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@ 2018-04-10T22:59:39Z

<?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
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)

preferences:dark modelive previewkey bindings

26.91 ms | 404 KiB | 5 Q