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@ 2022-03-22T12:22:26Z

<?php

function inc(&$item) {
    $item++;
}

$a = [];
inc($a['unknown']);
print_r($a);

Output
Performance
VLD
References
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print_r: documentation ( source)

preferences:dark modelive previewkey bindings

41.39 ms | 854 KiB | 5 Q