Php how to remove any last commas

问题

Example output

1. test,test,test,test,test,
2. test,test,test,,
3. test,test,,,
4. test,,,,,

I tried use implode according to my previous question but It's trim only last comma.

How to remove any last commas?

回答1:

rtrim('test,,,,,', ',');

See the manual.

回答2:

rtrim for example:

$str = 'foo,bar,blah,bleh,';
echo rtrim($str,',');

// foo,bar,blah,bleh

回答3:

completely different way:

$str = "1,2,3,4,";
$str = substr($str,0,strlen($str)-1);

来源：https://stackoverflow.com/questions/3120398/php-how-to-remove-any-last-commas