假设我正在运行外部脚本，我没有访问权限(请注意，这个问题不是问这样做的安全风险是什么)，我希望它在2秒内停止，无论什么
当然，我不想为了这样做而承认我的php.ini。我也不想禁用安全模式来启用set_time_limit。
是否有一个不影响性能的解决方案?
我注意性能以避免回答建议将代码作为字符串和评估它每个部分。一般来说，性能不重要。
我创建了一个简单的类，按照@Mark Baker的建议使用tick来完成任务。如果有任何改进建议，我也会在GitHub上放置。
declare(ticks=1);
//You don't need to use that function
function set_time_limit_safe($limit) {
if(!is_numeric($limit))
trigger_error("set_time_limit_safe() expects parameter 1 to be numeric value, ". gettype($limit)." given", E_USER_WARNING);
TimeLimit::set($limit);
}
//I'm using class to have the possibility of private static that's shared between both
//set function and the callback
class TimeLimit {
//Default value for limit
private static $limit = 30;
//When the limit is registered, this is set to current time for later comparisons
private static $reg_time = -1;
//Boolean to determine whether callback is already registered or not
private static $registered = false;
/**
* Sets the time limit and registers callback
* @param float $limit limiting time in seconds
* @return null
**/
public static function set($limit) {
//echo "Setting time limit!<br />";
self::$limit = $limit;
//Seconds as float
self::$reg_time = microtime(true);
//Only register once
if(!self::$registered) {
register_tick_function(array('TimeLimit', 'tick_cb'));
//echo "Registering tick function!<br />";
self::$registered = true;
}
}
/**
* The callback
* You can disable the limit by unregistering this function
**/
public static function tick_cb() {
$time = microtime(true);
//echo "Tick!!!<br />";
if($time-self::$reg_time>=self::$limit) {
trigger_error("User defined maximum execution time of ".self::$limit." seconds exceeded.", E_USER_ERROR);
//In case error callback had let the error through
exit;
}
}
}
//Testing code
set_time_limit_safe(1.5);
while(true) {
}
我需要知道如何绕过这个