[Single topic]<?php$a=array (3=> "Horse",4=> "Dog");p Rint_r (Array_merge ($a));? >

2. Array ([0] = Horse [1] = Dog)
4. Array ([3] = Horse [4] = Dog)

Answer a

Instance

Combine two arrays into an array:

<?php$a1=array ("Red", "green"), $a 2=array ("Blue", "yellow");p Rint_r ( array_merge($a1,$a2) );? >

Running an instance

Definition and usage

The Array_merge () function merges one or more arrays into an array.

Tip: You can enter one or more arrays into the function.

Note: If two or more array elements have the same key name, the last element overrides the other element.

Note: If you enter an array only to the Array_merge () function, and the key name is an integer, the function returns a new array with an integer key name, with the key name re-indexed starting at 0 (see Example 1 below).

Tip: The difference between this function and the array_merge_recursive () function is that it handles two or more arrays of elements with the same key name. Array_merge_recursive () does not overwrite the key name, but instead recursively composes the values of multiple identical key names into an array.

Grammar

Array_merge (array1,array2,array3...)

Parameters	Description
Array1	Necessary. Specifies the array.
Array2	Optional. Specifies the array.
Array3	Optional. Specifies the array.

Technical details

return value:	Returns the merged array.
PHP version:	4 +
Update log:	Since PHP 5.0, this function only accepts parameters of the array type.

More examples of examples 1

Merge two associative arrays into an array:

<?php$a1=array ("A" and "Red", "B" and "green"), $a 2=array ("c" = "Blue", "b" = "yellow");p Rint_r ( array_merge($a1,$a2) ); >

Running an instance

Example 2

Use only one array parameter with an integer key name:

<?php$a=array (3=> "Red",4=> "green");p Rint_r ( array_merge($a) );? >

Running an instance

[Single topic]<?php$a=array (3=> "Horse",4=> "Dog");p Rint_r (Array_merge ($a));? >