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<?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) } }

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