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<?php preg_match("/^(?<NAME_A>aaa)(?:(?<NAME_B>x)?)/", "aaay", $matches, PREG_UNMATCHED_AS_NULL); var_dump($matches);
Output for 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
array(5) { [0]=> string(3) "aaa" ["NAME_A"]=> string(3) "aaa" [1]=> string(3) "aaa" ["NAME_B"]=> NULL [2]=> NULL }
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 array(5) { [0]=> string(3) "aaa" ["NAME_A"]=> string(3) "aaa" [1]=> string(3) "aaa" ["NAME_B"]=> NULL [2]=> NULL }
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
array(3) { [0]=> string(3) "aaa" ["NAME_A"]=> string(3) "aaa" [1]=> string(3) "aaa" }
Output for 7.1.0 - 7.1.20
Notice: Use of undefined constant PREG_UNMATCHED_AS_NULL - assumed 'PREG_UNMATCHED_AS_NULL' in /in/em6fi on line 3 Warning: preg_match() expects parameter 4 to be integer, string given in /in/em6fi on line 3 NULL

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151.75 ms | 402 KiB | 161 Q