Question

这是我的数组，我们称之为$arr

Array ( [0] => Array ( [post] => 159 [city] => Denver [country] => [state] => Colorado) 
        [1] => Array ( [post] => 165 [city] => Miami [country] => United States [state] => Florida ) 
        [2] => Array ( [post] => 172 [city] => East Rutherford [country] => United States [state] => New Jersey ) )

我想用键＃34; city＆＃34;来排序这个数组。按升序排列所以数组将是：

Array ( [0] => Array ( [post] => 159 [city] => Denver [country] => [state] => Colorado) 
        [2] => Array ( [post] => 172 [city] => East Rutherford [country] => United States [state] => New Jersey )
        [1] => Array ( [post] => 165 [city] => Miami [country] => United States [state] => Florida ) )

然后我想按状态键值按升序排序数组，所以它看起来像这样：

Array ( [0] => Array ( [post] => 159 [city] => Denver [country] => [state] => Colorado)
        [1] => Array ( [post] => 165 [city] => Miami [country] => United States [state] => Florida
        [2] => Array ( [post] => 172 [city] => East Rutherford [country] => United States [state] => New Jersey ) )

Answer 1

你需要使用带回调的usort。

usort ($array, function ($a, $b) {
    return (strcmp ($a ['city'], $b ['city']));
});

匿名函数仅在php 5.3起作用，所以万一你使用旧的东西将回调移动到一个新函数：

function my_array_sort_callback($a, $b) {
    return (strcmp ($a ['city'], $b ['city']))
}

usort ($array, "my_array_sort_callback");

Answer 2

检查array_multisort的示例＃3：http://www.php.net/manual/en/function.array-multisort.php

Answer 3

首先将数组存储在变量中然后运行循环

$fruits = array("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");
ksort($fruits);
foreach ($fruits as $key => $val) {
    echo "$key = $val\n";
}

输出将是 a =橙色 b =香蕉 c =苹果 d =柠檬

Answer 4

试试这个，假设$ arr是你的数组而不是

foreach($arr as $k=>$v):
ksort($v);
endforeach;

print_r($arr);

Answer 5

我会说答案在http://php.net/manual/en/function.array-multisort.php

Answer 6

这是一个解决您问题的解决方案：

<?php

$arr = array(
    array("posts"=>323, "city"=>"london"),
    array("posts"=>223, "city"=>"birmingham"),
    array("posts"=>255, "city"=>"norwich"),
    array("posts"=>13, "city"=>"manchester"),
    array("posts"=>23, "city"=>"liverpool"),
);

function cmp($a, $b) 
{
        return ($a["posts"] >= $b["posts"]);
}


usort($arr, "cmp");

print_r($arr);
?>

按键对PHP中的数组进行排序

6 个答案: