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@ 2022-02-07T13:58:17Z

<?php

$arrOne = [1, 3, 4];
$arrTwo = [2, 5];
$newArr = [];
foreach($arrOne as $key => $one) {
    switch($key) {
        case 1: 
            $newArr[] = $arrTwo[0];
            break;
        case 4: 
            $newArr[] = $arrTwo[1];
            break;
    }
    $newArr[] = $one;
}
if(count($newArr, 1) < 5) {
    $newArr[] = $arrTwo[1];
}

print_r($newArr);

Output
Performance
VLD
References
Branches

count: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive previewkey bindings

96.82 ms | 1274 KiB | 5 Q