<?php
class='pingjiaF' frameborder='0' src='https://www.ofstack.com' scrolling='no'>
Sort an array
usort() The function sorts an array using a user-defined function.
*/
function cmp($a, $b) // User-defined callback functions
{
if($a==$b) // If the two parameters are equal
{
return 0; // return 0
}
return($a>$b)?-1:1; // If the first 1 Is greater than the control 2 A return 1 , otherwise, -1
}
$a=array(3,2,5,6,1); // define 1 An array
usort ($a,"cmp"); // Sort an array using a custom function
foreach($a as $key=>$value) // Loop out sorted key-value pairs
{
echo "$key:$valuen";
}
/*
Note: If two elements compare identically, their order in the sorted array is undefined. to php 4.0.6 Previously, user-defined functions would keep these elements in their original order. But since the 4.1.0 A new sorting algorithm is introduced, and the result will not be like this, because there is no sorting algorithm 1 An effective solution.
*/
// Sort array key names uksort(array,sorttype)
function cmp($a, $b) // User-defined callback functions
{
if($a==$b) // If the two parameters are equal
{
return 0; // return 0
}
return($a>$b)?-1:1; // If the first 1 Is greater than the control 2 A return 1 , otherwise, -1
}
$a=array(4=>"four",3 =>"three",20 =>"twenty",10=>"ten"); // define 1 An array
uksort ($a,"cmp"); // Sorts array key names using a custom function
foreach($a as $key=>$value) // Loop out sorted key-value pairs
{ // www.ofstack.com
echo "$key:$valuen";
}/*
uksort() The function sorts an array by key name and maintains an index relationship using a user-defined comparison function.
Returns if successful true Otherwise return false .
If the array you want to sort needs to be used 1 Sort by an unusual standard, then you should use this function.
The custom function should take two arguments that will be included in the array 1 Fill in the key name. Compare the function in theta 1 Is less than, equal to, or greater than 2 Each parameter must be returned separately 1 An integer less than, equal to, or greater than zero.
*/
/*
sort() The function sorts the values of a given array in ascending order.
Note: This function assigns a new key name to a cell in an array. The original key name has been deleted.
Returns if successful true Otherwise return false .
*/
$fruits=array("lemon","orange","banana","apple"); // define 1 An array
sort($fruits); // Sort the array
foreach($fruits as $key=>$val) // Loop out the sorted key-value pairs of the array
{
echo "$key=$valn"; // Output key-value pairs
}