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<?php $arr = [ 0 => '"["Option 1", "Option 2", "Option 3"]"', 1 => '"["Option 1.1", "Option 1.2"]"' ]; foreach($arr as &$a) $a = json_decode(trim($a, '"'), true); var_dump($arr); var_dump([0=>array_merge(... $arr)]);
Output for 7.2.0 - 7.2.34, 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(2) { [0]=> array(3) { [0]=> string(8) "Option 1" [1]=> string(8) "Option 2" [2]=> string(8) "Option 3" } [1]=> &array(2) { [0]=> string(10) "Option 1.1" [1]=> string(10) "Option 1.2" } } array(1) { [0]=> array(5) { [0]=> string(8) "Option 1" [1]=> string(8) "Option 2" [2]=> string(8) "Option 3" [3]=> string(10) "Option 1.1" [4]=> string(10) "Option 1.2" } }
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(2) { [0]=> array(3) { [0]=> string(8) "Option 1" [1]=> string(8) "Option 2" [2]=> string(8) "Option 3" } [1]=> &array(2) { [0]=> string(10) "Option 1.1" [1]=> string(10) "Option 1.2" } } array(1) { [0]=> array(5) { [0]=> string(8) "Option 1" [1]=> string(8) "Option 2" [2]=> string(8) "Option 3" [3]=> string(10) "Option 1.1" [4]=> string(10) "Option 1.2" } }

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