<?php
$test = [
[1,3,5],
[2,1,7],
[3,5,9],
[2,1,8]
];
$comparison = function ($a,$b) {
// sort by index 1 first
if($a[1] < $b[1]) return -1;
if($a[1] > $b[1]) return 1;
// if equal, sort by index 0
if($a[0] < $b[0]) return -1;
if($a[0] > $b[0]) return 1;
// otherwise sort by index 2
if($a[2] < $b[2]) return -1;
if($a[2] > $b[2]) return 1;
return 0;
};
usort($test,$comparison);
var_dump($test);
- Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.5 - 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(4) {
[0]=>
array(3) {
[0]=>
int(2)
[1]=>
int(1)
[2]=>
int(7)
}
[1]=>
array(3) {
[0]=>
int(2)
[1]=>
int(1)
[2]=>
int(8)
}
[2]=>
array(3) {
[0]=>
int(1)
[1]=>
int(3)
[2]=>
int(5)
}
[3]=>
array(3) {
[0]=>
int(3)
[1]=>
int(5)
[2]=>
int(9)
}
}
- 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(4) {
[0]=>
array(3) {
[0]=>
int(2)
[1]=>
int(1)
[2]=>
int(7)
}
[1]=>
array(3) {
[0]=>
int(2)
[1]=>
int(1)
[2]=>
int(8)
}
[2]=>
array(3) {
[0]=>
int(1)
[1]=>
int(3)
[2]=>
int(5)
}
[3]=>
array(3) {
[0]=>
int(3)
[1]=>
int(5)
[2]=>
int(9)
}
}
preferences:
194 ms | 402 KiB | 200 Q