php string replace http to https (with www or not)

Question

I've a string like this:

$url = '<p>IMAGE 1:</p><img src="http://example.com/image1.jpg"><br><p>IMAGE 2:</p><img src="http://www.example.com/image2.jpg"><br><p>IMAGE 3:</p><img src="http://externalsite.com/image3.jpg"><br><p>IMAGE 4:</p><img src="http://www.externalsite.com/image4.jpg">'

example.com is the domain where my webapp is located.

I need:

check if example.com is http or https
if https, replace all http://example.com and http://www.example.com in my string to: https://www.example.com (so not include other domains like externalsite.com)

For first point I can use: $isHttps = !empty($_SERVER['HTTPS']) ? true : false;

For second point i'm not sure how create a preg_replace correctly

The domain `mysite.com` does not appear anywhere in your input string. Can you clarify your question? — Tim Biegeleisen, Dec 17 '19 at 13:40
@DevsiOdedra my string has different urls inside...and others text,span,div etc... it is not only a single url — Giuseppe Lodi Rizzini, Dec 17 '19 at 13:43

score 0 · Answer 1 · answered Dec 17 '19 at 13:44

I think this is the logic you want. We can search for the following regex pattern:

http://(?:www\.)?example\.com

This would match both http://example.com and http://www.example.com. Then, we can replace with the https version of these URLs.

$url = '<p>IMAGE 1:</p><img src="http://example.com/image1.jpg"><br><p>IMAGE 2:</p><img src="http://www.example.com/image2.jpg"><br><p>IMAGE 3:</p><img src="http://externalsite.com/image3.jpg"><br><p>IMAGE 4:</p><img src="http://www.externalsite.com/image4.jpg">';
$output = preg_replace("/http:\/\/(?:www\.)?example\.com/", "https://www.example.com", $url);
echo $output;

This prints:

<p>IMAGE 1:</p><img src="https://www.example.com/image1.jpg"><br><p>IMAGE 2:</p><img src="https://www.example.com/image2.jpg"><br><p>IMAGE 3:</p><img src="http://externalsite.com/image3.jpg"><br><p>IMAGE 4:</p><img src="http://www.externalsite.com/image4.jpg">

I'mm try thanks...but...how can I manipulate example.com as a $variable inside preg_replace? i don't want to hardcode example.com — Giuseppe Lodi Rizzini, Dec 17 '19 at 13:47
@GiuseppeLodiRizzini You must at least know which _variables_ contain the URLs you want to target/replace. Just use `preg_quote()` on them, and then do the replacement on that. — Tim Biegeleisen, Dec 17 '19 at 13:51

php string replace http to https (with www or not)

1 Answers1