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<?php var_dump(preg_match('[0-9a-zA-Z]', 'bob', $matches), $matches); echo '---------', PHP_EOL; var_dump(preg_match('~[0-9a-zA-Z]~', 'bob', $matches), $matches); echo '---------', PHP_EOL; var_dump(preg_match('~[0-9a-zA-Z]+~', 'bob', $matches), $matches); ?>
Output for 4.3.10 - 4.3.11, 4.4.0 - 4.4.9, 5.0.2 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
int(0) array(0) { } --------- int(1) array(1) { [0]=> string(1) "b" } --------- int(1) array(1) { [0]=> string(3) "bob" }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 int(0) array(0) { } --------- int(1) array(1) { [0]=> string(1) "b" } --------- int(1) array(1) { [0]=> string(3) "bob" }
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.1
int(0) array(0) { } --------- Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/7a5H1 on line 6 PHP_EOLint(1) array(1) { [0]=> string(1) "b" } --------- Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/7a5H1 on line 8 PHP_EOLint(1) array(1) { [0]=> string(3) "bob" }

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230.97 ms | 406 KiB | 344 Q