Can `array_unique` Be Used to Remove Duplicate Objects?

Can Array_unique Be Used with Objects?

Is there a function similar to the array_unique method that operates on objects? Imagine having multiple arrays containing 'Role' objects. You want to combine them and remove any duplicates.

Solution

Array_unique can be applied to an array of objects with the SORT_REGULAR constant:

<code class="php">class MyClass {
    public $prop;
}

$foo = new MyClass();
$foo->prop = 'test1';

$bar = $foo;

$bam = new MyClass();
$bam->prop = 'test2';

$test = array($foo, $bar, $bam);

print_r(array_unique($test, SORT_REGULAR));</code>

Output:

<code class="php">Array (
    [0] => MyClass Object
        (
            [prop] => test1
        )

    [2] => MyClass Object
        (
            [prop] => test2
        )
)</code>

Visit http://3v4l.org/VvonH#v529 for a live demonstration.

Caution: This method utilizes the "==" comparison rather than the strict comparison ("==="). So, when comparing objects within the array, it examines each object's properties rather than comparing object identities (instances).

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