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<?php // UNIT_MARKER_INVALID_CHARS = '_/\n<>'; echo $ic = preg_quote( '_/\n<>', '~'); var_dump( preg_match( "~[$ic]~", 'this-contains-letter-n' ) ); var_dump( preg_match( "~[$ic]~", 'this-comtaims-letter-m' ) ); var_dump( preg_match( "~[$ic]~", 'aaa' ) );
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.26, 8.2.0 - 8.2.13, 8.3.0
_/\\n\<\>int(1) int(0) int(0)
preferences:
133.66 ms | 403 KiB | 168 Q