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Append @2x to image eg @2x.jpg WordPress

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Hi, I am trying to append '@2x' to the end of the second image of my srcset, I can do this easily with javascript, but was wondering if there is a way to in php?

Current code:



<picture>
<?php
$project_thumbnail = rwmb_meta( 'meta_project_images', 'type=image&size=project-thumbnail');
foreach ( $project_thumbnail as $image ){

echo "<source srcset='{$image['url']}, {$image['url']} 2x' >\n";

}
?>

</picture>




What I am trying to generate:



<picture>

<source srcset='featured-480x320.jpg, featured-480x320<strong>@2x</strong>.jpg 2x' >

</picture>




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