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How can I find out where a function is defined using PHP?

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To get the location of a function in PHP, we can use the built-in ReflectionFunction()class. When the name of a function for which we need details is passed to the class constructor, it gets a few details about that function.
  • getFileName:returns the location of the function file.
  • getNumberOfParameters:returns the number of parameters passed to the function.
  • getStartLine:returns the start line of the function.
Syntax:
$details = new ReflectionFunction (’function_name’);
Then use the above functions to access whatever you need. Paste the code below into your main code for details on this feature. $details = new ReflectionFunction ( ’printing’ ); print $details -> getFileName(). ’:’ . $details -> getStartLine(); ?> Steps to run the code:
  • Create a file named file_name.php
  • Copy the above code to a file.
  • Save the file to your local server. For WampServer, find the "www" folder inside the "wamp64" folder on drive C and save the file there.
  • Start your Wamp server.
  • Open any browser and enter localhost / fun. php to get the following output.
Output :
C: wamp64wwwfile_name.php: 2
Below are Examples of ReflectionFunctions in PHP:Example 1:Suppose we want to find the location of the print function in this code. You can see the filename and location of the print function in the output. function printing() { echo ’Welcome to GeeksforGeeks’ ; } $details = new ReflectionFunction ( ’printing’ ); echo ’File location:’ . $details -> getFileName(). ’, Starting line:’ . $details -> getStartLine(). ’, Parametrs passed:’ . $details -> getNumberOfParameters(); ?> Output:
File location: /home/7de5f19b219d214c719df5f3839a7f61.php, Starting line: 2, Parametrs passed: 0
Example 2:Suppose in this code we want to find a location features ’ engineer & # 39 ;. In the output, you can see the filename, location, start line, and parameter passed by fans to the function. function printing() { echo ’Welcome to GeeksforGeeks’ ; } function engineer() { echo ’This is the article How to find out where a function is defined using PHP? ’; } $details = new ReflectionFunction ( ’engineer’ ); print ’ File location: ’ . $details -> getFileName(). ’Starting line:’ . $details -> getStartLine(). ’No. of parametrs passed: ’ . $details -> getNumberOfParameters() ;  
?>
Output:
File location: /home/dd96d70bdf5ff03fea0ea24110bae9ff.php Starting line: 7 No. of parametrs passed: 0

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