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    PHP – get calling file name and line number using debug_backtrace

    By admin on Jan 29, 2016

    Sometime it is useful to log the calling filename and line number details of the calling file/function in php. One common use case if to have a common logging function which logs calling filename detail for better debugging/troubleshooting. Here is an example.

    File used for this example:

    <?php
    function f1() {
      $fileinfo = 'no_file_info';
      $backtrace = debug_backtrace();
      if (!empty($backtrace[0]) && is_array($backtrace[0])) {
        $fileinfo = $backtrace[0]['file'] . ":" . $backtrace[0]['line'];
      }
      echo "calling file info: $fileinfo\n";
    }
    ?>

    Here is example code and its outcome which uses util.php function f1().

    <?php
    require "util.php";
    f1()
    ?>
    calling file info: test.php:3
    
    Env: PHP 7.3.18 (Linux)

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    Posted in Tutorials | Tagged PHP, PHP cookbook, Tutorials

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