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@ 2017-07-13T21:46:10Z

<?php

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

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

var_dump($arr2);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

37.74 ms | 402 KiB | 5 Q