Page 568 - Beginning PHP 5.3

Part III: Using PHP in Practice

Figure 17-21

The imagecopyresampled() function, although slightly slower, interpolates the pixels so that you do
not get that blocky effect. Both the imagecopyresized() and the imagecopyresampled() functions
take the same ten parameters:

❑ The destination image
❑ The source image
❑ The x and y coordinates in the destination image of the top - left corner of the copied block
of pixels
❑ The x and y coordinates in the source image indicating the top - left corner of the block to copy
❑ The resized width and height of the copied block in the destination image

❑ The width and height of the block of image data to be copied out of the original image

The script uses the imagecopyresampled() function to copy the entire image data to the thumbnail
image, scaling it down as it goes:

imagecopyresampled( $myThumbnail, $mainImage, 0, 0, 0, 0, $thumbWidth,
$thumbHeight, $mainWidth, $mainHeight );

Finally the script sends the image data to the browser (see Figure 17 - 22) and cleans up the memory that
the images used:

header( “Content-type: image/jpeg” );
imagejpeg( $myThumbnail );
imagedestroy( $myThumbnail );
imagedestroy( $mainImage );

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