问当使用等于条件快捷方式的变量时，最近更新的PHP 5.4从5.3崩溃

EN

# retrieve caller name
$calledby = debug_backtrace(); print_r($calledby);
$caller = (strlen($calledby[1]['class'])) ? $calledby[1]['class'] : $calledby[0]['class'];
# arguments are required
if (!func_num_args()) { return; }
# fill variables with argument contents if exists
$variables = (func_num_args() == 0) ? NULL : (is_array(func_get_arg(0)) ? func_get_arg(0) : NULL);

if (strlen($calledby[1]['class']))  $caller = $calledby[1]['class'];
else                                $caller = $calledby[0]['class'];