在php教程中數(shù)組是種強(qiáng)大的數(shù)據(jù)類型，他可以做的事情很多，可以存儲(chǔ)不同的數(shù)據(jù)類型在一個(gè)數(shù)組中，下面我們列出了數(shù)組常用的操作，排序，鍵名對(duì)數(shù)組排序等做法。

使用函數(shù)array_keys()，得到數(shù)組中所有的鍵，參數(shù)：數(shù)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(shù)array_values()，得到數(shù)組中所有的值，參數(shù)：數(shù)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(shù)array_map()，使每個(gè)元素都調(diào)用一下自定義函數(shù)，參數(shù)：String類型函數(shù)名稱，數(shù)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(shù)array_merge()，把兩個(gè)數(shù)組合并成一個(gè)，參數(shù)：數(shù)組，數(shù)組

關(guān)聯(lián)數(shù)組合并時(shí)，鍵相同的會(huì)被后面的數(shù)組覆蓋

索引數(shù)組合并時(shí)，會(huì)連接在一起形成一個(gè)新的數(shù)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(shù)ksort()，按照鍵名進(jìn)行排序，注意沒(méi)有返回新的數(shù)組，還是原來(lái)的數(shù)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(shù)array_search()，搜索某個(gè)鍵值，返回對(duì)應(yīng)的鍵

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

echo array_search("taoshihan1",$arr);

// 1