PHP array_merge_recursive() Function

Complete PHP Array Reference

Definition and Usage

The array_merge_recursive() function merges one ore more arrays into one array.

The difference between this function and the array_merge() function is when two or more array elements have the same key. Instead of override the keys, the array_merge_recursivse() function makes the value as an array.

Syntax

array_merge_recursive(array1,array2,array3...)

Parameter Description
array1 Required. Specifies an array
array2 Optional. Specifies an array
array3 Optional. Specifies an array

Tips and Notes

Note: If you assign only one array to the array_merge_recursive() function, it will behave exactly the same as the array_merge() function.

Example

<?php
$a1=array("a"=>"Horse","b"=>"Dog");
$a2=array("c"=>"Cow","b"=>"Cat");
print_r(array_merge_recursive($a1,$a2));
?>

The output of the code above will be:

Array (
[a] => Horse
[b] => Array ( [0] => Dog [1] => Cat )
[c] => Cow
)

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