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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 |
|---|---|
| 307 | * @since 2.9.0 |
| 308 | * @deprecated 3.5.0 Use wp_save_image_editor_file instead. |
| 309 | * |
| 310 | * @param mixed $override Value to return instead of saving. Default null. |
| 311 | * @param string $filename Name of the file to be saved. |
| 312 | * @param WP_Image_Editor $image WP_Image_Editor instance. |
| 313 | * @param string $mime_type Image mime type. |
| 314 | * @param int $post_id Post ID. |
| 315 | */ |
| 316 | $saved = apply_filters( 'wp_save_image_file', null, $filename, $image, $mime_type, $post_id ); |
| 317 | |
| 318 | if ( null !== $saved ) |
| 319 | return $saved; |
| 320 | |
| 321 | switch ( $mime_type ) { |
| 322 | case 'image/jpeg': |
| 323 | |
| 324 | /** This filter is documented in wp-includes/class-wp-image-editor.php */ |
| 325 | return imagejpeg( $image, $filename, apply_filters( 'jpeg_quality', 90, 'edit_image' ) ); |