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.
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