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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 :)
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array_unique works by casting the elements to a string and doing a comparison. Unless your objects uniquely cast to strings, then they won't work with array_unique. Instead, implement a stateful comparison function for your objects and use array_filter to throw out things the function has already seen.
The array_diff() (manual) function can be used to find the difference between two arrays: $array1 = array(10, 20, 40, 80); $array2 = array(10, 20, 100, 200); $diff = array_diff($array1, $array2); // $diff = array(40, 80, 100, 200);
And a case-insensitive solution: $iArr = array_map('strtolower', $arr); $iArr = array_intersect($iArr, array_unique(array_diff_key($iArr, array_unique($iArr)))); array_intersect_key($arr, $iArr);
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).
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