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run code in 300+ PHP versions simultaneously
<?php $text = <<<TEXT # one # two a-two b-two c-two # three a-three b-three # four TEXT; echo preg_replace_callback( "~^#~m", function () { static $counter = 0; return ++$counter; }, $text );
Output for rfc.property-hooks, git.master, git.master_jit
1 one 2 two a-two b-two c-two 3 three a-three b-three 4 four

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