Define PHP Variable names
{"Image DocumentName": "Define PHP Variable names", "Image ImageDescription": "use characters, number, underscore and    var_name. - first character must not be number. - don\u2019t use name as same as built-in. functions or any keyword.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}