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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 |
|---|---|
| 375 | $saved = apply_filters_deprecated( 'wp_save_image_file', array( null, $filename, $image, $mime_type, $post_id ), '3.5.0', 'wp_save_image_editor_file' ); |
| 376 | |
| 377 | if ( null !== $saved ) { |
| 378 | return $saved; |
| 379 | } |
| 380 | |
| 381 | switch ( $mime_type ) { |
| 382 | case 'image/jpeg': |
| 383 | /** This filter is documented in wp-includes/class-wp-image-editor.php */ |
| 384 | return imagejpeg( $image, $filename, apply_filters( 'jpeg_quality', 90, 'edit_image' ) ); |
| 385 | case 'image/png': |
| 386 | return imagepng( $image, $filename ); |
| 387 | case 'image/gif': |
| 388 | return imagegif( $image, $filename ); |
| 389 | default: |
| 390 | return false; |
| 391 | } |
| 392 | } |
| 393 | } |