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<?php $text = "01-3-567-90"; var_dump(strrpos($text, "-") , mb_strrpos($text, "-")); var_dump(strrpos($text, "-", 7) , mb_strrpos($text, "-", 7)); var_dump(strrpos($text, "-", -4), mb_strrpos($text, "-", -4));

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41.72 ms | 402 KiB | 5 Q