Posted by Thomas Mlynarczyk on 04/24/07 20:01

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);
> $vFiles[] = '('.basename($aFile['file']).':'.
> $aFile['line'].')';
> } // for
> return implode(',',$vFiles);
>
> 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

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