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<?php var_dump(preg_match('#<(link)(\s[^>]*|)>#i', '<link>', $matches));var_dump($matches); var_dump(preg_match('#<(link)(\s[^>]*|)>#i', '<link/>', $matches));var_dump($matches); var_dump(preg_match('#<(link)(\s[^>]*|)>#i', '<link rel=test>', $matches));var_dump($matches); var_dump(preg_match('#<(link)(\s[^>]*)?>#i', '<link>', $matches));var_dump($matches); var_dump(preg_match('#<(link)(\s[^>]*)?>#i', '<link/>', $matches));var_dump($matches); var_dump(preg_match('#<(link)(\s[^>]*)?>#i', '<link rel=test>', $matches));var_dump($matches);
Output for 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(1) array(3) { [0]=> string(6) "<link>" [1]=> string(4) "link" [2]=> string(0) "" } int(0) array(0) { } int(1) array(3) { [0]=> string(15) "<link rel=test>" [1]=> string(4) "link" [2]=> string(9) " rel=test" } int(1) array(2) { [0]=> string(6) "<link>" [1]=> string(4) "link" } int(0) array(0) { } int(1) array(3) { [0]=> string(15) "<link rel=test>" [1]=> string(4) "link" [2]=> string(9) " rel=test" }
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(1) array(3) { [0]=> string(6) "<link>" [1]=> string(4) "link" [2]=> string(0) "" } int(0) array(0) { } int(1) array(3) { [0]=> string(15) "<link rel=test>" [1]=> string(4) "link" [2]=> string(9) " rel=test" } int(1) array(2) { [0]=> string(6) "<link>" [1]=> string(4) "link" } int(0) array(0) { } int(1) array(3) { [0]=> string(15) "<link rel=test>" [1]=> string(4) "link" [2]=> string(9) " rel=test" }

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184.9 ms | 403 KiB | 218 Q