PHP deletes the sub-characters at the end of the string, deletes the starting character, and deletes the characters at both ends (implementation code)_PHP tutorial

Today I encountered the following problem when dealing with deleting specific characters at both ends of a string. Let’s look at the example first

$str = 'akmumu/writtendb.json';
What I want to do is delete the akmumu at the beginning, and then delete the .json at the end, so that only useful characters are retained/writedb
Start I used ltrim to delete akmumu, and then used rtrim to delete .json
It turned out that I understood trim wrong. The parameters of trim are as follows
rtrim(string,charlist)
His parameters are charlist, which is not necessarily the case. Search in order, for example, if I give a
$str = 'akmumu/writedbsojn.json';
the result is still /write, the /writedbsojn I want does not appear, that is to say, as long as any character in the charlist matches It goes on like this. . .
So I just use something else
str_replace, substr_replace
For safety reasons, I added code to prevent interception errors

Copy Code The code is as follows:

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);
}
}
}

That’s it

http://www.bkjia.com/PHPjc/327881.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/327881.htmlTechArticleToday I encountered the following problem when dealing with deleting specific characters at both ends of a string. Let’s look at the example SPAN style=" FONT-SIZE: 18px"/SPAN $str = 'akmumu/writedb.json'; What I want to do is delete the start...