @return ($return is true ? string : bool)
 */
function highlight_file($filename, bool $return = false) {}

/**
 * @psalm-pure
 *
 * @psalm-taint-sink file $filename
 * @param mixed $filename
 * @return ($return is true ? string : bool)
 */
function show_source($filename, bool $return = false) {}

/**
 * @psalm-pure
 *
 * @psalm-taint-sink file $filename
 */
function php_strip_whitespace(string $filename) : string {}

/**
 * @psalm-pure
 *
 * @param mixed $string
 * @return ($return is true ? string : bool)
 *
 * @psalm-flow ($string) -> return
 */
function highlight_string($string, bool $return = false) {}

/**
 * @psalm-pure
 *
 * @return ($as_float is true ? float : string)
 */
function microtime(bool $as_float = false) {}

/**
 * @psalm-pure
 *
 * @return ($as_float is true ? float : array<string, int>)
 */
function gettimeofday(bool $as_float = false) {}

/**
 * @psalm-pure
 *
 * @param numeric $num
 * @return ($num is int ? positive-int|0 : ($num is float ? float : positive-int|0|float))
 */
function abs($num) {}

/**
 * @psalm-pure
 *
 * @template T as string|int|float
 * @template TStep as int|float
 * @param T $start
 * @param T $end
 * @param TStep $step
 * @return (
 *     T is int
 *     ? (TStep is int ? non-empty-list<int> : non-empty-list<float>)
 *     : (
 *         T is float
 *         ? non-empty-list<float>
 *         : (
 *              T is string
 *              ? non-empty-list<string>
 *              : (
 *                   T is int|float
 *                   ? non-empty-list<int|float>
 *                   : non-empty-list<int|float|string>
 *              )
 *         )
 *     )
 * )
 */
function range($start, $end, $step = 1) {}

/**
 * @psalm-pure
 *
 * @return (
 *     $format is 'd'|'j'|'N'|'w'|'z'|'W'|'m'|'n'|'t'|'L'|'o'|'Y'|'y'|'B'|'g'|'G'|'h'|'H'|'i'|'s'|'u'|'v'|'Z'|'U'|'I'
 *     ? numeric-string
 *     : ($timestamp is numeric ? string : string|false)
 * )
 */
function date(string $format, int $timestamp = 0) {}

/**
 * @psalm-pure
 *
 * @param mixed $vars
 * @param-out string|int|float|null $vars
 * @psalm-flow ($string, $format) -> return
 * @return (func_num_args() is 2 ? (null|list<float|int|string|null>) : int)
 */
function sscanf(string $string, string $format, &...$vars) {}

/**
 * @psalm-pure
 *
 * @return (
 *     func_num_args() is 1
 *     ? array{dirname: string, basename: string, extension?: string, filename: string}
 *     : string
 * )
 */
function pathinfo(string $path, int $flags = \PATHINFO_DIRNAME) {}

/**
 * @psalm-pure
 *
 * @return (func_num_args() is 0 ? array<string, string> : string|false)
 */
function getenv(string $varname = '', bool $local_only = false) {}

/**
 * @psalm-pure
 *
 * @return (
 *     $string is non-empty-string ? non-empty-lowercase-string : lowercase-string
 * )
 *
 * @psalm-flow ($string) -> return
 */
function strtolower(string $string) : string {}

/**
 * @psalm-pure
 *
 * @return (
 *     $string is non-falsy-string
 *     ? non-falsy-string
 *     : ($string is non-empty-string ? non-empty-string : string)
 * )
 *
 * @psalm-flow ($string) -> return
 */
function strtoupper(string $string) : string {}

/**
 * @psalm-pure
 *
 * @param string|array<string> $string
 * @param string|array<string> $replace
 * @param int|array<int> $offset
 * @param null|int|array<int> $length
 *
 * @return ($string is array<string> ? array<string> : string)
 *
 * @psalm-flow ($string, $replace) -> return
 */
function substr_replace($string, $replace, $offset, $length = null) {}

/**
 * @psalm-pure
 *
 * @param string $haystack
 *
 * @psalm-return positive-int|0|false
 */
function strpos($haystack, $needle, int $offset = 0) : int {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function trim(string $string, string $characters = " \t\n\r\0\x0B") : string {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function ltrim(string $string, string $characters = " \t\n\r\0\x0B") : string {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function rtrim(string $string, string $characters = " \t\n\r\0\x0B") : string {}

