In what scenarios can the error "Function name must be a string" occur in PHP, and how can it be debugged effectively?

The error "Function name must be a string" in PHP occurs when a non-string value is passed as a function name in a function call. To debug this issue effectively, check the variable being used as the function name to ensure it is a string and contains the correct function name. 

// Incorrect function call with a non-string function name
$functionName = 123;
$result = $functionName(); // Error: Function name must be a string

// Corrected function call with a valid string function name
$functionName = 'myFunction';
$result = $functionName(); // Call to myFunction() function

Keywords

PHP function name string debugging error

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