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php 数组排序 array

Jun 21, 2016 am 08:55 AM
array gt sort

Example:(简练)
uasort($arr,create_function('$a, $b','return $a[\'line_num\']*************函数定义和语法*************
array_multisort
(PHP4 >= 4.0b4)
array_multisort --- 排序复合或多样尺寸的数组
语法 : bool array_multisort (array ar1 [,mixed arg [,mixed ...[,array...]]])
说明 :
Array_multisort( )能用来立刻将数个数组或多样尺寸(multi-dimensional)数组排序。
输入的数组被看作是表格(table)的栏位,依照列(rows)将它排序,这类似于SQL ORDER BY clause的功能,第一个数组是首要(primary)排序的数组,此数组中的列(值)以下一个输入的数组对照相同的排序。
这个函数的引数结构是个独特(unusual)位元,但是是可变通的。第一个引数必定是个数组,随后的引数可以是个数组或是下个列表的排序旗标(flag)之一。
排序顺序旗标 :
SORT_ASC - 排序成上升的顺序
SORT_DESC - 排序成下降的顺序
排序型态旗标 :
SORT_REGULAR - 正常的比较项目
SORT_NUMERIC - 以数字比较项目
SORT_STRING - 看作是字符串来比较项目
不能使用二个相同型态的旗标指定在各各数组之后,排序的旗标指定在数组引数的后面,只对此数组起作用,其它的将重设为预设的SORT_ASC和SORT_REGULAR在数组引数之后。
成功则传回true,失败则传回false。
*************函数定义和语法*************
uasort()
函数使用用户自定义的比较函数对数组排序,并保持索引关联(不为元素分配新的键)。
如果成功则返回 TRUE,否则返回 FALSE。
该函数主要用于对那些单元顺序很重要的结合数组进行排序。
语法
uasort(array,sorttype)参数 描述
array 必需。规定要排序的数组。
function 必需。用户自定义的函数。
函数必须设计为返回 -1, 0, 或 1,并应该接受两个供比较的参数,同时以类似下面这样的方式来工作:
如果 a = b, 返回 0
如果 a 如果 a > b, 返回 -1
PHP uasort() 函数
定义和用法
uasort() 函数使用用户自定义的比较函数对数组排序,并保持索引关联(不为元素分配新的键)。
如果成功则返回 TRUE,否则返回 FALSE。
该函数主要用于对那些单元顺序很重要的结合数组进行排序。
语法
uasort(array,sorttype)参数 描述
array 必需。规定要排序的数组。
function 必需。用户自定义的函数。
函数必须设计为返回 -1, 0, 或 1,并应该接受两个供比较的参数,同时以类似下面这样的方式来工作:
如果 a = b, 返回 0
如果 a 如果 a > b, 返回 -1
例子

复制代码 代码如下:


function my_sort($a, $b)
{
if ($a == $b) return 0;
return ($a > $b) ? -1 : 1;
}
$people = array("Swanson" => "Joe",
"Griffin" => "Peter", "Quagmire" => "Glenn",
"swanson" => "joe", "griffin" => "peter",
"quagmire" => "glenn");
uasort($people, "my_sort");
print_r ($people);
?>


输出:

复制代码 代码如下:


Array
(
[griffin] => peter
[swanson] => joe
[quagmire] => glenn
[Griffin] => Peter
[Swanson] => Joe
[Quagmire] => Glenn
)



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