站长论坛

标题: php的register_shutdown_function函数详解 [打印本页]

作者: ajax 时间: 2008-10-25 23:38
标题: php的register_shutdown_function函数详解
PHP提供register_shutdown_function()这个函数，能够在脚本终止前回调注册的函数

register_shutdown_function例子代码:

<?php
function Test()
{    if(!file_exists('Test.txt')){    //判断如果文件不存在!!
echo '文件不存在,我要创建一个:';
      $Str = fopen('Test.txt',"w+");
      fwrite($Str,'you are write after exit');
      fclose($Str);
echo "创建完成!";
}else {                         //如果存在;
      echo '文件已经存在';
}
}
register_shutdown_function('Test');
for($i=0;$i<10;$i++){
echo "Echo<br/>";
}
exit;
?>

There is a note "Shutdown function is called during the script shutdown so headers are always already sent.", but my php 5.1 seems to act differently.
Example:

<?php
class Test {

private $running;

public function main() {
   $this->running = true;
   ob_start();
   error_reporting(E_ALL);
   register_shutdown_function(array($this, "clean_exit"));
   echo "Hello";
   // triggers E_ERROR
   $fatal->error();

   $this->running = false;
}

public function clean_exit() {
   if ($this->running) {
         header("Location: error.php");
   }
}
}
$t = new Test();
$t->main();
?>
This example redirects you on error.php, this could be a simple way to handle E_ERROR.

欢迎光临站长论坛 (http://tzlink.com/bbs/)