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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 |
|---|---|
| 393 | if ( IMAGETYPE_GIF == $orig_type ) { |
| 394 | if ( !imagegif( $newimage, $destfilename ) ) |
| 395 | return new WP_Error('resize_path_invalid', __( 'Resize path invalid' )); |
| 396 | } elseif ( IMAGETYPE_PNG == $orig_type ) { |
| 397 | if ( !imagepng( $newimage, $destfilename ) ) |
| 398 | return new WP_Error('resize_path_invalid', __( 'Resize path invalid' )); |
| 399 | } else { |
| 400 | // all other formats are converted to jpg |
| 401 | $destfilename = "{$dir}/{$name}-{$suffix}.jpg"; |
| 402 | if ( !imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality, 'image_resize' ) ) ) |
| 403 | return new WP_Error('resize_path_invalid', __( 'Resize path invalid' )); |
| 404 | } |
| 405 | |
| 406 | imagedestroy( $newimage ); |
| 407 | |
| 408 | // Set correct file permissions |
| 409 | $stat = stat( dirname( $destfilename )); |
| 410 | $perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits |
| 411 | @ chmod( $destfilename, $perms ); |