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HomeBackend DevelopmentPHP Tutorial数组搜索的时候如何样才能不区分大小写呢

数组搜索的时候怎么样才能不区分大小写呢?
为什么下面2个都搜不到啊,我看了手册说加个false可以的,为什么还不行?

PHP code
<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php $dr=array('cc','Dd','Ee');if(in_array("dd",$dr,false)){    echo "aa";}if(array_search("dd",$dr,false)){    echo "aa";}?>


------解决方案--------------------
如果 needle 是字符串,则比较是区分大小写的。
如果第三个参数 strict 的值为 TRUE 则 in_array() 函数还会检查 needle 的类型是否和 haystack 中的相同。 


------解决方案--------------------
in_array

可选。如果设置该参数为 true,则检查搜索的数据与数组的值的类型是否相同。

值的类型是否相同 不是区分大小写

array_search

如果第三个参数 strict 被指定为 true,则只有在数据类型和值都一致时才返回相应元素的键名。

也是类型和值,并没有说到区分大小写的事情.

按照你的需求

1.遍历 使用字符串比较函数
2.正则
3.全部转换成小写后比较
....

------解决方案--------------------
第三个参数是判断类型的,也就是用===,而不是==。。

封个函数遍历一下行了.
------解决方案--------------------
麻烦你自己看php.net,这种基础问题你将来遇见成百上千个,你都来问吗
------解决方案--------------------
探讨

引用:

如果 needle 是字符串,则比较是区分大小写的。
如果第三个参数 strict 的值为 TRUE 则 in_array() 函数还会检查 needle 的类型是否和 haystack 中的相同。

我想问下in_array函数在什么情况下不区分大小写?
我换成数组还是区分大小写。
$dr=array('cc','Dd','Ee');
$vr=arr……

------解决方案--------------------
自己写一个就是了
PHP code
$dr = array('cc','Dd','Ee');if(in_iarray("dd",$dr,false)){    echo "aa";}function in_iarray($needle, $haystack, $strict=false) {  if(! is_string($needle)) return in_array($needle, $haystack, $strict);  return in_array(strtolower($needle), array_map('strtolower', $haystack));}<div class="clear">
                 
              
              
        
            </div>
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