Poifox Quick Thumbnail Generator

poifox_quick_thumbnail.php

<?php

/**
 * Thumbnail generator function, 
 * used to generate jpeg thumbnails from gif, png and other jpegs; 
 * quite basic for now as it only crops square thumbnails but it will be 
 * improved in the future to support other aspect ratios.
 * 
 * It does ugly upscaling.
 * 
 * @param String $source_path Absolute path of the source image.
 * @param String $dest_path Absolute path of the destination file.
 * @param Int $size Optional thumbnail size in pixels. Default is 50px
 * @param Int $q Optional quality parameter for jpeg compression. Default is 75%
 */
function poifox_quick_thumbnail($source_path, $dest_path, $size = 50, $q = 75) {
	
	// get image size
	list($width, $height) = getimagesize($source_path);

	if( $width == $height ) {
		// Image is square
		$x = $y = 0;
		$newdim = $width;
	} elseif ($width > $height) {
		// Image is landscape
		$x = ( $width / 2 ) - ( $height / 2 );
		$y = 0;
		$newdim = $height;
	} else {
		// Image is portrait
		$x = 0;
		$y = ( $height / 2 ) - ( $width / 2 );
		$newdim = $width;
	}
	
	// Get the bytes from the original image and create a GD image with them
	$original_bytes = file_get_contents($source_path);
	$original = imagecreatefromstring($original_bytes);
	
	// Create a placeholder for the cropped version
	$copy = imagecreatetruecolor($size, $size);
	
	// Copy pixels in the central area into $copy
	imagecopyresampled($copy, $original, 0,0, $x, $y, $size, $size, $newdim, $newdim);
	
	// Save the destination file to the $dest_path specified
	// Saves as jpg with quality 75
	// Returns true on success, false on failure
	return imagejpeg($copy, $dest_path, $q);
	
}

?>