apply_filters( ‘wp_content_img_tag’, string $filtered_image, string $context, int $attachment_id )

Parameters

$filtered_imagestring

Full img tag with attributes that will replace the source img tag.

$contextstring

Additional context, like the current filter name or the function name from where this was called.

$attachment_idint

The image attachment ID. May be 0 in case the image is not an attachment.