How to Find the Definition Location of a Function in PHP?

Determining Function Definition Location

In the realm of computer programming, tracing the origins of a function can be essential for debugging, code comprehension, and refactoring. Fortunately, in PHP, there are several ways to uncover the file and line number where a function is defined.

One approach involves leveraging PHP's native reflection capabilities:

$reflFunc = new ReflectionFunction('function_name');
print $reflFunc->getFileName() . ':' . $reflFunc->getStartLine();

This snippet instantiates a ReflectionFunction object and subsequently retrieves both the filename and starting line of the target function. The resulting output will provide a precise indication of its definition location.

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