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<?php $alpha = 'aabbccddeeffgghhiijjkk'; $alphaArray = str_split($alpha); $uniqArray = array_unique($alphaArray); $diff = array_diff_assoc($alphaArray, $uniqArray); var_dump($diff);
Output for 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(11) { [1]=> string(1) "a" [3]=> string(1) "b" [5]=> string(1) "c" [7]=> string(1) "d" [9]=> string(1) "e" [11]=> string(1) "f" [13]=> string(1) "g" [15]=> string(1) "h" [17]=> string(1) "i" [19]=> string(1) "j" [21]=> string(1) "k" }
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(11) { [1]=> string(1) "a" [3]=> string(1) "b" [5]=> string(1) "c" [7]=> string(1) "d" [9]=> string(1) "e" [11]=> string(1) "f" [13]=> string(1) "g" [15]=> string(1) "h" [17]=> string(1) "i" [19]=> string(1) "j" [21]=> string(1) "k" }

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