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 in PHP allow you to call a function dynamically by storing its name in a variable. When you append parentheses to a variable containing a function name, PHP executes that function. In PHP7, dynamic variables, properties, and methods will now be evaluated strictly in left-to-right order, as opposed to the mix of special cases in PHP5. The examples below show how the order of evaluation has changed.
YouTube Excerpt: Variable Functions
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Last Updated: April 8, 2026
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