PHP Regex用于重写404脚本中的部分URL

Question

I have a php script handling URL's that are about to be redirected to 404.

How can I rewrite an URL like example.com/oldnonexistentcategory-actualproduct- product_reviews-actualproduct.htm to example.com/ product_reviews-actualproduct.htm ?

Said another way - how do I remove everything between "example.com/" and "product_reviews" ?

The only consistent part of the URL is that it contains example.com and product_reviews. I've considered using preg_match/preg_replace but I'm very new at regex syntax.

Answer 1

If all your URL are based like that, don't use preg_match but explode which is faster and easier to use :

<?php

// ...

$explodedUrl = explode('-', 'oldnonexistentcategory-actualproduct-product_reviews-actualproduct.htm');

$redirectUrl = $explodedUrl[2].'-'.$explodedUrl[3];

echo $redirectUrl; // product_reviews-actualproduct.htm

But be careful, this suppose 2 things :

1. Your URL are always based on 4 parts, separated by "-": " string-string-string-string.htm "
2. A part of the slug " string " can't have a "-" char (Otherwise, the script will not work corretly).

So make sure you don't have a slug with "-" char in a part , not like that : old-non-existent-category-actual-product-product-reviews-actual-product.htm

If your URL can have more or less than 4 parts, and you always want the 2 last parts, you can make your script dynamic, it's easy :

$numberPart = count($explodedUrl);
$redirectUrl = $explodedUrl[$numberPart - 2].'-'.$explodedUrl[$numberPart - 1];

EDIT:

Can I use explode to remove everything between / and product_reviews?

Absolutely !

$explodedUrl = explode('product_reviews-', 'oldnonexistentcategory-actualproduct-product_reviews-actualproduct.htm');
$redirectUrl = $explodedUrl[count($explodedUrl) - 1]; // Get string after "product_reviews-"
echo $redirectUrl; // actualproduct.htm

// So finally :
echo "example.com/product_reviews-".$redirectUrl; // example.com/product_reviews-actualproduct.htm