@ 2014-02-21T18:07:51Z <?php
preg_match('/b(?<a>a)?/', 'xxxxbxaxxx', $matches);
var_dump($matches);
var_dump(array_key_exists('a', $matches));
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Output for 4.4.6 - 4.4.9 , 5.2.2 - 5.2.17 , 5.3.0 - 5.3.29 , 5.4.0 - 5.4.45 , 5.5.24 - 5.5.35 , 5.6.8 - 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 - 8.3.6 array(1) {
[0]=>
string(1) "b"
}
bool(false)
Output for 5.2.0 - 5.2.1 Warning: preg_match(): Compilation failed: unrecognized character after (?< at offset 4 in /in/tr5a0 on line 3
NULL
Warning: array_key_exists(): The second argument should be either an array or an object in /in/tr5a0 on line 7
bool(false)
Output for 4.3.11 , 4.4.0 - 4.4.5 , 5.0.0 - 5.0.5 , 5.1.0 - 5.1.6 Warning: preg_match(): Compilation failed: unrecognized character after (?< at offset 4 in /in/tr5a0 on line 3
array(0) {
}
bool(false)
Output for 4.3.0 - 4.3.10 Warning: Compilation failed: unrecognized character after (?< at offset 4 in /in/tr5a0 on line 3
array(0) {
}
bool(false)
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249.76 ms | 401 KiB | 343 Q