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@ 2016-08-21T04:02:42Z

<?php

$a = [1, 2, 4];
for ($i = 1; $i <= 4; $i++) { 
    echo $i.'. '.(in_array($i, $a) ? 'true' : 'false').PHP_EOL; 
}

Output
Performance
VLD
References
Branches

in_array: documentation ( source)

preferences:dark modelive previewkey bindings

45.2 ms | 1565 KiB | 5 Q