3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = '' $regx = "(\d)(?=(\d{3})+$)"; $string = '919191911'; $pattern = '(\\d)(?=(\\d{3})+$)'; $replacement = '$1$4 $2$3$5'; echo preg_replace($pattern, $replacement, $string);
Output for 5.4.0 - 5.4.27
Parse error: syntax error, unexpected '$regx' (T_VARIABLE) in /in/CSsSm on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_VARIABLE in /in/CSsSm on line 5
Process exited with code 255.
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183.19 ms | 1395 KiB | 64 Q