/**
 * @psalm-pure
 *
 * @param string|array $separator
 * @param array<string|float|int|stringable-object|null|bool> $array
 *
 * @return (
 *     $separator is non-empty-string
 *     ? ($array is non-empty-array
 *         ? ($array is array<literal-string|literal-int>
 *             ? ($separator is literal-string ? non-empty-literal-string : non-empty-string)
 *             : non-empty-string
 *         )
 *         : string)
 *     : string
 * )
 *
 * @psalm-flow ($separator) -> return
 * @psalm-flow ($array) -(array-fetch)-> return
 */
function implode($separator, array $array = []) : string {}

/**
 * @psalm-pure
 *
 * @param string|array $separator
 * @param array<string|float|int|stringable-object|null|bool> $array
 *
 * @return (
 *     $separator is non-empty-string
 *     ? ($array is non-empty-array
 *         ? ($array is array<literal-string|literal-int>
 *             ? ($separator is literal-string ? non-empty-literal-string : non-empty-string)
 *             : non-empty-string
 *         )
 *         : string)
 *     : string
 * )
 *
 * @psalm-flow ($separator) -> return
 * @psalm-flow ($array) -(array-fetch)-> return
 */
function join($separator, array $array = []): string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -(array-assignment)-> return
 */
function explode(string $separator, string $string, int $limit = -1) : array {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($subject) -(array-assignment)-> return
 *
 * @template TFlags as int-mask<0, 1, 2, 4>
 *
 * @param TFlags $flags
 *
 * @return (TFlags is 0|2 ? non-empty-list<string>|false : (TFlags is 1|3 ? list<string>|false : list<array{string,int}>|false))
 *
 * @psalm-ignore-falsable-return
 */
function preg_split(string $pattern, string $subject, int $limit = -1, int $flags = 0) {}

/**
 * @param array $array
 *
 * @return (
 *     $array is array<int>
 *     ? int
 *     : ($array is array<float>
 *         ? float
 *         : float|int
 *     )
 * )
 */
function array_sum(array $array) {}

/**
 * @param array $array
 *
 * @return (
 *     $array is array<int>
 *     ? int
 *     : ($array is array<float>
 *         ? float
 *         : float|int
 *     )
 * )
 */
function array_product(array $array) {}

/**
 * 257 is FILTER_VALIDATE_INT
 * @psalm-taint-escape ($filter is 257 ? 'html' : null)
 *
 * 258 is FILTER_VALIDATE_BOOLEAN
 * @psalm-taint-escape ($filter is 258 ? 'html' : null)
 *
 * 259 is FILTER_VALIDATE_FLOAT
 * @psalm-taint-escape ($filter is 259 ? 'html' : null)
 *
 * @psalm-flow ($value, $filter, $options) -> return
 */
function filter_var(mixed $value, int $filter = FILTER_DEFAULT, array|int $options = 0): mixed {}

/**
 * @psalm-pure
 *
 * @psalm-taint-escape html
 * @psalm-flow ($string) -> return
 */
function strip_tags(string $string, ?string $allowed_tags = null) : string {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function stripcslashes(string $string) : string {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function stripslashes(string $string) : string {}

/**
 * @psalm-pure
 *
 * Tainting is handled in a plugin
 *
 * @psalm-flow ($string) -> return
 */
function htmlentities(string $string, ?int $flags = null, ?string $encoding = null, bool $double_encode = true) : string {}

/**
 * @psalm-pure
 *
 * Tainting is handled in a plugin
 *
 * @psalm-flow ($string) -> return
 */
function html_entity_decode(string $string, ?int $flags = null, ?string $encoding = null) : string {}

/**
 * @psalm-pure
 *
 * Tainting is handled in a plugin
 *
 * @psalm-flow ($string) -> return
 * @psalm-return (
 *     $string is non-empty-string
 *     ? non-empty-string
 *     : string
 * )
 */
function htmlspecialchars(string $string, int $flags = ENT_COMPAT | ENT_HTML401, ?string $encoding = 'UTF-8', bool $double_encode = true) : string {}

/**
 * @psalm-pure
 *
 * Tainting is handled in a plugin
 *
 * @psalm-flow ($string) -> return
 */
function htmlspecialchars_decode(string $string, ?int $flags = null) : string {}

