Home > Article > Backend Development > 为什么回调函数在array_filter()里面没有起作用？
为什么回调函数在array_filter()里面没有起作用？
- WBOYOriginal
- 2016-06-23 14:26:041188browse
array_filter() 回调函数
<?php function myFunction($v) { if ($v==="Dog") { return "Fido"; } return $v; } $a=array("Horse","Dog","Cat"); //Array ( [0] => Horse [1] => Fido [2] => Cat ) print_r(array_map("myFunction",$a)); //Array ( [0] => Horse [1] => Dog [2] => Cat ) //为什么回调函数在array_filter()里面没有起作用？ print_r(array_filter($a,"myFunction")); ?> 回复讨论(解决方案)
去看下array_filter 的用法就会明白
function myFunction($v) { if ($v==="Dog") { return true; } return false; } $a=array("Horse","Dog","Cat"); //Array ( [0] => Horse [1] => Fido [2] => Cat ) print_r(array_map("myFunction",$a)); //Array ( [0] => Horse [1] => Dog [2] => Cat ) //为什么回调函数在array_filter()里面没有起作用？ print_r(array_filter($a,"myFunction")); 明白了，谢谢两位
Statement：
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
Previous article：网站流量统计第三方服务推荐Next article：坛里有朋友搞过阿里巴巴API的授权请求吗