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<?php $existing = array(1,2,3,4); $onForm = array(3,4,5,6); $removed = array_diff($existing,$onForm); $new = array_diff($onForm,$existing); $unchanged = array_intersect($existing,$onForm); echo 'existing'; print_r($existing); echo 'form'; print_r($onForm); echo 'removed'; print_r($removed); echo 'new'; print_r($new); echo 'unchanged'; print_r($unchanged);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 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 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
existingArray ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 ) formArray ( [0] => 3 [1] => 4 [2] => 5 [3] => 6 ) removedArray ( [0] => 1 [1] => 2 ) newArray ( [2] => 5 [3] => 6 ) unchangedArray ( [2] => 3 [3] => 4 )
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 existingArray ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 ) formArray ( [0] => 3 [1] => 4 [2] => 5 [3] => 6 ) removedArray ( [0] => 1 [1] => 2 ) newArray ( [2] => 5 [3] => 6 ) unchangedArray ( [2] => 3 [3] => 4 )

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