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php 数组这样的排序怎么做

Jun 06, 2016 pm 08:50 PM
php sort array

$a = array(
    '1' => 'one',
    '2' => 'two',
    '3' => 'three',
    '4' => 'four',
    '5' => 'five',
    ....
);

$b = array(2,5,4,1,3,.....); // 数组a的key顺序

$c = array(
    '2' => 'two',
    '5' => 'five',
    '4' => 'four',
    '1' => 'one',
    '3' => 'three',
    ....
);
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如何将数组a按照数组b值中key的顺序重新排序得到数组c?(可以不用循环么?)

回复内容:

$a = array(
    '1' => 'one',
    '2' => 'two',
    '3' => 'three',
    '4' => 'four',
    '5' => 'five',
    ....
);

$b = array(2,5,4,1,3,.....); // 数组a的key顺序

$c = array(
    '2' => 'two',
    '5' => 'five',
    '4' => 'four',
    '1' => 'one',
    '3' => 'three',
    ....
);
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如何将数组a按照数组b值中key的顺序重新排序得到数组c?(可以不用循环么?)

楼上的答案都是正确的 ... 不过不够帅 ... 我画蛇添足一下好了 ...

如果原数组的键值不是数字而是字符串的话 ... 这样的排序可以一行解决 ...

<?php /* the original array with string keys ... */
$src = [
    'a'   =>  'foo',
    'b'   =>  'bar',
    'c'   =>  'baz',
];

/* the order array ... */
$order = [ 'b', 'a', 'c' ];

/* sort using single line ... */
print_r( array_merge( array_flip( $order ), $src ) );
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但是 array_merge() 这个函数有个倒霉特性 ...

当原数组的键值整形化之后不为零的时候 ... 不论原来的键值是什么顺序都会被这个函数全部丢弃 ...

所以你的需求没办法用这种简单的方式解决 ... 只能借助于排序函数 ... 代码如下 ...

<?php /* the original array with integer keys ... */
$src = [
    '1'  =>  'foo',
    '2'   =>  'bar',
    '3'   =>  'baz',
];

/* the order array ... type is not important ... */
$order = [ 1, '3', 0b10 ];

/* get order weight ... */
$weight = array_flip( $order );

/* we do not want to change the source array order huh ..? */
$dst = $src;

/* 3 lines sorting ... not very difficult ... */
uksort( $dst, function( $left, $right ) use ( $weight ) {

    /* $left never equals to $right ... so 0 is impossible ... */ 
    return ( $weight[$left] <p>这种方式虽然写起来复杂 ... 但时间复杂度要低于楼上的整个遍历重生成新数组 ...</p><p>所以效率更高 ... 并且如果需要更改排序方式的话也更加灵活 ...</p><p>恩 ... 就是这样啦 ...</p>
                            
            <p class="answer fmt" data-id="1020000000185778">
                                    </p><pre class="brush:php;toolbar:false">$a = array(
    '1' => 'one',
    '2' => 'two',
    '3' => 'three',
    '4' => 'four',
    '5' => 'five',
    ....
);

$b = array(2,5,4,1,3,.....); // 数组a的key顺序

$c = array();

foreach( $b as $d ) $c[$d] = $a[$d];

print_r( $c );
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<code>$a = array(
    '1' => 'one',
    '2' => 'two',
    '3' => 'three',
    '4' => 'four',
    '5' => 'five'
);

$b = array('2','5','4','1','3'); // 数组a的key顺序


$result=array();

function sort_key($v){
    global $result;
    global $a;
    $result[$v]=$a[$v];
}

array_walk($b, 'sort_key');

print_r($result);

</code>
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闲着蛋疼写了一个...虽然已经时隔将近2年了...

代码写得矬,期待优雅代码。

$a = array(
    '1' => 'one',
    '2' => 'two',
    '3' => 'three',
    '4' => 'four',
    '5' => 'five',
    ...
);
$b = array(2, 5, 4, 1, 3, ...);
$c = array();

foreach ($b as $v) {
    $c[$v] = $a[$v];
}
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