php usort

Sort an array: the Usort () function uses a user-defined function to sort the array, with the instance code as follows: function cmp ($a, $b)//user-defined callback function {if ($a = = $b)//If two parameters are equal {return 0;//return 0} return ($

Sort an array: the Usort () function uses a user-defined function to sort the array, with the instance code as follows: function cmp ($a, $b)//user-defined callback function {if ($a = = $b)//If two parameters are equal {return 0;//return 0} return ($

In PHP, the usort solves the problem of changing the original position at the same time. After PHP4.1.0, the original position of usort may change when the compare value is the same. this is the case in the document: Iftwomemberscompareasequal,

Sort an array: the Usort () function uses a user-defined function to sort the array, with the instance code as follows: function cmp ($a, $b)//user-defined callback function {if ($a = = $b)//If two parameters are equal {return 0;//return 0} return ($

Use the PHP function usort () to implement custom sorting. There are many ways to sort arrays in, including sorting by value, by keyword, and by natural language. Today, we want to teach you how to use the PHP function usort () to sort arrays in

Sort an array: the Usort () function uses a user-defined function to sort the array, with the instance code as follows: function cmp ($a, $b)//user-defined callback function {if ($a = = $b)//If two parameters are equal {return 0;//return 0} return ($

Is there a performance difference between array_multisort and usort functions used to process two-dimensional array or multi-dimensional array sorting? Is there a performance difference between array_multisort and usort functions used to process two-

From:http://www.php100.com/cover/php/2395.htmlUsort(PHP 4, PHP 5)usort- using a user-defined comparison function to sort values in an arrayDescriptionBOOL usort ( array & $array , callback $cmp _function ) This function will use a user-defined

After PHP4.1.0, the original position of usort may change when the compare values are the same. if the two compare values are the same, their order in the sorting results will be random. If you need to keep the original position of the same value,

From PHP 4.1.0, the original position may change when the value of the usort is compared, as in the document: If Compare as equal, their order in the sorted array is undefined. That is, if the 2 values of the comparison are the same, their order in