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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 |
|---|---|
| 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. |
| 126 | // if either width or height are empty, no constraint is applied on that dimension. |
| 127 | function wp_constrain_dimensions( $current_width, $current_height, $max_width=0, $max_height=0 ) { |
| 128 | if ( !$max_width and !$max_height ) |
| 129 | return array( $current_width, $current_height ); |