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Project CURL Images
Purpose
The purpose of this project is to demonstrate how to use PHP and CURL to get an image URL and resize it. This is useful in a variety of web applications today and may be useful in maintenance endeavors for your own website.

Making a GET Request
	$thumbmaxwidth = 75;			/* Width of the thumbnail image */
	$thumbmaxheight = 75;			/* Height of the thumbnail image */
	$normalmaxwidth = 200;			/* Width of the "mid-sized" image */
	$normalmaxheight = 200;			/* Height of the "mid-sized" image */
	$Rimgbackgroundcolor = 255;		/* In RGB, red index to fill the background with (behind image) */
	$Gimgbackgroundcolor = 255;		/* In RGB, green index to fill the background with (behind image) */
	$Bimgbackgroundcolor = 255;		/* In RGB, blue index to fill the background with (behind image) */
	$err_msg = "";				/* Errors are collected with this variable */
	$tempfilename = "";			/* Name of the file used to temporary stage the retrieved file so it can be worked on */
	$normalfilename = "";			/* Final name of the smaller size of the original image */
	$thumbfilename = "";			/* Final name of the thumbnail size of the original image */
	$itemimageurl = "";			/* The full URL (e.g., http://) to the image to have resized */
	$curluseragent = "Mozilla/5.0 (Windows NT 5.1; rv:29.0) Gecko/20100101 Firefox/29.0";	/* User agent to identify this image retriever as */

		$filePath = "";
		/* Grab filepath and modify so we dump the data to the folder "tmpimgs" located one directory above the current directory this script is in */
		$filePathRaw = dirname(__FILE__);
		$filePathSegments = explode("/", $filePathRaw);
		for ($x = 1; $x < (sizeof($filePathSegments) - 1); $x++) {
			$filePath = $filePath . "/" . $filePathSegments[$x];
		}
		$filePath = $filePath . "/tmpimgs";

		/* Define the names of the files used in the raw image copy process */
		$tempfilename = "raw";			/* Does not need to be a filename with extension on Linux */
		$normalfilename = "200x200.jpg";	/* Final name of the smaller size of the original image */
		$thumbfilename = "75x75.jpg";		/* Final name of the thumbnail size of the original image */

		$itemimageurl = "http://www.somesite.com/someimage.jpg";

		/* Perform simple validation */
		$protocolpos = -1;
		$protocolpos = strpos(strtolower($itemimageurl), "http");
		if ($protocolpos != 0) { $itemimageurl = ""; }
		if (strlen($itemimageurl) > 255) { $itemimageurl = ""; }

		/* Begin Processing */
		if (strlen($itemimageurl) > 0) {
			/* Retrieve the image */
			$err_status = "";
			$tempfilelocation = $filePath . "/" . $tempfilename;
			$curl = curl_init();
			$fp = fopen($tempfilelocation, "w");
			curl_setopt($curl, CURLOPT_URL, $itemimageurl);
			curl_setopt($curl, CURLOPT_FILE, $fp);
			curl_setopt($curl, CURLOPT_USERAGENT, $curluseragent);
			curl_setopt($curl, CURLOPT_TIMEOUT, 30);
			curl_setopt($curl, CURLOPT_MAXREDIRS, 2);
			curl_setopt($curl, CURLOPT_FOLLOWLOCATION, TRUE); // Follow redirects, the number of which is defined in CURLOPT_MAXREDIRS
			curl_setopt($curl, CURLOPT_FORBID_REUSE, TRUE);
			curl_setopt($curl, CURLOPT_FRESH_CONNECT, TRUE);
			curl_exec($curl);
			$err_status = curl_error($curl);
			curl_close($curl);
			fclose($fp);

			/* Continue if no error */
			if (strlen($err_status) == 0) {
				/* Load information regarding the local image */
				list($width, $height, $type, $attr) = getimagesize($tempfilelocation);

				/* Place image into the temporary working area */
				$imgdata = null;
				/* NOTE: $type contains a numeric value instead of the IMAGETYPE_ string value.  Anotated here for reference PHP 4.3.0+. */
				/*
				  $type values:
					1	IMAGETYPE_GIF
					2	IMAGETYPE_JPEG
					3	IMAGETYPE_PNG
					4	IMAGETYPE_SWF
					5	IMAGETYPE_PSD
					6	IMAGETYPE_BMP
					7	IMAGETYPE_TIFF (intel)
					8	IMAGETYPE_TIFF (motorola)
					9	IMAGETYPE_JPC
					10	IMAGETYPE_JP2
					11	IMAGETYPE_JPX
					12	IMAGETYPE_JB2
					13	IMAGETYPE_SWC
					14	IMAGETYPE_IFF
					15	IMAGETYPE_WBMP
					16	IMAGETYPE_XBM
				*/
				switch($type) {
					case 1:
						$imgdata = imagecreatefromgif($tempfilelocation);
						break;
					case 2:
						$imgdata = imagecreatefromjpeg($tempfilelocation);
						break;
					case 3:
						$imgdata = imagecreatefrompng($tempfilelocation);
						break;
					case 16:
						$imgdata = imagecreatefromxbm($tempfilelocation);
						break;
					default:
						break;
				}
				$hasimg = 0;
				if ($imgdata === false) {
					/* We don't have an image */
					$hasimg = -1;
				}
				else { $hasimg = 1; }

