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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 |
|---|---|
| 444 | if ( IMAGETYPE_GIF == $orig_type ) { |
| 445 | if ( !imagegif( $newimage, $destfilename ) ) |
| 446 | return new WP_Error('resize_path_invalid', __( 'Resize path invalid' )); |
| 447 | } elseif ( IMAGETYPE_PNG == $orig_type ) { |
| 448 | if ( !imagepng( $newimage, $destfilename ) ) |
| 449 | return new WP_Error('resize_path_invalid', __( 'Resize path invalid' )); |
| 450 | } else { |
| 451 | // all other formats are converted to jpg |
| 452 | $destfilename = "{$dir}/{$name}-{$suffix}.jpg"; |
| 453 | if ( !imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality, 'image_resize' ) ) ) |
| 454 | return new WP_Error('resize_path_invalid', __( 'Resize path invalid' )); |
| 455 | } |
| 456 | |
| 457 | imagedestroy( $newimage ); |
| 458 | |
| 459 | // Set correct file permissions |
| 460 | $stat = stat( dirname( $destfilename )); |
| 461 | $perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits |
| 462 | @ chmod( $destfilename, $perms ); |