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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 107 | * @param string $size Optional. Default is 'medium'. |
| 108 | * @return string HTML IMG element for given image attachment |
| 109 | */ |
| 110 | function get_image_tag($id, $alt, $title, $align, $size='medium') { |
| 111 | |
| 112 | list( $img_src, $width, $height ) = image_downsize($id, $size); |
| 113 | $hwstring = image_hwstring($width, $height); |
| 114 | |
| 115 | $class = 'align'.attribute_escape($align).' size-'.attribute_escape($size).' wp-image-'.$id; |
| 116 | $class = apply_filters('get_image_tag_class', $class, $id, $align, $size); |
| 117 | |
| 118 | $html = '<img src="'.attribute_escape($img_src).'" alt="'.attribute_escape($alt).'" title="'.attribute_escape($title).'" '.$hwstring.'class="'.$class.'" />'; |
| 119 | |
| 120 | $html = apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size ); |
| 121 | |
| 122 | return $html; |
| 123 | } |
| 124 | |
| 125 | // same as wp_shrink_dimensions, except the max parameters are optional. |