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<?php $arr1 = array(1, 2, 3, 4); $arr2 = array("a" => array(1, 2, 3)); $arr3 = array(); print_r(array_merge_recursive($arr3, $arr1, $arr2, $arr5));
Output for 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
Warning: Undefined variable $arr5 in /in/Vu0As on line 7 Fatal error: Uncaught TypeError: array_merge_recursive(): Argument #4 must be of type array, null given in /in/Vu0As:7 Stack trace: #0 /in/Vu0As(7): array_merge_recursive(Array, Array, Array, NULL) #1 {main} thrown in /in/Vu0As on line 7
Process exited with code 255.
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 Warning: Undefined variable $arr5 in /in/Vu0As on line 7 Fatal error: Uncaught TypeError: array_merge_recursive(): Argument #4 must be of type array, null given in /in/Vu0As:7 Stack trace: #0 /in/Vu0As(7): array_merge_recursive(Array, Array, Array, NULL) #1 {main} thrown in /in/Vu0As on line 7
Process exited with code 255.
Output for 7.3.24 - 7.3.31, 7.4.12 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined variable: arr5 in /in/Vu0As on line 7 Warning: array_merge_recursive(): Expected parameter 4 to be an array, null given in /in/Vu0As on line 7
Output for 7.3.32 - 7.3.33, 7.4.26
Warning: array_merge_recursive(): Expected parameter 4 to be an array, null given in /in/Vu0As on line 7

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