php删除字符串末尾子字符,删除开始字符,删除两端字符(实现代码)
今天在处理删除字符串两端的特定字符时遇到了下面的问题,先看例子
$str = 'akmumu/writedb.json';
我要做的是删除开始的akmumu,网站空间,再删除末尾的.json,这样只保留有用的字符/writedb
开始我使用的ltrim删除akmumu,再使用rtrim删除.json
结果发现我理解trim错误了,trim的参数如下
rtrim(string,charlist)
他的参数时charlist,服务器空间,香港服务器租用,也就是不一定按照顺序查找,比如我给一个
$str = 'akmumu/writedbsojn.json';
结果还是/write,我想要的/writedbsojn没有出现,也就是说只要charlist中的任意字符匹配就一直这么下去了。。。
所以就用别的了
str_replace,substr_replace即可
安全起见,增加了代码,防止再截取错误
复制代码 代码如下:
if(strpos($str,'akmumu/') !== FALSE
$str = substr($str,7);
if(strpos($str,'.json') !== FALSE)
{
if(substr($str,-5,5) == '.json')
{
$str = substr_replace($str,'',-5);
}
}
}
这样就可以了
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