按字母值排序多维PHP数组[重复]

Question

我的数组如下所示：

$colors[] = array("green", "dark green");
$colors[] = array("black", "black");
$colors[] = array("green", "light green");
$colors[] = array("blue", "dark blue");
$colors[] = array("blue", "light blue");
$colors[] = array("apricote", "apricote");

我需要按子数组的第一个值的字母升序对$colors 进行排序。 （绿色、蓝色、黑色、杏色）。

我知道如何使用usort 对数字进行排序，但对字母顺序一无所知。

结果会是这样的：

$colors[] = array("apricote", "apricote");
$colors[] = array("black", "black");
$colors[] = array("blue", "dark blue");
$colors[] = array("blue", "light blue");
$colors[] = array("green", "dark green");
$colors[] = array("green", "light green");

Answer 1

只使用sort()？像这样：

<?php

    $colors = array();
    $colors[] = array("green", "dark green");
    $colors[] = array("black", "black");
    $colors[] = array("green", "light green");
    $colors[] = array("blue", "dark blue");
    $colors[] = array("blue", "light blue");
    $colors[] = array("apricote", "apricote");

    sort($colors);

    print_r($colors);

?>

输出：

    Array
(
    [0] => Array
        (
            [0] => apricote
            [1] => apricote
        )

    [1] => Array
        (
            [0] => black
            [1] => black
        )

    [2] => Array
        (
            [0] => blue
            [1] => dark blue
        )

    [3] => Array
        (
            [0] => blue
            [1] => light blue
        )

    [4] => Array
        (
            [0] => green
            [1] => dark green
        )

    [5] => Array
        (
            [0] => green
            [1] => light green
        )

)