debug_backtrace and FILE/LINE indices

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  • Taras_96
    #1

    debug_backtrace and FILE/LINE indices

    Hi all,

    I've been using debug_backtrace () for a while to provide stack traces
    for a custom logging function. Today was the first time I've got the
    following error:

    "Notice: Undefined index: file in E:\webroot\lib\ errors.php on line
    341

    Notice: Undefined index: line in E:\webroot\lib\ errors.php on line
    341"

    related to the following code:

    $vDebug = debug_backtrace ();
    $vFiles = array();
    for ($i=0;$i<count( $vDebug);$i++) {
    // skip the first one, since it's always this func
    if ($i==0) { continue; }
    $aFile = $vDebug[$i];
    var_dump($aFile );
    $vFiles[] = '('.basename($a File['file']).':'.
    $aFile['line'].')';
    } // for
    return implode(',',$vF iles);

    I checked the PHP documentation for this function, and to my surprise
    found that:

    "The *possible* returned elements are as follows:", ie: 'file' and
    'line' wont always be returned. When are these elements returned, so
    that I can make the function do something useful when file/line isn't
    returned?

    Thanks

    Taras

    Tags: None
    • Thomas Mlynarczyk
      #2
      Re: debug_backtrace and FILE/LINE indices

      Also sprach Taras_96:
      $vDebug = debug_backtrace ();
      $vFiles = array();
      for ($i=0;$i<count( $vDebug);$i++) {
      // skip the first one, since it's always this func
      if ($i==0) { continue; }
      $aFile = $vDebug[$i];
      var_dump($aFile );
      $vFiles[] = '('.basename($a File['file']).':'.
      $aFile['line'].')';
      } // for
      return implode(',',$vF iles);
      >
      I checked the PHP documentation for this function, and to my surprise
      found that:
      >
      "The *possible* returned elements are as follows:", ie: 'file' and
      'line' wont always be returned. When are these elements returned, so
      that I can make the function do something useful when file/line isn't
      returned?
      A workaround: If 'file' and 'line' are not returned, use the respective
      values from the next entry in the backtrace array. Here's what I use:

      $aTrace = debug_backtrace ();
      // Loop backwards (!) through array
      for ( $sFile = '', $iLine = 0, $i = count( $aTrace ); $i--; )
      {
      // Make sure all fields are set
      $aTrace[$i]
      = array_merge(
      array(
      'function' ='',
      'type' ='',
      'class' ='',
      'object' =array(),
      'args' =array(),
      'file' =$sFile,
      'line' =$iLine
      ),
      $aTrace[$i]
      );

      // Add this for convenience
      $aTrace[$i]['call']
      = $aTrace[$i]['class']
      . $aTrace[$i]['type']
      . $aTrace[$i]['function'];

      // Missing file or line? Copy from previous item
      $sFile = $aTrace[$i]['file'];
      $iLine = $aTrace[$i]['line'];
      }

      // Remove first item ("this function")
      array_shift( $aTrace );

      This way, all possible fields are set to useful values. If you're only
      interested in file and line, you can optimize the code of course.

      Greetings,
      Thomas



        Comment

        • Taras_96
          #3
          Re: debug_backtrace and FILE/LINE indices

          Thanks Thomans, I'll try out your suggestion and see how it goes :).

          Taras

          On Apr 25, 5:01 am, "Thomas Mlynarczyk" <tho...@mlynarc zyk-
          webdesign.dewro te:
          Also sprach Taras_96:
          >
          >
          >
          $vDebug = debug_backtrace ();
          $vFiles = array();
          for ($i=0;$i<count( $vDebug);$i++) {
          // skip the first one, since it's always this func
          if ($i==0) { continue; }
          $aFile = $vDebug[$i];
          var_dump($aFile );
          $vFiles[] = '('.basename($a File['file']).':'.
          $aFile['line'].')';
          } // for
          return implode(',',$vF iles);
          >
          I checked the PHP documentation for this function, and to my surprise
          found that:
          >
          "The *possible* returned elements are as follows:", ie: 'file' and
          'line' wont always be returned. When are these elements returned, so
          that I can make the function do something useful when file/line isn't
          returned?
          >
          A workaround: If 'file' and 'line' are not returned, use the respective
          values from the next entry in the backtrace array. Here's what I use:
          >
          $aTrace = debug_backtrace ();
          // Loop backwards (!) through array
          for ( $sFile = '', $iLine = 0, $i = count( $aTrace ); $i--; )
          {
          // Make sure all fields are set
          $aTrace[$i]
          = array_merge(
          array(
          'function' ='',
          'type' ='',
          'class' ='',
          'object' =array(),
          'args' =array(),
          'file' =$sFile,
          'line' =$iLine
          ),
          $aTrace[$i]
          );
          >
          // Add this for convenience
          $aTrace[$i]['call']
          = $aTrace[$i]['class']
          . $aTrace[$i]['type']
          . $aTrace[$i]['function'];
          >
          // Missing file or line? Copy from previous item
          $sFile = $aTrace[$i]['file'];
          $iLine = $aTrace[$i]['line'];
          }
          >
          // Remove first item ("this function")
          array_shift( $aTrace );
          >
          This way, all possible fields are set to useful values. If you're only
          interested in file and line, you can optimize the code of course.
          >
          Greetings,
          Thomas

            Comment

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