array_unique for objects?

Question

Is there any method like the array_unique for objects? I have a bunch of arrays with 'Role' objects that I merge, and then I want to take out the duplicates :)

Answer 1

array_unique works with an array of objects using SORT_REGULAR:

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)); 

Will print:

Array (     [0] => MyClass Object         (             [prop] => test1         )      [2] => MyClass Object         (             [prop] => test2         ) ) 

See it in action here: http://3v4l.org/VvonH#v529

Warning: it will use the "==" comparison, not the strict comparison ("===").

So if you want to remove duplicates inside an array of objects, beware that it will compare each object properties, not compare object identity (instance).