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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 206 | $image = apply_filters('image_editor_save_pre', $image, $post_id); |
| 207 | |
| 208 | if ( is_wp_error( $image->stream( $mime_type ) ) ) |
| 209 | return false; |
| 210 | |
| 211 | return true; |
| 212 | } else { |
| 213 | _deprecated_argument( __FUNCTION__, '3.5', __( '$image needs to be an WP_Image_Editor object' ) ); |
| 214 | |
| 215 | $image = apply_filters('image_save_pre', $image, $post_id); |
| 216 | |
| 217 | switch ( $mime_type ) { |
| 218 | case 'image/jpeg': |
| 219 | header( 'Content-Type: image/jpeg' ); |
| 220 | return imagejpeg( $image, null, 90 ); |
| 221 | case 'image/png': |
| 222 | header( 'Content-Type: image/png' ); |
| 223 | return imagepng( $image ); |
| 224 | case 'image/gif': |
| Line | Code |
| 245 | $saved = apply_filters('wp_save_image_editor_file', null, $filename, $image, $mime_type, $post_id); |
| 246 | |
| 247 | if ( null !== $saved ) |
| 248 | return $saved; |
| 249 | |
| 250 | return $image->save( $filename, $mime_type ); |
| 251 | } else { |
| 252 | _deprecated_argument( __FUNCTION__, '3.5', __( '$image needs to be an WP_Image_Editor object' ) ); |
| 253 | |
| 254 | $image = apply_filters('image_save_pre', $image, $post_id); |
| 255 | $saved = apply_filters('wp_save_image_file', null, $filename, $image, $mime_type, $post_id); |
| 256 | |
| 257 | if ( null !== $saved ) |
| 258 | return $saved; |
| 259 | |
| 260 | switch ( $mime_type ) { |
| 261 | case 'image/jpeg': |
| 262 | /** This filter is documented in wp-includes/class-wp-image-editor.php */ |
| 263 | return imagejpeg( $image, $filename, apply_filters( 'jpeg_quality', 90, 'edit_image' ) ); |