array_merge() merges the elements of two or more arrays together so that the values of one are appended to the end of the previous one. It returns the resulting array.
If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the arrays have the same numeric key, the later value will not overwrite the original value, but will be appended.
Example 1. array_merge() example
The $result will be:
See also array_merge_recursive().