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run code in 200+ php & hhvm versions
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<? $x = "jasldfns"; $i = strlen($x); echo preg_match('~[0-9a-zA-Z]{$i}~', $x); ?>
based on BnQC8
Output for 5.4.34 - 7.2.0
0
Output for 4.3.0 - 5.4.32
<? $x = "jasldfns"; $i = strlen($x); echo preg_match('~[0-9a-zA-Z]{$i}~', $x); ?>