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What are the Limitations of Variable Naming?

Some main limitations of Variable Naming in PHP are given below:

1.In PHP their is not a fixed limit for Variable Name as compare to other programing language. 

2.First letter of PHP Variable must start with a letters,numbers or underscore \"_\". 

3.Variable Name should be a combination of Alpha-Numeric Characters or underscores(a-z,A-Z,0-9or_) 

4.Variable name must be one word.If their is more than one word in our Variable Name.Than we can distinguish them with underscore(\"_\").Like $first_name.

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