Preg_replace特殊字符＆

Good afternoon,

I have an error in my preg_replace. I would like to replace && with only one &, and ?& with ?.

My code looks like this:

$reg = preg_replace("#\&\&#is", "&
        ", $reg);    
$reg = preg_replace("#\?\&#is", "?
        ", $reg);

Could you please help me fix this? I am sure, it some basic error, so sorry for that...

Thanks!

You do not need to escape & only the ?

$reg = preg_replace("#&&#", "&", $reg);

$reg = preg_replace("#\?&#", "?", $reg);

You can simplify the two regexs into one.

echo preg_replace("#([?&])\s*&#", "$1", ' ? &lang=en');

Output:

 ?lang=en

Your modifiers didn't make sense since you aren't using alpha characters or the ..

Also & isn't a special regex character, just ?. If in a character class ([]) neither will need to be replaced.