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run code in 300+ PHP versions simultaneously
<?php function check($value) { if ($value != "") { echo 'is not an empty string'; } else if ($value == '') { echo 'is an empty string'; } else { echo 'SOMETHING ELSE'; } } foreach(array( '', 0, false, true, null, -1, array(), 1, '0', '1' ) as $value) { echo trim(var_export($value, true)), ': ', check($value), "\n"; }

preferences:
54.03 ms | 402 KiB | 5 Q