1.2.1640. preg_match_all() Flag¶
preg_match_all() has an option to configure the structure of the results : it is either by capturing parenthesis (by default), or by result sets.
The second option is the most interesting when the following foreach() loop has to manipulate several captured strings at the same time. No need to use an index in the first array and use it in the other arrays. The second syntax is easier to read and may be marginally faster to execute (preg_match_all() and foreach()).
<?php
$string = 'ababab';
// default behavior
preg_match_all('/(a)(b)/', $string, $r);
$found = '';
foreach($r[1] as $id => $s) {
$found .= $s.$r[2][$id];
}
// better behavior
preg_match_all('/(a)(b)/', $string, $r, PREG_SET_ORDER);
$found = '';
foreach($r as $s) {
$found .= $s[1].$s[2];
}
?>
1.2.1640.1. Suggestions¶
Use flags to adapt the results of preg_match_all() to your code, not the contrary.
1.2.1640.2. Specs¶
Short name |
Php/PregMatchAllFlag |
Rulesets |
|
Exakat since |
0.8.4 |
PHP Version |
All |
Severity |
Minor |
Time To Fix |
Quick (30 mins) |
Precision |
Very high |
Examples |
|
Available in |