PHP中Array相关函数简介

使用函数array_keys()，得到数组中所有的键，参数：数组

$arr=array();$arr['one']="one";$arr['two']="two";$arr['three']="three";$newArr=array_keys($arr);print_r($newArr);//Array ( [0] => one [1] => two [2] => three )

使用函数array_values()，得到数组中所有的值，参数：数组

$arr=array();$arr[20]="one";$arr[30]="two";$arr[40]="three";$newArr=array_values($arr);print_r($newArr);//Array ( [0] => one [1] => two [2] => three )

使用函数array_map()，使每个元素都调用一下自定义函数，参数：String类型函数名称，数组

$arr=array();$arr[0]="one";$arr[1]="two";$arr[2]="three";function test($v){  return $v." Hello";}$newArr=array_map("test",$arr);print_r($newArr);//Array ( [0] => one Hello [1] => two Hello [2] => three Hello )

使用函数array_merge()，把两个数组合并成一个，参数：数组，数组

关联数组合并时，键相同的会被后面的数组覆盖

索引数组合并时，会连接在一起形成一个新的数组

$arr=array();$arr[0]="one";$arr[1]="two";$arr[2]="three";$arr1=array();$arr[3]="taoshihan1";$arr[4]="taoshihan2";$arr[5]="taoshihan3";$newArr=array_merge($arr,$arr1);print_r($newArr);//Array ( [0] => one [1] => two [2] => three [3] => taoshihan1 [4] => taoshihan2 [5] => taoshihan3 )$arr=array("one","two","three");$arr1=array("4","5","6");$newArr=array_merge($arr,$arr1);print_r($newArr);//Array ( [0] => one [1] => two [2] => three [3] => 4 [4] => 5 [5] => 6 )

使用函数ksort()，按照键名进行排序，注意没有返回新的数组，还是原来的数组

$arr=array("2"=>"taoshihan2","1"=>"taoshihan1","3"=>"taoshihan3");ksort($arr);print_r($arr);//Array ( [1] => taoshihan1 [2] => taoshihan2 [3] => taoshihan3 )

使用函数array_search()，搜索某个键值，返回对应的键

$arr=array("2"=>"taoshihan2","1"=>"taoshihan1","3"=>"taoshihan3");echo array_search("taoshihan1",$arr);// 1