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array_diff()
函数返回多个数组的差集数组,键名不进行比较,返回与第一个数组相比,第一个数组没有的值(数组)
形式:array_diff(array1,array2,array3…);
例子:
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$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("e"=>"red","f"=>"black","g"=>"purple"); $a3=array("a"=>"red","b"=>"black","h"=>"yellow"); // $result=array_diff($a1,$a2,$a3);//Array ( [b] => green [c] => blue ) $result=array_diff($a1,$a2);//Array ( [b] => green [c] => blue [d] => yellow ) |
array_change_key_case()
将数组的所有的键都转换为大写字母或小写字母
形式:array_change_key_case(array,case);
case可选值CASE_LOWER小写(默认) CASE_UPPER 大写
例子:
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$age=array("Bill"=>"60","Steve"=>"56","Mark"=>"31"); print_r(array_change_key_case($age));// Array ( [bill] => 60 [steve] => 56 [mark] => 31 ) print_r(array_change_key_case($age,CASE_LOWER));// Array ( [bill] => 60 [steve] => 56 [mark] => 31 ) print_r(array_change_key_case($age,CASE_UPPER));//Array ( [BILL] => 60 [STEVE] => 56 [MARK] => 31 ) |
array()
array_chunk()
将数组按数量分为多个数组
形式:array_chunk(array,size[,preserve_key]);
preserve_key的参数:true保留原始键名 false(默认)不保留原始键名
例子:
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$cars=array("Volvo","BMW","Toyota","Honda","Mercedes"); print_r(array_chunk($cars,2)); // Array ( [0] => Array ( [0] => Volvo [1] => BMW ) // [1] => Array ( [0] => Toyota [1] => Honda ) // [2] => Array ( [0] => Mercedes ) ) |
array_column()
返回输入数组中某个单一列的值。
形式:array_column(array,column_key[,index_key]);
column_key:单列的键名
index_key:返回数组的索引,比如用id作为键名…不写则从零依次递加
例子:
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$a = array( array( 'id' => 5698, 'first_name' => 'Bill', 'last_name' => 'Gates', ), array( 'id' => 4767, 'first_name' => 'Steve', 'last_name' => 'Jobs', ), array( 'id' => 3809, 'first_name' => 'Mark', 'last_name' => 'Zuckerberg', ) ); $last_names = array_column($a, 'last_name', 'id'); print_r($last_names); //Array ( [5698] => Gates [4767] => Jobs [3809] => Zuckerberg ) //Array ( [0] => Gates [1] => Jobs [2] => Zuckerberg ) |
array_combine()
通过两个数组创建新的数组
形式:array_combine(keys,values);
第一个是键名,第二个是键值
键名与键值要数量相同,否则报错
例子:
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$fname=array("Bill","Steve","Mark","ceshi"); $age=array("60","56","31","1"); $c=array_combine($fname,$age); print_r($c); // Array ( [Bill] => 60 [Steve] => 56 [Mark] => 31 [ceshi] => 1 ) |
array_count_values()
用于统计数组中所有值出现的次数
形式:array_count_values(array)
例子:
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$a=array("A","Cat","Dog","A","Dog"); print_r(array_count_values($a)); // Array ( [A] => 2 [Cat] => 1 [Dog] => 2 ) |
