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How can I remove duplicate arrays in a multidimensional array?

This is my original array with [1] and [2] being identical.

$array = Array ( [0] => Array ( [0] => Walter [1] => White ) [1] => Array ( [0] => Marie [1] => Schrader ) [2] => Array ( [0] => Marie [1] => Schrader ) [3] => Array ( [0] => Hank [1] => Schrader ) )

What I like to achieve:

$array_without_duplicates = Array ( [0] => Array ( [0] => Walter [1] => White ) [1] => Array ( [0] => Marie [1] => Schrader ) [2] => Array ( [0] => Hank [1] => Schrader ) )
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3 Answers 3

Reset to default
3 
$results = array(); foreach ($array as $k => $v) { $results[implode($v)] = $v; } $results = array_values($results); print_r($results);

Demo

If you also want to consider keys when checking for equality, replace implode($v) with serialize($v).

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Comments

-2 
$i=0; foreach($arr as $key=>$val){ $i++; $j=0; foreach($arr as $key2=>$val2){ $j++; if($j<=$i){continue;} if($val===$val2){ unset($arr[$key2]); } } }
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Debug output: Array ( [0] => Array ( [0] => Walter [1] => White ) [1] => Array ( [0] => Marie [1] => Schrader ) [3] => Array ( [0] => Hank [1] => Schrader ) )
Plus: Notice: Undefined offset: 2
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You can get rid of duplicates using array_unique with SORT_REGULAR

$array = array_unique($array, SORT_REGULAR);
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works only on unidimensional array
This answer is provably correct and @vishwa's comment is provably incorrect. 3v4l.org/86Dqa This answer's advice is found on the canonical dupe target page.

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