/**
 * @psalm-pure
 *
 * @psalm-return (
 *     $string is ''
 *     ? 0
 *     : (
 *          $string is non-empty-string
 *              ? positive-int
 *              : (0|positive-int)
 *     )
 * )
 */
function strlen(string $string) : int {}

/**
 * @psalm-pure
 *
 * @param string|array<string|int|float> $search
 * @param string|array<string|int|float> $replace
 * @param string|array<string|int|float> $subject
 * @param int $count
 * @return ($subject is array ? array<string> : string)
 *
 * @psalm-flow ($replace, $subject) -> return
 */
function str_replace($search, $replace, $subject, &$count = null) {}

/**
 * @psalm-pure
 *
 * @param string|array<string|int|float> $search
 * @param string|array<string|int|float> $replace
 * @param string|array<string|int|float> $subject
 * @param int $count
 * @return ($subject is array ? array<string> : string)
 *
 * @psalm-flow ($replace, $subject) -> return
 */
function str_ireplace($search, $replace, $subject, &$count = null) {}

/**
 * @psalm-pure
 *
 * @return ($string is non-empty-string ? non-empty-string : ($length is positive-int ? non-empty-string: string))
 *
 * @psalm-flow ($string, $pad_string) -> return
 */
function str_pad(string $string, int $length, $pad_string = '', int $pad_type = STR_PAD_RIGHT): string {}

/**
 * @psalm-pure
 *
 * @todo update $times to be `0|positive-int`
 * @return (
 *      $string is non-empty-string
 *      ? (
 *          $times is positive-int
 *          ? non-empty-string
 *          : ($times is 0 ? '' : string)
 *      )
 *      : ($times is 0 ? '' : string)
 * )
 *
 * @psalm-flow ($string) -> return
 */
function str_repeat(string $string, int $times): string {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function str_rot13(string $string): string {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function str_shuffle(string $string): string {}

/**
 * @psalm-pure
 * @return ($length is positive-int ? list<string> : false)
 *
 * @psalm-flow ($string) -> return
 */
function str_split(string $string, int $length = 1) {}

/**
 * @psalm-pure
 * @return string|false
 * @psalm-ignore-falsable-return
 *
 * @psalm-flow ($haystack) -> return
 */
function strstr(string $haystack, string $needle, bool $before_needle = false) {}

/**
 * @psalm-pure
 * @return string|false
 * @psalm-ignore-falsable-return
 *
 * @psalm-flow ($haystack) -> return
 */
function stristr(string $haystack, string $needle, bool $before_needle = false) {}

/**
 * @psalm-pure
 * @return string|false
 * @psalm-ignore-falsable-return
 *
 * @psalm-flow ($haystack) -> return
 */
function strchr(string $haystack, string $needle, bool $before_needle = false) {}

/**
 * @psalm-pure
 * @return string|false
 * @psalm-ignore-falsable-return
 *
 * @psalm-flow ($string) -> return
 */
function strpbrk(string $string, string $characters) {}

/**
 * @psalm-pure
 * @return string|false
 * @psalm-ignore-falsable-return
 *
 * @psalm-flow ($haystack) -> return
 */
function strrchr(string $haystack, string $needle) {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function strrev(string $string): string {}

/**
 * @psalm-pure
 *
 * @param 0|1|2 $format
 * @return (
 *     $format is 0 ?
 *     int :
 *     (
 *         $format is 1 ?
 *         list<string> :
 *         array<int, string>
 *     )
 * )
 */
function str_word_count(string $string, int $format = 0, string|null $characters = null) {}

/**
 * @psalm-pure
 *
 * @param string|string[] $pattern
 * @param string|array<string|int|float> $replacement
 * @param string|array<string|int|float> $subject
 * @param int $count
 * @return ($subject is array ? array<string> : string|null)
 *
 * @psalm-flow ($replacement, $subject) -> return
 */
function preg_filter($pattern, $replacement, $subject, int $limit = -1, &$count = null) {}

/**
 * @psalm-pure
 *
 * @param string|string[] $pattern
 * @param string|array<string|int|float> $replacement
 * @param string|array<string|int|float> $subject
 * @param int $count
 * @return ($subject is array ? array<string>|null : string|null)
 *
 * @psalm-flow ($replacement, $subject) -> return
 */
function preg_replace($pattern, $replacement, $subject, int $limit = -1, &$count = null) {}

