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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 |
|---|---|
| 478 | ); |
| 479 | |
| 480 | if ( null !== $saved ) { |
| 481 | return $saved; |
| 482 | } |
| 483 | |
| 484 | switch ( $mime_type ) { |
| 485 | case 'image/jpeg': |
| 486 | /** This filter is documented in wp-includes/class-wp-image-editor.php */ |
| 487 | return imagejpeg( $image, $filename, apply_filters( 'jpeg_quality', 90, 'edit_image' ) ); |
| 488 | case 'image/png': |
| 489 | return imagepng( $image, $filename ); |
| 490 | case 'image/gif': |
| 491 | return imagegif( $image, $filename ); |
| 492 | case 'image/webp': |
| 493 | if ( function_exists( 'imagewebp' ) ) { |
| 494 | return imagewebp( $image, $filename ); |
| 495 | } |
| 496 | return false; |