Welcome, what is variable in PHP in Hindi. How to declare a variable in PHP in Hindi. Creating (Declaring) PHP Variables. In PHP, a variable starts with the $ sign, followed by the name of the variable. PHP Variables Rules or How to create variables in PHP. A​ ​variable​ ​in​ ​PHP​ ​always​ ​starts​ ​with​ ​a​ ​dollar​ ​sign​ ​$. It​ ​must​ ​then​ ​contain​ ​a​ ​LETTER​ ​or​ ​UNDERSCORE. It​ ​can​ ​then​ ​contain​ ​any​ ​of​ ​the​ ​following​ ​characters: a​ ​b​ ​c​ ​d​ ​e​ ​f​ ​g​ ​h​ ​i​ ​j​ ​k​ ​l​ ​m​ ​n​ ​o​ ​p​ ​q​ ​r​ ​s​ ​t​ ​u​ ​v​ ​w​ ​x​ ​y​ ​z A​ ​B​ ​C​ ​D​ ​E​ ​F​ ​G​ ​H​ ​I​ ​J​ ​K​ ​L​ ​M​ ​N​ ​O​ ​P​ ​Q​ ​R​ ​S​ ​T​ ​U​ ​V​ ​W​ ​X​ ​Y​ ​Z 1​ ​2​ ​3​ ​4​ ​5​ ​6​ ​7​ ​8​ ​9 _ (this is ​ an ​ underscore) So,​ ​a​ ​variable​ ​can​ ​contain​ ​any​ ​number​ ​of​ ​letters,​ ​numbers​ ​or​ ​underscores​ ​but​ ​must​ ​start​ ​with​ ​a​ ​letter​ ​or underscore.