3v4l.org

run code in 300+ PHP versions simultaneously
<?php $ref = "PHP 5"; $x = $ref; echo "$x\n"; $x++; echo "$x\n"; $x = $ref; echo "$x\n"; $x = ++$x; echo "$x\n";
Output for git.master, git.master_jit, rfc.property-hooks
PHP 5 PHP 6 PHP 5 PHP 6

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