wp_http_validate_url() - PHP Notice: undefined index port

[jesin]

If the URL of my WordPress site is ​http://example.com/ and I pass the same URL with a port number which is NOT 80, 443 or 8080 to the wp_http_validate_url() function the following PHP notice is shown.

Notice:  Undefined index: port in /var/www/wp-includes/http.php on line 513

Code to reproduce the problem.

var_dump ( wp_http_validate_url( 'http://yoursite.com:81' ) );

Output:

Notice:  Undefined index: port in /var/www/wp-includes/http.php on line 513
bool(false)

Expected output:

bool(false)

[jesin]

Check if index port is set before comparing

[SergeyBiryukov]

Introduced in [23329], moved to wp_http_validate_url() in [24480].

[SergeyBiryukov]

In 27953:

Avoid an undefined index notice in wp_http_validate_url().

props jesin.
fixes #27684.