PHP array_merge() 函数
实例
把两个数组合并为一个数组：
<?php
$a1=array("red","green");
$a2=array("blue","yellow");
print_r(array_merge($a1,$a2));
?>
定义和用法
array_merge() 函数把一个或多个数组合并为一个数组。
Tip:您可以向函数输入一个或者多个数组。
Comment:If two or more array elements have the same key name, the last element will overwrite the other elements.
Comment:If you only input an array to the array_merge() function and the key name is an integer, then this function will return a new array with integer keys, re-indexed starting from 0 (see the example below 1).
Tip:This function is similar to array_merge_recursive() The difference between functions is in handling the case where two or more array elements have the same key name. array_merge_recursive() does not perform key name overwrite, but recursively forms an array of values with the same key name.
Syntax
array_merge(array1,array2,array3...)
| Parameter | Description |
|---|---|
| array1 | Required. Specify array. |
| array2 | Optional. Specify array. |
| array3 | Optional. Specify array. |
Technical Details
| Return Value: | Return merged array. |
| PHP Version: | 4+ |
| Update Log: | Starting from PHP 5.0, this function only accepts array type parameters. |
More Examples
Example 1
Merge two associative arrays into one array:
<?php
$a1=array("a"=>"red","b"=>"green");
$a2=array("c"=>"blue","b"=>"yellow");
print_r(array_merge($a1,$a2));
?>
Example 2
Use only one array parameter with integer keys:
<?php $a=array(3=>"red",4=>"green"); print_r(array_merge($a)); ?>
