php 二维数组排序 array_multisort
对2维数组或者多维数组排序是常见的问题,在php中我们有个专门的多维数组排序函数,下面简单介绍下:
array_multisort(array1,sorting order, sorting type,array2,array3..)是对多个数组或多维数组进行排序的函数。
array1 | 必需。规定输入的数组。 |
sorting order | 可选。规定排列顺序。可能的值是 SORT_ASC 和 SORT_DESC。 |
sorting type | 可选。规定排序类型。可能的值是SORT_REGULAR、SORT_NUMERIC和SORT_STRING。 |
array2 | 可选。规定输入的数组。 |
array3 | 可选。规定输入的数组。 |
参数中的数组被当成一个表的列并以行来进行排序 - 这类似 SQL 的 ORDER BY 子句的功能。第一个数组是要排序的主要数组。数组中的行(值)比较为相同的话,就会按照下一个输入数组中相应值的大小进行排序,依此类推。
第一个参数是数组,随后的每一个参数可能是数组,也可能是下面的排序顺序标志(排序标志用于更改默认的排列顺序)之一:
随后可以指定排序的类型:
<?php function my_sort($arrays,$sort_key,$sort_order=SORT_ASC,$sort_type=SORT_NUMERIC ){ if(is_array($arrays)){ foreach ($arrays as $array){ if(is_array($array)){ $key_arrays[] = $array[$sort_key]; }else{ return false; } } }else{ return false; } array_multisort($key_arrays,$sort_order,$sort_type,$arrays); return $arrays; } $person = array( array('id'=>1,'name'=>'fj','weight'=>100,'height'=>180), array('id'=>2,'name'=>'tom','weight'=>53,'height'=>150), array('id'=>3,'name'=>'jerry','weight'=>120,'height'=>156), array('id'=>4,'name'=>'bill','weight'=>110,'height'=>190), array('id'=>5,'name'=>'linken','weight'=>80,'height'=>200), array('id'=>6,'name'=>'madana','weight'=>95,'height'=>110), array('id'=>7,'name'=>'jordan','weight'=>70,'height'=>170) ); var_dump($person); $person = my_sort($person,'name',SORT_ASC,SORT_STRING); var_dump($person); $person = my_sort($person,'weight'); var_dump($person);?>
结果如下:
<strong>array</strong> (size=7) 0 => <strong>array</strong> (size=4) 'id' => int 1 'name' => string 'fj' (length=2) 'weight' => int 100 'height' => int 180 1 => <strong>array</strong> (size=4) 'id' => int 2 'name' => string 'tom' (length=3) 'weight' => int 53 'height' => int 150 2 => <strong>array</strong> (size=4) 'id' => int 3 'name' => string 'jerry' (length=5) 'weight' => int 120 'height' => int 156 3 => <strong>array</strong> (size=4) 'id' => int 4 'name' => string 'bill' (length=4) 'weight' => int 110 'height' => int 190 4 => <strong>array</strong> (size=4) 'id' => int 5 'name' => string 'linken' (length=6) 'weight' => int 80 'height' => int 200 5 => <strong>array</strong> (size=4) 'id' => int 6 'name' => string 'madana' (length=6) 'weight' => int 95 'height' => int 110 6 => <strong>array</strong> (size=4) 'id' => int 7 'name' => string 'jordan' (length=6) 'weight' => int 70 'height' => int 170
<strong>array</strong> (size=7) 0 => <strong>array</strong> (size=4) 'id' => int 4 'name' => string 'bill' (length=4) 'weight' => int 110 'height' => int 190 1 => <strong>array</strong> (size=4) 'id' => int 1 'name' => string 'fj' (length=2) 'weight' => int 100 'height' => int 180 2 => <strong>array</strong> (size=4) 'id' => int 3 'name' => string 'jerry' (length=5) 'weight' => int 120 'height' => int 156 3 => <strong>array</strong> (size=4) 'id' => int 7 'name' => string 'jordan' (length=6) 'weight' => int 70 'height' => int 170 4 => <strong>array</strong> (size=4) 'id' => int 5 'name' => string 'linken' (length=6) 'weight' => int 80 'height' => int 200 5 => <strong>array</strong> (size=4) 'id' => int 6 'name' => string 'madana' (length=6) 'weight' => int 95 'height' => int 110 6 => <strong>array</strong> (size=4) 'id' => int 2 'name' => string 'tom' (length=3) 'weight' => int 53 'height' => int 150
<strong>array</strong> (size=7) 0 => <strong>array</strong> (size=4) 'id' => int 2 'name' => string 'tom' (length=3) 'weight' => int 53 'height' => int 150 1 => <strong>array</strong> (size=4) 'id' => int 7 'name' => string 'jordan' (length=6) 'weight' => int 70 'height' => int 170 2 => <strong>array</strong> (size=4) 'id' => int 5 'name' => string 'linken' (length=6) 'weight' => int 80 'height' => int 200 3 => <strong>array</strong> (size=4) 'id' => int 6 'name' => string 'madana' (length=6) 'weight' => int 95 'height' => int 110 4 => <strong>array</strong> (size=4) 'id' => int 1 'name' => string 'fj' (length=2) 'weight' => int 100 'height' => int 180 5 => <strong>array</strong> (size=4) 'id' => int 4 'name' => string 'bill' (length=4) 'weight' => int 110 'height' => int 190 6 => <strong>array</strong> (size=4) 'id' => int 3 'name' => string 'jerry' (length=5) 'weight' => int 120 'height' => int 156
这里的重点就是,先把要排序的key存到一个一维数组中,然后就可以使用array_multisort()这个函数,将数组按照key进行排序了,当然,这里的排序你完全可以不适用array_multisort()这个函数,仅仅通过foreach遍历也能达到这个效果,但是既然php开发者给我们提供了更好的办法,我们就可以省去不必要的麻烦了。

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