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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 |
|---|---|
| 217 | |
| 218 | function wp_save_image_file($filename, $image, $mime_type, $post_id) { |
| 219 | $image = apply_filters('image_save_pre', $image, $post_id); |
| 220 | $saved = apply_filters('wp_save_image_file', null, $filename, $image, $mime_type, $post_id); |
| 221 | if ( null !== $saved ) |
| 222 | return $saved; |
| 223 | |
| 224 | switch ( $mime_type ) { |
| 225 | case 'image/jpeg': |
| 226 | return imagejpeg( $image, $filename, apply_filters( 'jpeg_quality', 90, 'edit_image' ) ); |
| 227 | case 'image/png': |
| 228 | return imagepng($image, $filename); |
| 229 | case 'image/gif': |
| 230 | return imagegif($image, $filename); |
| 231 | default: |
| 232 | return false; |
| 233 | } |
| 234 | } |
| 235 | |