<?php
echo "Normal match:\n";
preg_match('/two/', 'two', $match, PREG_UNMATCHED_AS_NULL);
var_dump($match);
echo "Unmatched $1 is always reported as null:\n";
preg_match('/(one)?two/', 'two', $match, PREG_UNMATCHED_AS_NULL);
var_dump($match);
preg_match('/two(three)?/', 'two', $match, PREG_UNMATCHED_AS_NULL);
var_dump($match);
preg_match('/(one)?(two)/', 'two', $match, PREG_UNMATCHED_AS_NULL);
var_dump($match);
echo "Unmatched $2 is also reported as null:\n";
preg_match('/(two)(three)?/', 'two', $match, PREG_UNMATCHED_AS_NULL);
var_dump($match);
- Output for 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
- Normal match:
array(1) {
[0]=>
string(3) "two"
}
Unmatched $1 is always reported as null:
array(2) {
[0]=>
string(3) "two"
[1]=>
NULL
}
array(2) {
[0]=>
string(3) "two"
[1]=>
NULL
}
array(3) {
[0]=>
string(3) "two"
[1]=>
NULL
[2]=>
string(3) "two"
}
Unmatched $2 is also reported as null:
array(3) {
[0]=>
string(3) "two"
[1]=>
string(3) "two"
[2]=>
NULL
}
- 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
Normal match:
array(1) {
[0]=>
string(3) "two"
}
Unmatched $1 is always reported as null:
array(2) {
[0]=>
string(3) "two"
[1]=>
NULL
}
array(2) {
[0]=>
string(3) "two"
[1]=>
NULL
}
array(3) {
[0]=>
string(3) "two"
[1]=>
NULL
[2]=>
string(3) "two"
}
Unmatched $2 is also reported as null:
array(3) {
[0]=>
string(3) "two"
[1]=>
string(3) "two"
[2]=>
NULL
}
- Output for 7.3.0 - 7.3.33
- Normal match:
array(1) {
[0]=>
string(3) "two"
}
Unmatched $1 is always reported as null:
array(1) {
[0]=>
string(3) "two"
}
array(1) {
[0]=>
string(3) "two"
}
array(3) {
[0]=>
string(3) "two"
[1]=>
NULL
[2]=>
string(3) "two"
}
Unmatched $2 is also reported as null:
array(2) {
[0]=>
string(3) "two"
[1]=>
string(3) "two"
}
preferences:
151.55 ms | 402 KiB | 156 Q