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<?php $array = array('a' => array(1, 2, 3, 4, 5), 'b' => array(6,7,8,9,10)); $ref = &$array; foreach ($array['a'] as $val) { var_dump($val); $array['a'][2] = 0; } var_dump($ref); var_dump($array);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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
int(1) int(2) int(3) int(4) int(5) array(2) { ["a"]=> array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(0) [3]=> int(4) [4]=> int(5) } ["b"]=> array(5) { [0]=> int(6) [1]=> int(7) [2]=> int(8) [3]=> int(9) [4]=> int(10) } } array(2) { ["a"]=> array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(0) [3]=> int(4) [4]=> int(5) } ["b"]=> array(5) { [0]=> int(6) [1]=> int(7) [2]=> int(8) [3]=> int(9) [4]=> int(10) } }
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 int(1) int(2) int(3) int(4) int(5) array(2) { ["a"]=> array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(0) [3]=> int(4) [4]=> int(5) } ["b"]=> array(5) { [0]=> int(6) [1]=> int(7) [2]=> int(8) [3]=> int(9) [4]=> int(10) } } array(2) { ["a"]=> array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(0) [3]=> int(4) [4]=> int(5) } ["b"]=> array(5) { [0]=> int(6) [1]=> int(7) [2]=> int(8) [3]=> int(9) [4]=> int(10) } }

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