Add filter 'image_class' to 'get_image_tag' function in 'wp-includes/media.php'

[ronalfy]

As ​referenced in this post, some would like the ability to remove or customize the class attribute in the media manager.

Recommended solution is to add a new filter called 'image_class' to the 'get_image_tag' function in '/wp-includes/media.php'.

Before:

function get_image_tag($id, $alt, $title, $align, $size='medium') {

	list( $img_src, $width, $height ) = image_downsize($id, $size);
	$hwstring = image_hwstring($width, $height);

	$html = '<img src="'.attribute_escape($img_src).'" alt="'.attribute_escape($alt).'" title="'.attribute_escape($title).'" '.$hwstring.'class="align'.attribute_escape($align).' size-'.attribute_escape($size).' wp-image-'.$id.'" />';

	$url = '';
	$html = apply_filters( 'image_send_to_editor', $html, $id, $alt, $title, $align, $url, $size );

	return $html;
}

After:

function get_image_tag($id, $alt, $title, $align, $size='medium') {

	list( $img_src, $width, $height ) = image_downsize($id, $size);
	$hwstring = image_hwstring($width, $height);
	$class = 'align'.attribute_escape($align).' size-'.attribute_escape($size).' wp-image-'.$id;
	$class = apply_filters('image_class', $class, $id, $align, $size);
	$html = '<img src="'.attribute_escape($img_src).'" alt="'.attribute_escape($alt).'" title="'.attribute_escape($title).'" '.$hwstring.'class="'.$class.'" />';

	$html = apply_filters( 'image_send_to_editor', $html, $id, $alt, $title, $align, $url );

	return $html;
}

Code changed is here:

$class = 'align'.attribute_escape($align).' size-'.attribute_escape($size).' wp-image-'.$id;
	$class = apply_filters('image_class', $class, $id, $align, $size);
	$html = '<img src="'.attribute_escape($img_src).'" alt="'.attribute_escape($alt).'" title="'.attribute_escape($title).'" '.$hwstring.'class="'.$class.'" />';

New filter for get_image_tag() and phpdoc based off of r8027

Patch adds new filter named 'get_image_tag_class' to get_image_tag().

Patch for 2.5 branch based off of r8027

Added patch for 2.5.x too.

(In [8029]) New filter and phpdoc for get_image_tag(). Props jacobsantos. fixes #7065 for trunk

(In [8030]) New filter and phpdoc for get_image_tag(). Props jacobsantos. fixes #7065 for 2.5