This video will explain you the PHP variable and PHP functions

PHP functions are similar to other programming languages. A function is a piece of code which takes one more input in the form of parameter and does some processing and returns a value. … They are built-in functions but PHP gives you option to create your own functions as well

Why do PHP (and many other languages) variables start with a dollar sign? The leading $ symbol before a variable name is called a sigil. Its purpose is to make it clear that the name following the sigil is a variable and not something else, like a function name or a constant or a keyword

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