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@ -20,12 +20,19 @@ Psalm supports a wide range of docblock annotations.
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Psalm uses the following PHPDoc tags to understand your code:
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- [`@var`](https://docs.phpdoc.org/references/phpdoc/tags/var.html)
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Used for specifying the types of properties and variables
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- [`@return`](https://docs.phpdoc.org/references/phpdoc/tags/return.html)
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Used for specifying the return types of functions, methods and closures
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- [`@param`](https://docs.phpdoc.org/references/phpdoc/tags/param.html)
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Used for specifying types of parameters passed to functions, methods and closures
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- [`@property`](https://docs.phpdoc.org/references/phpdoc/tags/property.html)
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Used to specify what properties can be accessed on an object that uses `__get` and `__set`
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- [`@property-read`](https://docs.phpdoc.org/references/phpdoc/tags/property-read.html)
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Used to specify what properties can be read on object that uses `__get`
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- [`@property-write`](https://docs.phpdoc.org/references/phpdoc/tags/property-write.html)
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Used to specify what properties can be written on object that uses `__set`
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- [`@deprecated`](https://docs.phpdoc.org/references/phpdoc/tags/deprecated.html)
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Used to mark functions, methods, classes and interfaces as being deprecated
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### Off-label usage of the `@var` tag
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@ -33,7 +40,7 @@ The `@var` tag is supposed to only be used for properties. Psalm, taking a lead
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If `VariableReference` is provided, it should be of the form `$variable` or `$variable->property`. If used above an assignment, Psalm checks whether the `VariableReference` matches the variable being assigned. If they differ, Psalm will assign the `Type` to `VariableReference` and use it in the expression below.
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If no `VariableReference` is given, the annotation tells Psalm that the RHS of the expression, whether an assignment or a return, is of type `Type`.
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If no `VariableReference` is given, the annotation tells Psalm that the right hand side of the expression, whether an assignment or a return, is of type `Type`.
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```php
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/** @var string */
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@ -54,7 +61,7 @@ There are a number of custom tags that determine how Psalm treats your code.
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### `@psalm-var`, `@psalm-param` and `@psalm-return`
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When specifying types in a format not supported phpDocumentor (but supported by Psalm) you may wish to prepend `@psalm-` to the PHPDoc tag, so as to avoid confusing your IDE. If a `@psalm`-prefixed tag is given, Psalm will use it in place of its non-prefixed counterpart.
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When specifying types in a format not supported phpDocumentor ([but supported by Psalm](#type-syntax)) you may wish to prepend `@psalm-` to the PHPDoc tag, so as to avoid confusing your IDE. If a `@psalm`-prefixed tag is given, Psalm will use it in place of its non-prefixed counterpart.
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### `@psalm-suppress SomeIssueName`
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@ -80,8 +87,6 @@ function addString(?string $s) {
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}
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```
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For example, we can suppress the possible
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### `@psalm-ignore-nullable-return`
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This can be used to tell Psalm not to worry if a function/method returns null. It’s a bit of a hack, but occasionally useful for scenarios where you either have a very high confidence of a non-null value, or some other function guarantees a non-null value for that particular code path.
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@ -137,7 +142,7 @@ function array_combine(array $arr, array $arr2) {}
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### `@psalm-seal-properties`
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If you have a magic property getter/setter, you can use `@psalm-seal-properties` to instruct Psalm to disallow getting and setting any properties not contained in a list of `@property(-read|-write)` annotations.
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If you have a magic property getter/setter, you can use `@psalm-seal-properties` to instruct Psalm to disallow getting and setting any properties not contained in a list of `@property` (or `@property-read`/`@property-write`) annotations.
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```php
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/**
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@ -155,7 +160,7 @@ class A {
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}
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$a = new A();
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$a->bar = 5;
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$a->bar = 5; // this call fails
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```
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## Type Syntax
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@ -196,7 +201,3 @@ function foo(array $arr): void {
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foo(["cool", 4]); // passes
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foo([4, "cool"]); // fails
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```
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