php根据字符串对数组进行排序

问题描述：

我有一个像这样的数组:

I have an array like this:

['ball', 'football', 'volleyball', 'football player', 'football league', 'tennis']

我想根据足球"关键字对它进行如下排序:

I want to sort it like the following based on "football" keyword:

['football', 'football player', 'football league', 'ball', 'volleyball', 'tennis']

我该如何实现?

答

您需要创建一个自定义排序函数，然后将其与usort.

You need to make a custom sort function, and then use it with usort.

$array=["ball","football","volleyball","football player","football league","tennis"];

function footsort($a,$b) {
    $afoot=substr($a,0,8)=="football";
    $bfoot=substr($b,0,8)=="football";
    if ($afoot==$bfoot) return strcmp($a,$b);
    /*else*/ 
    if ($afoot) return -1;
    if ($bfoot) return 1;
}

usort($array,"footsort");

print_r($array);

响应:

Array
(
    [0] => football
    [1] => football league
    [2] => football player
    [3] => ball
    [4] => tennis
    [5] => volleyball
)

php根据字符串对数组进行排序

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