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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 |
|---|---|
| 199 | |
| 200 | list( $img_src, $width, $height ) = image_downsize($id, $size); |
| 201 | $hwstring = image_hwstring($width, $height); |
| 202 | |
| 203 | $class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id; |
| 204 | $class = apply_filters('get_image_tag_class', $class, $id, $align, $size); |
| 205 | |
| 206 | $html = '<img src="' . esc_attr($img_src) . '" alt="' . esc_attr($alt) . '" title="' . esc_attr($title).'" '.$hwstring.'class="'.$class.'" />'; |
| 207 | |
| 208 | $html = apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size ); |
| 209 | |
| 210 | return $html; |
| 211 | } |
| 212 | |
| 213 | /** |
| 214 | * Calculates the new dimentions for a downsampled image. |
| 215 | * |
| 216 | * Same as {@link wp_shrink_dimensions()}, except the max parameters are |
| 217 | * optional. If either width or height are empty, no constraint is applied on |