Add Missing Image Dimensions throws PHP Warning: simplexml_load_file() [...] when relative path is used for SVG

[NataliaDrause]

Before submitting an issue please check that you’ve completed the following steps:

• Made sure you’re on the latest version - 3.11.2
• Used the search feature to ensure that the bug hasn’t been reported before - yes

Describe the bug The following PHP warning is being logged when a relative path is used for SVG.

PHP Warning:  simplexml_load_file(): %2Fhome4%2Ftest%2Ftestsite.com%2Fwp-content%2Fgoogle-play-badge.svg:30: namespace warning : xmlns: URI &ns_sfw; is not absolute in /home4/test/testsite.com/wp-content/plugins/wp-rocket/inc/Engine/Media/ImageDimensions/ImageDimensions.php on line 496
PHP Warning:  simplexml_load_file(): 	<sfw  xmlns="&ns_sfw;"> in /home4/test/testsite.com/wp-content/plugins/wp-rocket/inc/Engine/Media/ImageDimensions/ImageDimensions.php on line 496
PHP Warning:  simplexml_load_file(): 	                      ^ in /home4/test/testsite.com/wp-content/plugins/wp-rocket/inc/Engine/Media/ImageDimensions/ImageDimensions.php on line 496

To Reproduce Steps to reproduce the behavior:

1. Add an SVG your-svg.svg to the server (in my case in /wp-content/ directory).
2. Add the following markup on the post with HTML block: <img alt="Google Play" src="/wp-content/your-svg.svg" class="google-play">
3. Enable Add Missing Image Dimensions option in WP Rocket settings.
4. Preload or visit the page.
5. Debug log will have the PHP warning logged

Expected behavior no warnings should be logged

Additional context Ticket: https://secure.helpscout.net/conversation/1899887147/345420?folderId=3864740

Backlog Grooming (for WP Media dev team use only)

• [ ] Reproduce the problem
• [ ] Identify the root cause
• [ ] Scope a solution
• [ ] Estimate the effort

[CrochetFeve0251]

Reproduce the problem

I was able to reproduce the error with a diffrent svg using the one from this issue: https://forge.typo3.org/issues/86428

Identify the root cause

The root cause I that the content from the SVG is malformed and that generate a warning.

Scope a solution

To solve this problem we can simply add a new param to not show warnings from the function.

$svgfile = simplexml_load_file( rawurlencode( $filename ), 'SimpleXMLElement', LIBXML_NOERROR | LIBXML_NOWARNING );

This is the only problem as dimensions are loaded on the final SVG.

Estimate the effort

[xs]