amp/lib/Internal/functions.php

<?php

namespace Amp\Internal;

/**
 * Formats a stacktrace obtained via `debug_backtrace()`.
 *
 * @param array $trace Output of `debug_backtrace()`.
 *
 * @return string Formatted stacktrace.
 *
 * @codeCoverageIgnore
 * @internal
 */
function formatStacktrace(array $trace): string {
    return implode("\n", array_map(function ($e, $i) {
        $line = "#{$i} {$e['file']}:{$e['line']} ";

        if ($e["type"]) {
            $line .= $e["class"] . $e["type"];
        }

        return $line . $e["function"] . "()";
    }, $trace, array_keys($trace)));
}

/**
 * Creates a `TypeError` with a standardized error message.
 *
 * @param string[] $expected Expected types.
 * @param mixed $given Given value.
 *
 * @return \TypeError
 *
 * @internal
 */
function createTypeError(array $expected, $given): \TypeError {
    $givenType = \is_object($given) ? \sprintf("instance of %s", \get_class($given)) : \gettype($given);

    if (\count($expected) === 1) {
        $expectedType = "Expected the following type: " . \array_pop($expected);
    } else {
        $expectedType = "Expected one of the following types: " . \implode(", ", $expected);
    }

    return new \TypeError("{$expectedType}; {$givenType} given");
}