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run code in 300+ PHP versions simultaneously
<?php $ar= array(); function ad($a=''){ if(is_int($a)){ $ar[] = $a.'int'; }else{ $ar[] = $a.'not'; } } ad(); ad(2); ad('2'); ad(2.5); ad(0); ad(1); print_r($ar);

preferences:
36.9 ms | 402 KiB | 5 Q