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run code in 150+ php & hhvm versions
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<?php $text = "matrixrate_matrixrate2_4"; echo strpos($text,'matrixrate_matrixrate'); echo str_replace('matrixrate_matrixrate_','',$text);
based on 6TpPF
Output for 4.3.0 - 7.1.0
0matrixrate_matrixrate2_4