PHP array_multisort函数有什么用
PHP “array_multisort”函数用于返回一个排序数组,该函数的语法是“array_multisort(array1,sorting order,sorting type,array2,array3...)”。
PHP array_multisort函数有什么用?
PHP array_multisort函数
定义和用法
array_multisort() 函数返回一个排序数组。您可以输入一个或多个数组。函数先对第一个数组进行排序,接着是其他数组,如果两个或多个值相同,它将对下一个数组进行排序。
注释:字符串键名将被保留,但是数字键名将被重新索引,从 0 开始,并以 1 递增。
注释:您可以在每个数组后设置排序顺序和排序类型参数。如果没有设置,每个数组参数会使用默认值。
语法
array_multisort(array1,sorting order,sorting type,array2,array3...)
参数描述 array1必需。规定数组。 sorting order可选。规定排列顺序。可能的值: SORT_ASC - 默认。按升序排列 (A-Z)。 SORT_DESC - 按降序排列 (Z-A)。 sorting type可选。规定排序类型。可能的值: SORT_REGULAR - 默认。把每一项按常规顺序排列(Standard ASCII,不改变类型)。 SORT_NUMERIC - 把每一项作为数字来处理。 SORT_STRING - 把每一项作为字符串来处理。 SORT_LOCALE_STRING - 把每一项作为字符串来处理,基于当前区域设置(可通过 setlocale() 进行更改)。 SORT_NATURAL - 把每一项作为字符串来处理,使用类似 natsort() 的自然排序。 SORT_FLAG_CASE - 可以结合(按位或)SORT_STRING 或 SORT_NATURAL 对字符串进行排序,不区分大小写。 array2可选。规定数组。 array3可选。规定数组。
返回值: 如果成功则返回 TRUE,如果失败则返回 FALSE。
更新日志: 排序类型 SORT_NATURAL 和 SORT_FLAG_CASE 是在 PHP 5.4 中新增的。
排序类型 SORT_LOCALE_STRING 是在 PHP 5.3 中新增的。
实例
返回一个升序排列的数组:
<?php $a1=array("Dog","Cat"); $a2=array("Fido","Missy"); array_multisort($a1,$a2); print_r($a1); print_r($a2); ?>
运行结果:
Array ( [0] => Cat [1] => Dog ) Array ( [0] => Missy [1] => Fido )
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