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@ 2019-12-17T12:40:23Z

<?php

$a = array(0 , 0 , 0 , 0);
$b = array_unique($a);
if(count($b) === 0 || count($b) > 1 || $b[0] !== 0){
    echo "No";
}else{
    echo "All Zero";
}

Output
Performance
VLD
References
Branches

array_unique: documentation ( source)

preferences:dark modelive previewkey bindings

43.04 ms | 1470 KiB | 5 Q