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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 |
|---|---|
| 221 | break; |
| 222 | case 'image/gif': |
| 223 | $image = imagecreatefromgif($filepath); |
| 224 | break; |
| 225 | default: |
| 226 | $image = false; |
| 227 | break; |
| 228 | } |
| 229 | if ( is_resource($image) ) { |
| 230 | $image = apply_filters('load_image_to_edit', $image, $post_id, $size); |
| 231 | if ( function_exists('imagealphablending') && function_exists('imagesavealpha') ) { |
| 232 | imagealphablending($image, false); |
| 233 | imagesavealpha($image, true); |
| 234 | } |
| 235 | } |
| 236 | return $image; |
| 237 | } |
| 238 | |
| 239 | function wp_stream_image($image, $mime_type, $post_id) { |