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<?php $arr=array('0_1','0_3','1_2','1_1','4_1'); $newArray = []; foreach ($arr as $item) { $items = explode('_', $item); $newArray[$items[0]][$items[1]] = $item; } var_dump($newArray); exit();
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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(2) { [1]=> string(3) "0_1" [3]=> string(3) "0_3" } [1]=> array(2) { [2]=> string(3) "1_2" [1]=> string(3) "1_1" } [4]=> array(1) { [1]=> string(3) "4_1" } }
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(2) { [1]=> string(3) "0_1" [3]=> string(3) "0_3" } [1]=> array(2) { [2]=> string(3) "1_2" [1]=> string(3) "1_1" } [4]=> array(1) { [1]=> string(3) "4_1" } }

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