PHP array_reverse() 函数
PHP array_reverse() function
Instance
<?php
Return the array in the opposite order of elements:
$a=array("a"=>"Volvo","b"=>"BMW","c"=>"Toyota");print_r(array_reverse($a)
?>
);
Definition and Usage
The array_reverse() function returns the array in the opposite order of elements.
Description
The array_reverse() function reverses the order of elements in the original array, creates a new array, and returns it.
If the second parameter is specified as true, the element key names remain unchanged, otherwise the key names will be lost.
Syntaxarrayarray_reverse(preserve,
| ) | Description |
|---|---|
| array | Required. Specifies the array. |
| preserve |
Optional. Specifies whether to retain the original array key names. This parameter is a new addition in PHP 4.0.3. Possible Values:
|
Technical Details
| Return Value: | Return the reversed array. |
| PHP Version: | 4+ |
| Update Log: | Added in PHP 4.0.3 preserve Parameters. |
More Examples
Example 1
Return the original array, reverse the array, and return the reversed array with the original array key names:
<?php
$a=array("Volvo","XC90",array("BMW","Toyota"));
$reverse=array_reverse($a);
$preserve=array_reverse($a,true);
print_r($a);
print_r($reverse);
print_r($preserve);
?>
