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<?php preg_replace_callback( '#a#', function($matches) { var_dump($matches); }, 'aa' ); preg_replace_callback( '#(?<hello>a)#', function($matches) { var_dump($matches); }, 'aa' );
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 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 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
array(1) { [0]=> string(1) "a" } array(1) { [0]=> string(1) "a" } array(3) { [0]=> string(1) "a" ["hello"]=> string(1) "a" [1]=> string(1) "a" } array(3) { [0]=> string(1) "a" ["hello"]=> string(1) "a" [1]=> string(1) "a" }
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(1) { [0]=> string(1) "a" } array(1) { [0]=> string(1) "a" } array(3) { [0]=> string(1) "a" ["hello"]=> string(1) "a" [1]=> string(1) "a" } array(3) { [0]=> string(1) "a" ["hello"]=> string(1) "a" [1]=> string(1) "a" }
Output for 5.2.3 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/bDNbd on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.2
<br /> <b>Parse error</b>: syntax error, unexpected T_FUNCTION in <b>/in/bDNbd</b> on line <b>5</b><br />
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
<br /> <b>Parse error</b>: parse error, unexpected T_FUNCTION in <b>/in/bDNbd</b> on line <b>5</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.3.4
<br /> <b>Parse error</b>: parse error in <b>/in/bDNbd</b> on line <b>5</b><br />
Process exited with code 255.

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