debugging - PHP - recognize when the function was called -

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i'm thinking how find function called. problem need find php calling mail() function. 1 way use register_tick_function(), i'll need open each file , check on each line. project huge, take long parse each file in php. other way? or option how override mail() function?

to override built-in mail function, take @ override_function part of advanced php debugger pecl extension - can use debug_backtrace find out caller details...

//define code override mail function (note i've used php5.3 nowdoc syntax avoid  //the need escape dollar symbols!! $code=<<<'code'     $trace=debug_backtrace();     $caller=array_shift($trace);      echo 'mail() called '.$caller['function']     if (isset($caller['class']))         echo 'in '.$caller['class']; code;  //install override override_function('mail', '$to,$subject,$msg,$hdrs,$params', $code);

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