array_merge_recursive

Definition and usage

The array_merge_recursive() function combines one or more arrays into an array.

The difference between this function and array_merge() function is that when two or more array elements have the same key name. array_merge_recursive() does not overwrite key names, but recursively combines multiple values ​​of the same key names into an array.

Note: If you just enter an array to the array_merge_recursive() function and the result is the same as array_merge() , the function returns a new array with integer key names whose key names start with 0.

Example

Combine two arrays into an array:

 <?php
$a1 = array ( "a" => "red" , "b" => "green" ) ;
$a2 = array ( "c" => "blue" , ​​"b" => "yellow" ) ;
print_r ( array_merge_recursive ( $a1 , $a2 ) ) ;
?>

Try it yourself

grammar

 array_merge_recursive ( array1 , array2 , array3 ... )