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# sort

(PHP 3, PHP 4 , PHP 5)

sort -- Sort an array

## Description

bool sort ( array &array [, int sort_flags])

This function sorts an array. Elements will be arranged from lowest to highest when this function has completed.

> 備注: This function assigns new keys for the elements in array. It will remove any existing keys you may have assigned, rather than just reordering the keys.

成功回傳`TRUE`失敗回傳`FALSE`。

示範 1.sort() example

`<?php $fruits = array("lemon", "orange", "banana", "apple"); sort($fruits); reset($fruits); while (list($key, $val) = each($fruits)) { echo "fruits[" . $key . "] = " . $val . "\n"; } ?>`

This example would display:

    fruits[0] = apple
    fruits[1] = banana
    fruits[2] = lemon
    fruits[3] = orange

The fruits have been sorted in alphabetical order.

The optional second parameter sort_flags may be used to modify the sorting behavior using these values:

Sorting type flags:

- `SORT_REGULAR` - compare items normally

- `SORT_NUMERIC` - compare items numerically

- `SORT_STRING` - compare items as strings

> 備注: The second parameter was added in PHP 4.

切記!
Be carefull when sorting arrays with mixed types values because sort() can produce unpredictable results.

See also arsort(), asort(), ksort(), natsort(), natcasesort(), rsort(), usort(), array_multisort(), and uksort().

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