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run code in 300+ PHP versions simultaneously
<?php $content = '<table></table><p></p><table></table><p></p><table></table><p></p>'; $counter = 0; echo preg_replace_callback('~<table\K>~', function() use (&$counter) { return ' class="table_' . $counter++ . '">'; }, $content);
Output for git.master, git.master_jit, rfc.property-hooks
<table class="table_0"></table><p></p><table class="table_1"></table><p></p><table class="table_2"></table><p></p>

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