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@ 2017-07-13T21:44:52Z

<?php

$arr = [
    'foo',
    'foo',
    'bar',
    'baz',
    'baz'
];

$arr2 = [];
foreach ($arr as $v) {
    $lower = mb_strtolower($v, 'utf-8');
    foreach ($arr2 as $v2) {
        $lower2 = mb_strtolower($v2, 'utf-8');
        if ($lower === $lower2) {
            continue 2;
        }
    }
    
    $arr2[] = $v;
}

var_dump($arr2);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
mb_strtolower: documentation ( source)

preferences:dark modelive preview

52.76 ms | 402 KiB | 5 Q