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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 |
|---|---|
| 249 | header('Content-Type: image/gif'); |
| 250 | return imagegif($image); |
| 251 | default: |
| 252 | return false; |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | function wp_save_image_file($filename, $image, $mime_type, $post_id) { |
| 257 | $image = apply_filters('image_save_pre', $image, $post_id); |
| 258 | $saved = apply_filters('wp_save_image_file', null, $filename, $image, $mime_type, $post_id); |
| 259 | if ( null !== $saved ) |
| 260 | return $saved; |
| 261 | |
| 262 | switch ( $mime_type ) { |
| 263 | case 'image/jpeg': |
| 264 | return imagejpeg( $image, $filename, apply_filters( 'jpeg_quality', 90, 'edit_image' ) ); |
| 265 | case 'image/png': |
| 266 | return imagepng($image, $filename); |
| 267 | case 'image/gif': |