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<?php $array = []; // Create empty array var_dump($array); echo "-----\n"; $array = ['abc']; // Assign the value ['abc'] (array with one element 0 => 'abc' to $array) var_dump($array); echo "-----\n"; $array[] = 'abc'; // Add a new element to the array 'abc' var_dump($array); echo "-----\n"; $array += [0 => 'NEWabc', 4 => 'anotherABC']; // Concats two arrays, but the key [0] is already existing in the left-handside array so it ignores the first value from the right hand side array and only adds the second element (key 4 is not existing) var_dump($array);
Output for 7.1.25, 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(1) { [0]=> string(3) "abc" } ----- array(2) { [0]=> string(3) "abc" [1]=> string(3) "abc" } ----- array(3) { [0]=> string(3) "abc" [1]=> string(3) "abc" [4]=> string(10) "anotherABC" }
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(1) { [0]=> string(3) "abc" } ----- array(2) { [0]=> string(3) "abc" [1]=> string(3) "abc" } ----- array(3) { [0]=> string(3) "abc" [1]=> string(3) "abc" [4]=> string(10) "anotherABC" }
preferences:
159.89 ms | 402 KiB | 152 Q