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<?php var_dump(preg_replace("#1#\x00#i", "2", "1"));
Output for 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: preg_replace(): NUL is not a valid modifier in /in/5lacp on line 3 NULL
Output for 5.4.7 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27
Warning: preg_replace(): Null byte in regex in /in/5lacp on line 3 NULL
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.6
string(1) "2"

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211.32 ms | 403 KiB | 310 Q