PHP preg_replace url string

Question

Ok, so I have a preg_replace statement to replace a url string. First and second variable working but I need help for second string sub ....

$html = str_replace('index.php','index',$html);
$html = preg_replace('/index\?cat=([a-z0-9]+)/i','index/$1',$html);
$html = preg_replace('/index\?cat=([a-z0-9]+)/&sub=([a-z0-9]+)/i','index/$1/$2',$html);

you mean you need help with third? try escaping ampersand at &sub with \&sub — Nihat
– Nihat, Commented Feb 8, 2014 at 17:44
Remove the / right before &sub probably. Also, do the more specific replace first, the less specific one later. If that does not help, please specify input & desired output. Also note, that with proper error reporting, PHP would already have told you what was wrong with it. — Wrikken
– Wrikken, Commented Feb 8, 2014 at 17:44

Toto · Accepted Answer · 2014-02-09 15:53:25Z

2

Assuming $html contains:

index.php?cat=123&sub=456

after the str_replace $html becomes:

index?cat=123&sub=456

after the first preg_replace:

index/123&sub=456

Then the second preg_replace doesn't match.

You'd better to modify the order of the preg_replace:

//$html  ->  index.php?cat=123&sub=456
$html = str_replace('index.php','index',$html);
//$html  ->  index?cat=123&sub=456
$html = preg_replace('/index\?cat=([a-z0-9]+)&sub=([a-z0-9]+)/i','index/$1/$2',$html);
//$html  ->  index/123/456
$html = preg_replace('/index\?cat=([a-z0-9]+)/i','index/$1',$html);
//$html  ->  index/123/456

answered Feb 9, 2014 at 15:53

Toto

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