PHP根据数组中的索引对数组数组进行排序 [英] PHP sort an array of arrays according to an index in the arrays

问题描述

假设您有一个看起来像这样的数组:

Let's say you have an array that looks like this:

$myArray []= array('firstname' => 'John' , 'lastname'=> 'Johnson');

$myArray []= array('firstname' => 'Adam' , 'lastname'=> 'Tyson');

$myArray []= array('firstname' => 'Mike' , 'lastname'=> 'Robinson');

$myArray []= array('firstname' => 'David' , 'lastname'=> 'Jackson');

如何根据姓对$ myArray排序?

How can you sort $myArray according to the lastname?

推荐答案

这也有效

<?php
    $myArray []= array('firstname' => 'John' , 'lastname'=> 'Johnson');
    $myArray []= array('firstname' => 'Adam' , 'lastname'=> 'Tyson');
    $myArray []= array('firstname' => 'Mike' , 'lastname'=> 'Robinson');
    $myArray []= array('firstname' => 'David' , 'lastname'=> 'Jackson');

    foreach ($myArray as $array) {
        $lastnames[] = $array['lastname'];
    }

    array_multisort($lastnames,SORT_STRING,$myArray);
    echo '<pre>',print_r($myArray,1),'</pre>';

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