<?php

	/*
		Image Output Script
		---------------------------------------------
		David Book, buzztouch.com
		04/26/2010
		---------------------------------------------

		
		THERE ARE NO SECURITY MEASURES TAKEN IN THIS SCRIPT. It is your responsibility to ensure the data
		you process does not harm your backend systems. 
	
		The logic:
			a) Read a directory of images from a folder.
			b) Output the contents in JSON format for cosumption by the mobile device.
	*/
	
	
	//each image needs a unique BT_itemId, use this function to create one
	function fnCreateGuid(){
		$RandomStr_1 = md5(microtime()); 
		$RandomStr_2 = md5(microtime()); 
		$randomString = substr($RandomStr_2, 4, 4) . substr($RandomStr_1, 0, 15); 
		return $randomString;
	}	
	
	
	//start the JSON output
	$JSON = "{\"childItems\":[";
			
		//it's assumed that this file is in the same directory as the images. Change imgDir if the images are elsewhere.
		$imgDir = ".";
		if(is_dir($imgDir)){
			if($handle = opendir($imgDir)){
				while (false !== ($file = readdir($handle))) {
					if(strlen($file) > 5){
					
						//image files must end with .jpg, .jpgeg or .png
						$ext = substr(strrchr($file, '.'), 1);
						
						if(strtoupper($ext) == "JPG" || strtoupper($ext) == "JPEG" || strtoupper($ext) == "PNG"){
					
							$JSON .= "\n{\"itemId\":\"" . strtoupper(fnCreateGuid()) . "\",";
							$JSON .= "\"itemType\":\"BT_imageItem\", ";
							$JSON .= "\"imageName\":\"" . $file . "\",";
							$JSON .=" \"imageURL\":\"http://www.yoursite.com/imageFolder/" . $file . "\"},";
					
						}
						
					}
				}
			}										
		}	
	
	//remove the comma after last image so JSON is valid
	$JSON = trim($JSON);
	if(substr(strtoupper($JSON), (strlen($JSON) - 1), 1) == ","){
		$JSON = substr($JSON, 0, strlen($JSON) - 1);
	}	
	
	//end the JSON
	$JSON .= "\n]}";					
	
	//print the output
	echo $JSON;
	exit();
	
?>