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Homephp教程php手册php删除字符串末尾子字符,删除开始字符,删除两端字符

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,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

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,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,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

 

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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