The array_merge merges/combine one or more arrays into one array.
Note: If the two or more arrays to be merged contain the same key, it is overridden by the last array key.
What is the syntax of the array_merge function?
array_merge(array1, array2, array3, ...)Parameter Values
| Parameter | Description |
|---|---|
| array1 | Specify the array to be merged – Required |
| array2 | Specify the array to be merged – Optional |
| array3,… | Specify the array to be merged – Optional |
Examples of array_merge function
<?php
$a1=array("red","green");
$a2=array("blue","yellow");
print_r(array_merge($a1,$a2));
?>In the above example, we merge two indexed arrays into one array using the array_merge function.
<?php
$a1=array("a"=>"1","b"=>"2");
$a2=array("c"=>"4","a"=>"3");
print_r(array_merge($a1,$a2));
?>In the above example, we merge two associative arrays into one array using the array_merge function. Note in the above example that we have the key “a” in both array 1 and array 2. The resultant array will contain the last array value that is “a” => 3.
<?php
$a=array(3=>"red",4=>"green");
print_r(array_merge($a));
?>In the above array, note that there is only one array given to the array_merge function. In this case, the function will create keys starting from 0 and increment them by 1 and assign them values from the given array.
