这里的array_walk为什么要这样用？-慕课网

这里的array_walk为什么要这样用？

来源：5-5 [PDO] 数据库操作类之主键查询

Felix_XP

2016-01-12 23:44

查手册看到
bool array_walk ( array &$array , callable $funcname [, mixed $userdata = NULL ] )

第一个参数是数组，第二个参数是回调函数名

可是第97行老师写的为什么是写

array_walk ($fields , array('PdoMySQL','addSpecilChar'));

为什么不直接回调addSpecilChar？
array应该是返回一个数组吧，这样写不会有问题？

求解惑，谢了

写回答关注

4回答

qq_慕神1420022

2022-03-30 19:52:21

简言之，要更精确用float
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0 0
weixin_慕虎3318521

2019-04-30 11:57:32
这个意思是对$fields中的每一个元素执行了一次
```
 PdoMySQL::addSpecilChar($value)
```
```
$value就是$fields中的每一个元素
```
1 0

慕斯7032...

谢谢，这句话重要

2019-12-19 10:01:10

共 1 条回复 >
杨大锤520

2018-08-11 11:22:10
array_walk()函数的作用是：使用用户自定义的函数对数组中的每个元素做回调处理，所以第一个参数为数组，第二个参数是回调函数名，但要在类内部应用array_walk()函数，有下面的规范：
如果回调函数是类中的静态方法，这样调用：
```
array_walk($array, array('self', 'walkFunction'));
```
或者：
```
array_walk($array, array('className', 'walkFunction')); // className指当前的类名
```
如果回调函数是类中的非静态方法：
```
array_walk($array, array($this, 'walkFunction')); //其中walkFunction为类的方法名
```
当然，如果你不在类中使用，回调函数就可以直接是函数名。例如这样：
```
<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
function test_print($item, $key)
{
    echo "$key. $item<br />\n";
}
array_walk($fruits, 'test_print');
?>
```
结果为：
```
d. lemon
a. orange
b. banana
c. apple
```
0 1
qq_解丶语花_0

2016-05-02 09:17:24

Calling an array Walk inside a class

If the class is static:
array_walk($array, array('self', 'walkFunction'));
or
array_walk($array, array('className', 'walkFunction'));

Otherwise:
array_walk($array, array($this, 'walkFunction'));

0 0

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