Web Reference: PHP supports the concept of variable functions. This means that if a variable name has parentheses appended to it, PHP will look for a function with the same name as whatever the variable evaluates to, and will attempt to execute it. Variable functions provide powerful dynamic programming capabilities in PHP. They're essential for building flexible applications with callbacks, function tables, and runtime function selection while maintaining clean, readable code. Output Variables The PHP echo keyword is often used to output data to the screen. The following example will show how to output some text and the value of a variable:
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