string $filtered_image, string $context, int $attachment_id )
Filters an img tag within the content for a given context.
Full img tag with attributes that will replace the source img tag.
Additional context, like the current filter name or the function name from where this was called.
The image attachment ID. May be 0 in case the image is not an attachment.
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$filtered_image = apply_filters( 'wp_content_img_tag', $filtered_image, $context, $attachment_id );