<?php
$re = '%^
((?=x))?
((?=y))?
(\w)
$%mx';
$str = 'x
y
z';
preg_match_all($re, $str, $matches, PREG_SET_ORDER | PREG_UNMATCHED_AS_NULL, 0);
// Print the entire match result
var_dump($matches);
- Output for 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
- array(3) {
[0]=>
array(4) {
[0]=>
string(1) "x"
[1]=>
string(0) ""
[2]=>
NULL
[3]=>
string(1) "x"
}
[1]=>
array(4) {
[0]=>
string(1) "y"
[1]=>
NULL
[2]=>
string(0) ""
[3]=>
string(1) "y"
}
[2]=>
array(4) {
[0]=>
string(1) "z"
[1]=>
NULL
[2]=>
NULL
[3]=>
string(1) "z"
}
}
- 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(3) {
[0]=>
array(4) {
[0]=>
string(1) "x"
[1]=>
string(0) ""
[2]=>
NULL
[3]=>
string(1) "x"
}
[1]=>
array(4) {
[0]=>
string(1) "y"
[1]=>
NULL
[2]=>
string(0) ""
[3]=>
string(1) "y"
}
[2]=>
array(4) {
[0]=>
string(1) "z"
[1]=>
NULL
[2]=>
NULL
[3]=>
string(1) "z"
}
}
- Output for 7.1.0 - 7.1.33
- Notice: Use of undefined constant PREG_UNMATCHED_AS_NULL - assumed 'PREG_UNMATCHED_AS_NULL' in /in/bu1Sf on line 13
Warning: A non-numeric value encountered in /in/bu1Sf on line 13
array(3) {
[0]=>
array(4) {
[0]=>
string(1) "x"
[1]=>
string(0) ""
[2]=>
string(0) ""
[3]=>
string(1) "x"
}
[1]=>
array(4) {
[0]=>
string(1) "y"
[1]=>
string(0) ""
[2]=>
string(0) ""
[3]=>
string(1) "y"
}
[2]=>
array(4) {
[0]=>
string(1) "z"
[1]=>
string(0) ""
[2]=>
string(0) ""
[3]=>
string(1) "z"
}
}
- Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
- Notice: Use of undefined constant PREG_UNMATCHED_AS_NULL - assumed 'PREG_UNMATCHED_AS_NULL' in /in/bu1Sf on line 13
array(3) {
[0]=>
array(4) {
[0]=>
string(1) "x"
[1]=>
string(0) ""
[2]=>
string(0) ""
[3]=>
string(1) "x"
}
[1]=>
array(4) {
[0]=>
string(1) "y"
[1]=>
string(0) ""
[2]=>
string(0) ""
[3]=>
string(1) "y"
}
[2]=>
array(4) {
[0]=>
string(1) "z"
[1]=>
string(0) ""
[2]=>
string(0) ""
[3]=>
string(1) "z"
}
}
preferences:
243.81 ms | 403 KiB | 291 Q