/**
 * @param string|string[] $pattern
 * @param callable(string[]):string $callback
 * @param string|array<string|int|float> $subject
 * @param int $count
 * @return ($subject is array ? array<string>|null : string|null)
 *
 * @psalm-taint-specialize
 * @psalm-flow ($subject) -> return
 */
function preg_replace_callback($pattern, $callback, $subject, int $limit = -1, &$count = null, int $flags = 0) {}

/**
 * @psalm-pure
 * @template TFlags as int
 *
 * @param string $pattern
 * @param string $subject
 * @param mixed $matches
 * @param TFlags $flags
 * @param-out (
 *          TFlags is 1
 *          ? array<list<string>>
 *          : (TFlags is 2
 *              ? list<array<string>>
 *              : (TFlags is 256|257
 *                  ? array<list<array{string, int}>>
 *                  : (TFlags is 258
 *                      ? list<array<array{string, int}>>
 *                      : (TFlags is 512|513
 *                          ? array<list<?string>>
 *                          : (TFlags is 514
 *                              ? list<array<?string>>
 *                              : (TFlags is 770
 *                                  ? list<array<array{?string, int}>>
 *                                  : array
 *                              )
 *                          )
 *                      )
 *                  )
 *              )
 *          )
 *        ) $matches
 * @return int|false
 * @psalm-ignore-falsable-return
 */
function preg_match_all($pattern, $subject, &$matches = [], int $flags = 1, int $offset = 0) {}

/**
 * @psalm-pure
 * @template TFlags as int-mask<0, 256, 512>
 *
 * @param string $pattern
 * @param string $subject
 * @param mixed $matches
 * @param TFlags $flags
 * @param-out (TFlags is 256 ? array<array-key, array{string, 0|positive-int}|array{'', -1}> :
 *             TFlags is 512 ? array<array-key, string|null> :
 *             TFlags is 768 ? array<array-key, array{string, 0|positive-int}|array{null, -1}> :
 *                             array<array-key, string>
 *            ) $matches
 * @return 1|0|false
 * @psalm-ignore-falsable-return
 */
function preg_match($pattern, $subject, &$matches = [], int $flags = 0, int $offset = 0) {}

/**
 * @psalm-pure
 *
 * @return (PHP_MAJOR_VERSION is 5|7 ? string|false : string)
 * @psalm-ignore-falsable-return
 *
 * @psalm-flow ($string) -> return
 */
function substr(string $string, int $offset, ?int $length = null) {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($str) -> return
 */
function preg_quote(string $str, ?string $delimiter = null) : string {}

/**
 * @psalm-pure
 *
 * @param string|int|float $values
 *
 * @psalm-flow ($format, $values) -> return
 */
function sprintf(string $format, ...$values) : string {}

/**
 * @psalm-pure
 * @return string|false
 * @psalm-ignore-falsable-return
 *
 * @psalm-flow ($format, $values) -> return
 */
function vsprintf(string $format, array $values) {}

/**
 * @psalm-pure
 * @return string
 *
 * @psalm-flow ($string) -> return
 */
function wordwrap(string $string, int $width = 75, string $break = "\n", bool $cut_long_words = false) : string {}

/**
 * @psalm-pure
 *
 * @param string|int|float $values
 *
 * @psalm-taint-specialize
 * @psalm-flow ($format, $values) -> return
 * @psalm-taint-sink html $format
 * @psalm-taint-sink html $values
 */
function printf(string $format, ...$values) : string {}

/**
 * @psalm-taint-specialize
 * @psalm-taint-sink html $format
 * @psalm-taint-sink html $values
 */
function vprintf(string $format, array $values) : int {}

/**
 * @psalm-pure
 *
 * @return string|false
 * @psalm-ignore-falsable-return
 *
 * @psalm-flow ($path) -> return
 */
function realpath(string $path) {}

/**
 * @psalm-pure
 *
 * @param numeric-string $num1
 * @param numeric-string $num2
 * @return (PHP_MAJOR_VERSION is 8 ? numeric-string : ($num2 is "0" ? null : numeric-string))
 */
function bcdiv(string $num1, string $num2, int $scale = 0): ?string {}

/**
 * @psalm-pure
 *
 * @param scalar|null|object $value
 * @return string The string value of var.
 *
 * @psalm-flow ($value) -> return
 */
function strval ($value): string {}

