Home > Backend Development > PHP Tutorial > Detailed explanation of the use of php array_map() array function

Detailed explanation of the use of php array_map() array function

怪我咯
Release: 2023-03-12 21:54:01
Original
1864 people have browsed it

Functionarray_map() function: multiple arraysCallback function---Apply the callback function to the cells of the given array

The code is as follows:

/*函数array_map()函数:多数组回调函数---将回调函数作用到给定数组的单元上 
* 1、语法:array array_map ( callback callback, array arr1 [, array ...] ) 
* 2、描述:返回一个数组,该数组包含了 arr1 中的所有单元经过 callback 作用过之后的 
* 单元。callback 接受的参数数目应该和传递给 array_map() 函数的数组数目一致。 
* 3、
注意事项
: 
* 3.1、多数组回调函数作用于一个数组时,将保留原有数组的键名,也就是返回的数组的键名就是 
* 作用到给定数组的键名 
* 3.2、多数组回到函数作用于两个或多个数组时,他们的长度要一致,并且将忽略原来多个数组的 
* 键名,统一分配数字索引作为键名 
*/ 
//单个
数组使用
的例子 
$websites=array("g"=>"google","b"=>"baidu","y"=>"yahoo"); 
//输出原数组 
echo "<pre class="brush:php;toolbar:false">"; 
print_r($websites); 
echo "
"; //定义对单个数组处理的回调函数 function change_value($value){ return ucfirst ($value).".com"; } $urls=array_map('change_value',$websites); echo "
"; 
print_r($urls); 
echo "
"; //多个数组使用的例子 $arr1=array(1,3,5,7); $arr2=array(2,4,6,8); //定义对多个数组处理的回调函数 function func1($a,$b){ return $a*$b; } $results=array_map('func1',$arr1,$arr2); echo "利用回调函数对多个数组处理后,返回的结果:
"; echo "
"; 
print_r($results); 
echo "
";
Copy after login

The running effect is as follows:

The above is the detailed content of Detailed explanation of the use of php array_map() array function. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template