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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 |
|---|---|
| 415 | ); |
| 416 | |
| 417 | if ( null !== $saved ) { |
| 418 | return $saved; |
| 419 | } |
| 420 | |
| 421 | switch ( $mime_type ) { |
| 422 | case 'image/jpeg': |
| 423 | /** This filter is documented in wp-includes/class-wp-image-editor.php */ |
| 424 | return imagejpeg( $image, $filename, apply_filters( 'jpeg_quality', 90, 'edit_image' ) ); |
| 425 | case 'image/png': |
| 426 | return imagepng( $image, $filename ); |
| 427 | case 'image/gif': |
| 428 | return imagegif( $image, $filename ); |
| 429 | case 'image/webp': |
| 430 | if ( function_exists( 'imagewebp' ) ) { |
| 431 | return imagewebp( $image, $filename ); |
| 432 | } |
| 433 | return false; |