How Can I Specify Array Types of Objects in PHPDoc Annotations?

Array Typing in PHPDoc for Object Collections

In PHPDoc annotations, the @var tag indicates the data type of member variables for IDE autocompletion. However, extending this functionality to arrays of objects poses a challenge.

The Need for Array Typing

Consider the following code, where $someObjInstance is an array of SomeObj objects:

/** @var SomeObj */
private $someObjInstance;

This annotation is insufficient for IDE support when iterating over the array.

Valid Syntax for Array Typing

To specify an array of objects in PHPDoc, use the following syntax:

/** @var SomeObj[] */
private $someObjInstance;

This syntax informs the IDE that $someObjInstance is an array containing instances of the SomeObj class.

PHPDoc Documentation Recommendation

The official PHPDoc documentation suggests using a single type within the square brackets to specify the type of each array element:

/** @var int[] */
private $integerArray;

This ensures that each element in the array is of the specified type.

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