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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 |
|---|---|
| 243 | |
| 244 | if ( null !== $saved ) |
| 245 | return $saved; |
| 246 | |
| 247 | return $image->save( $filename, $mime_type ); |
| 248 | } else { |
| 249 | _deprecated_argument( __FUNCTION__, '3.5', __( '$image needs to be an WP_Image_Editor object' ) ); |
| 250 | |
| 251 | $image = apply_filters('image_save_pre', $image, $post_id); |
| 252 | $saved = apply_filters('wp_save_image_file', null, $filename, $image, $mime_type, $post_id); |
| 253 | |
| 254 | if ( null !== $saved ) |
| 255 | return $saved; |
| 256 | |
| 257 | switch ( $mime_type ) { |
| 258 | case 'image/jpeg': |
| 259 | return imagejpeg( $image, $filename, apply_filters( 'jpeg_quality', 90, 'edit_image' ) ); |
| 260 | case 'image/png': |
| 261 | return imagepng( $image, $filename ); |