Survive in php.. a logger method.

function logger($msg){
 if(!isset($GLOBALS['logger'])){
  $GLOBALS['logger'] = fopen("/var/www/apps/logs/dev.log","a");
 }
 fwrite($GLOBALS['logger'],"$msg\n");
}

function request($id = ''){
  logger("dir/file.php::request(id[".$id."])");
...
}