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run code in 300+ PHP versions simultaneously
<?php $x = 0; $a = &$x; $x++; echo 'x=', $x, ' a=', $a, '\n'; $a++; echo 'x=', $x, ' a=', $a, '\n';
Output for git.master, git.master_jit, rfc.property-hooks
x=1 a=1\nx=2 a=2\n

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