/**
 * @return ($string is non-empty-string ? non-empty-list<string> : non-empty-list<string>|array{null})
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function str_getcsv(string $string, string $separator = ',', string $enclosure = '"', string $escape = '\\\\')
{
}

/**
 * @template TKey as array-key
 * @template TArray as array<mixed, TKey>
 *
 * @param TArray $array
 *
 * @return (TArray is non-empty-array ? non-empty-array<TKey, positive-int> : array<TKey, positive-int>)
 *
 * @psalm-pure
 */
function array_count_values(array $array): array {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function addcslashes(string $string, string $characters) : string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function addslashes(string $string): string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function ucfirst(string $string): string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string, $separators) -> return
 */
function ucwords (string $string, string $separators = " \t\r\n\f\v"): string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function lcfirst(string $string): string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function nl2br(string $string, bool $use_xhtml = false): string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function quoted_printable_decode(string $string): string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function quoted_printable_encode(string $string): string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function quotemeta(string $string): string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function chop(string $string, string $characters = " \t\n\r\0\x0B"): string
{
}

/**
 * @psalm-pure
 * @psalm-flow ($string, $separator) -> return
 */
function chunk_split(string $string, int $length = 76, string $separator= ''): string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function convert_uudecode(string $string): string
{
}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function convert_uuencode(string $string) : string
{
}

/**
 * @psalm-pure
 *
 * @psalm-taint-escape ldap
 * @psalm-flow ($value) -> return
 */
function ldap_escape(string $value, string $ignore = "", int $flags = 0) : string {}

/**
 * @psalm-pure
 *
 * @return mixed
 * @psalm-flow ($json) -> return
 */
function json_decode(string $json, ?bool $associative = null, int $depth = 512, int $flags = 0) {}

/**
 * @psalm-pure
 *
 * @return ($flags is 4194304 ? string : string|false)
 *
 * @psalm-flow ($value) -> return
 * @psalm-ignore-falsable-return
 */
function json_encode(mixed $value, int $flags = 0, int $depth = 512) {}

/**
 * @psalm-pure
 *
 * @return string|false
 *
 * @psalm-flow ($values) -> return
 * @psalm-ignore-falsable-return
 */
function pack(string $format, mixed ...$values) {}

/**
 * @psalm-pure
 *
 * @param string|int $in_codepage
 * @param string|int $out_codepage
 * @psalm-flow ($subject) -> return
 */
function sapi_windows_cp_conv($in_codepage, $out_codepage, string $subject) : string {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($prefix) -> return
 */
function uniqid(string $prefix = "", bool $more_entropy = false) : string {}

/**
 * @psalm-pure
 *
 * @return array|false
 * @psalm-ignore-falsable-return
 *
 * @psalm-flow ($string) -> return
 */
function unpack(string $format, string $string, int $offset = 0) {}

/**
 * @psalm-pure
 *
 * @return string|false
 *
 * @psalm-flow ($string) -> return
 * @psalm-ignore-falsable-return
 */
function base64_decode(string $string, bool $strict = false) {}

/**
 * @psalm-pure
 *
 * @psalm-flow ($string) -> return
 */
function base64_encode(string $string) : string {}

/**
 * @psalm-pure
 *
 * @param resource|null $context
 *
 * @return ($associative is 0 ? list<string> : array<string, string|list<string>>)|false
 *
 * @psalm-taint-sink ssrf $url
 */
function get_headers(string $url, int $associative = 0, $context = null) : array|false {}

/**
 * @psalm-pure
 *
 * @return array<lowercase-string, string>|false
 *
 * @psalm-taint-sink ssrf $filename
 */
function get_meta_tags(string $filename, bool $use_include_path = false) : array|false {}

/**
 * @return ($categorize is false ? array<string,int|string|float|bool|null|array|resource> : array<string, array<string,int|string|float|bool|null|array|resource>>)
 */
function get_defined_constants(bool $categorize = false): array {}

/**
 * @param mixed $object_or_class
 * @param class-string $class
 * @return ($allow_string is false ? ($object_or_class is object ? bool : false) : bool)
 */
function is_a($object_or_class, string $class, $allow_string = false): bool{}

/**
 * @template T of array|string
 * @param T $string
 * @return (T is array<int, string> ? array<int, string> : T is array ? array : string|false)
 * @psalm-ignore-falsable-return
 */
function mb_convert_encoding(array|string $string, string $to_encoding, array|string|null $from_encoding = null): array|string|false{}