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

怪我咯
Release: 2023-03-12 21:54:01
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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 "
";
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