Use the + operator or array_replace, this will preserve - somewhat - the keys: Strings which contain an integer will also be renumbered! I fell into this trap while merging two arrays with book ISBNs as keys. If you think you are smart and put your numbered keys into strings, this won't help. When they say "input arrays with numeric keys will be renumbered" they MEAN it. In addition to the text and Julian Egelstaffs comment regarding to keep the keys preserved with the + operator: In this case, the function will return an empty array. Starting from PHP 7.4.0, you can call the arraymerge() function without any arguments. Instead, it renumbers the numeric keys starting from zero in the result array.
#PHP ARRAY MERGE CODE#
The difference should be negligible for most applications, but I wanted to point this out for accuracy.īelow is the code used to test, along with the results: However, if the arraymerge() function will not overwrite the values with the same numeric keys. This is the case in both PHP 7.4 as well as PHP 8.0.
I wished to point out that while other comments state that the spread operator should be faster than array_merge, I have actually found the opposite to be true for normal arrays.
#PHP ARRAY MERGE ARCHIVE#
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