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<?php $a2 = array_diff(array(), array()); var_dump($a2); $a2[] = 'potato'; $a2[] = 'potato'; $a2[] = 'potato'; $a2[] = 'potato'; unset($a2[5], $a2[6], $a2[7], $a2[8]); $a3 = $a2; $a2[] = 'five'; var_dump($a2); $a3[] = 'jam'; var_dump($a3);
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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 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
array(0) { } array(5) { [0]=> string(6) "potato" [1]=> string(6) "potato" [2]=> string(6) "potato" [3]=> string(6) "potato" [4]=> string(4) "five" } array(5) { [0]=> string(6) "potato" [1]=> string(6) "potato" [2]=> string(6) "potato" [3]=> string(6) "potato" [4]=> string(3) "jam" }
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(0) { } array(5) { [0]=> string(6) "potato" [1]=> string(6) "potato" [2]=> string(6) "potato" [3]=> string(6) "potato" [4]=> string(4) "five" } array(5) { [0]=> string(6) "potato" [1]=> string(6) "potato" [2]=> string(6) "potato" [3]=> string(6) "potato" [4]=> string(3) "jam" }

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217.84 ms | 402 KiB | 357 Q