				/* Continue if we have either a gif, jpeg, png or xbm */
				if ($hasimg == 1) {
					/* Create thumbnail and resize the original as may be needed */
					$originalaspectratio = $width / $height;
					/* STEP 1: NORMAL RESIZE OF ORIGINAL */
					$normalaspectratio = 0;
					$normalwidth = 0;
					$normalheight = 0;
					$xletterbox = 0;
					$yletterbox = 0;
					/* Initial resize retaining proportions */
					if ($height > $width) {
						$originalaspectratio = $normalmaxheight / $height;
						$normalheight = $normalmaxheight;
						$normalwidth = $width * $originalaspectratio;
						$xletterbox = round(($normalmaxwidth - $normalwidth) / 2);
					}
					elseif ($height == $width) {
						$originalaspectratio = $normalmaxheight / $height;
						$normalheight = $normalmaxheight;
						$normalwidth = $width * $originalaspectratio;
						$xletterbox = round(($normalmaxwidth - $normalwidth) / 2);
					}
					else {
						$originalaspectratio = $normalmaxwidth / $width;
						$normalheight = $height * $originalaspectratio;
						$normalwidth = $normalmaxwidth;
						$yletterbox = round(($normalmaxheight - $normalheight) / 2);
					}
					/* Generate the resized image (as JPG) */
					$normalimage = imagecreatetruecolor($normalmaxwidth, $normalmaxheight);
					$bgcolor = imagecolorallocate($normalimage, $Rimgbackgroundcolor, $Gimgbackgroundcolor, $Bimgbackgroundcolor);
					imagefill($normalimage, 0, 0, $bgcolor);
					imagecopyresampled($normalimage, $imgdata, $xletterbox, $yletterbox, 0, 0, $normalwidth, $normalheight, $width, $height);
					imagejpeg($normalimage, $filePath . "/" . $normalfilename, 90);
					imagedestroy($normalimage);

					/* STEP 2: THUMBNAIL RESIZE OF ORIGINAL */
					$thumbaspectratio = 0;
					$thumbwidth = 0;
					$thumbheight = 0;
					$xletterbox = 0;
					$yletterbox = 0;
					/* Initial resize retaining proportions */
					if ($height > $width) {
						$thumbaspectratio = $thumbmaxheight / $height;
						$thumbheight = $thumbmaxheight;
						$thumbwidth = $width * $thumbaspectratio;
						$xletterbox = round(($thumbmaxwidth - $thumbwidth) / 2);
					}
					elseif ($height == $width) {
						$thumbaspectratio = $thumbmaxheight / $height;
						$thumbheight = $thumbmaxheight;
						$thumbwidth = $width * $thumbaspectratio;
						$xletterbox = round(($thumbmaxwidth - $thumbwidth) / 2);
					}
					else {
						$thumbaspectratio = $thumbmaxwidth / $width;
						$thumbheight = $height * $thumbaspectratio;
						$thumbwidth = $thumbmaxwidth;
						$yletterbox = round(($thumbmaxheight - $thumbheight) / 2);
					}

					/* Generate the resized image (as JPG) */
					$thumbimage = imagecreatetruecolor($thumbmaxwidth, $thumbmaxheight);
					$bgcolor = imagecolorallocate($thumbimage, $Rimgbackgroundcolor, $Gimgbackgroundcolor, $Bimgbackgroundcolor);
					imagefill($thumbimage, 0, 0, $bgcolor);
					imagecopyresampled($thumbimage, $imgdata, $xletterbox, $yletterbox, 0, 0, $thumbwidth, $thumbheight, $width, $height);
					imagejpeg($thumbimage, $filePath . "/" . $thumbfilename, 90);
					imagedestroy($thumbimage);
				}
				else {
					/* We do not have a gif, jpeg, png or xbm file to work with */
					$err_msg = "The image needs to be in either a GIF, JPEG, PNG or XBM format.";
				}
			} /* END: if (strlen($err_status) == 0) */
			else {
				/* A problem occurred attempting to retrieve the file */
				$err_msg = "An error occurred: " . $err_status . ".";
			}
			/* Remove temporary file, if present */
			if (file_exists($tempfilelocation)) { unlink($tempfilelocation); }
		} /* END: if (strlen($itemimageurl) > 0) */
		else {
			/* The URL location to the file does not appear to have been included */
			$err_msg = "The URL to the image does not appear to have been included or is improperly formatted.";
		}
//print $err_msg;


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