3v4l.org

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<?php $testString = "\\;\\3;4;5"; $digits = preg_replace("/[^0-9]/", "", $testString); $arr = str_split($digits,1); $string = implode(',',$arr); echo $string; ?>
Output for 7.1.0 - 7.1.21, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
3,4,5

preferences:
169.7 ms | 407 KiB | 5 Q