O'Reilly logo

PHP and MySQL Recipes: A Problem-Solution Approach, Second Edition by Frank M. Kromann

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

© Frank M. Kromann 2016

Frank M. Kromann, PHP and MySQL Recipes, 10.1007/978-1-4842-0605-8_10

10. Variables

Frank M. Kromann

(1)Trabuco Canyon, California, USA

Variables are used to store data temporarily in memory. Variables only exist as long as the PHP script is running. They are identified with a dollar sign followed by a name. The name of a variable can begin with a letter (a-z or A-Z) or an underscore. Any of the following characters can be a number, a letter, or any ASCII character from 127 to 255 (0x7f – 0xff). There is no restriction on the number of characters in the name. Variable names are case sensitive so $var, $Var, and $VAR will be three different variables.

PHP is a loosely typed language where variables can change type depending ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required