PHP中Array相關函數簡介_php技巧

使用函數array_keys()，得到數組中所有的鍵，參數：數組

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

使用函數array_values()，得到數組中所有的值，參數：數組

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

使用函數array_map()，使每個元素都調用一下自訂函數，參數：String類型函數名稱，數組

$arr=array();$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 )

使用函數array_merge()，把兩個數組合并成一個，參數：數組，數組

關聯陣列合并時，鍵相同的會被後面的數組覆蓋

索引數組合并時，會串連在一起形成一個新的數組

$arr=array();$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 )

使用函數ksort()，按照鍵名進行排序，注意沒有返回新的數組，還是原來的數組

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

使用函數array_search()，搜尋某個索引值，返回對應的鍵

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