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<?php $res = array(); foreach ( range(0, 20) as $i ) { $res[$i % 10][] = $i; } var_dump($res);
Output for 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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(10) { [0]=> array(3) { [0]=> int(0) [1]=> int(10) [2]=> int(20) } [1]=> array(2) { [0]=> int(1) [1]=> int(11) } [2]=> array(2) { [0]=> int(2) [1]=> int(12) } [3]=> array(2) { [0]=> int(3) [1]=> int(13) } [4]=> array(2) { [0]=> int(4) [1]=> int(14) } [5]=> array(2) { [0]=> int(5) [1]=> int(15) } [6]=> array(2) { [0]=> int(6) [1]=> int(16) } [7]=> array(2) { [0]=> int(7) [1]=> int(17) } [8]=> array(2) { [0]=> int(8) [1]=> int(18) } [9]=> array(2) { [0]=> int(9) [1]=> int(19) } }
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(10) { [0]=> array(3) { [0]=> int(0) [1]=> int(10) [2]=> int(20) } [1]=> array(2) { [0]=> int(1) [1]=> int(11) } [2]=> array(2) { [0]=> int(2) [1]=> int(12) } [3]=> array(2) { [0]=> int(3) [1]=> int(13) } [4]=> array(2) { [0]=> int(4) [1]=> int(14) } [5]=> array(2) { [0]=> int(5) [1]=> int(15) } [6]=> array(2) { [0]=> int(6) [1]=> int(16) } [7]=> array(2) { [0]=> int(7) [1]=> int(17) } [8]=> array(2) { [0]=> int(8) [1]=> int(18) } [9]=> array(2) { [0]=> int(9) [1]=> int(19) } }

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