How PHP sorts a key value for a multidimensional array

PHP multidimensional array sorting can be handled using the Array_multisort () function, which can be used to sort multiple arrays at once, or to sort multidimensional arrays based on one dimension or multidimensional, and the associated (string) key name remains unchanged. But the number key name will be indexed again

Sort order Flags:

Sort_asc-Sort by ascending order

Sort_desc-Sort in descending order

Sort Type Flags:

Sort_regular-Compare items in the usual way

Sort_numeric-Compare items by numerical comparison

Sort_string-Comparing items by string

Example 1. Sort on multiple arrays

The code is as follows
<?php $ar 1 = Array ("a"); $ar 2 = Array (1, 3, "2", 1); Array_multisort ($ar 1, $ar 2); Var_dump ($ar 1); Var_dump ($ar 2); ?>

After sorting in this example, the first array will contain "ten", "a", 100,100. The second array will contain 1, 1, "2", and 3. The sequence of items in the second array is exactly the same as the corresponding items in the first array (100 and 100).

But these can not be specified by the key value ranking, I have sorted out a few function algorithms are good.

Sample code

The code is as follows

/** * Sort multiple-bit arrays * @param $multi _array Array * @param $sort _key need to pass in the key name * @param $sort Sort Type */ function Multi_array_sort ($multi _array, $sort _key, $sort = Sort_desc) { if (Is_array ($multi _array)) { foreach ($multi _array as $row _array) { if (Is_array ($row _array)) { $key _array[] = $row _array[$sort _key]; } else { return FALSE; } } } else { return FALSE; } Array_multisort ($key _array, $sort, $multi _array); return $multi _array; }

Example Two

The code is as follows
function Array_sort ($arr, $keys, $type = ' asc ') { $keysvalue = $new _array = Array (); foreach ($arr as $k => $v) { $keysvalue [$k] = $v [$keys]; } if ($type = = ' asc ') { Asort ($keysvalue); } else { Arsort ($keysvalue); } Reset ($keysvalue); foreach ($keysvalue as $k => $v) { $new _array[] = $arr [$k]; } return $new _array; }

Example 3

code is as follows

&nbs P;

/* Function: Two-dimensional array sorted by specified key value author:www.111cn.net */ F Unction Array_sort ($array, $keys, $type = ' asc ') { if!isset ($array) | |!is_array ($array) | | empty ($array)) { Return "; } if (!isset ($keys) | | | trim ($keys) = = ') { return '; } if (!isset ($type) | | | $type = = ' | |!in_array (strtolower ($type), Array (' ASC ', ' desc ')) { return '; } $keysvalue =array (); foreach ($array as $key => $val) { $val [$keys] = Str_replace ('-', ', ', $val [$keys]); $val [$keys] = Str_replace (', ', $val [$keys]); $val [$keys] = Str_replace (': ', ', $val [$keys]); $keysvalue [] = $val [$keys]; } Asort ($keysvalue);//key value sort Reset ($keysvalue);//pointer points to array first foreach ($keysvalue as $key => $vals) { $keysort [] = $key; } $keysvalue = Array (); $count =count ($keysorT); if (Strtolower ($type)!= ' ASC ') { for ($i = $count-1; $i >=0; $i-) { $keysvalue [] = $array [$keysort [$i]]; }else{ for ($i =0; $i < $count; $i + +) { $keysvalue [] = $array [$keysort [$i]]; } } return $keysvalue; }

For example, there is an array such as the following:

The code is as follows
$array =array ( 0=>array (' id ' =>8, ' username ' => ' phpernote '), 1=>array (' id ' =>9, ' username ' => ' com '), 2=>array (' id ' =>5, ' username ' => ' www ') ); Now you need to sort this two-dimensional array in ascending ID, then: Array_sort ($array, ' id ', ' ASC ');