[英]Can I Try-Catch PHP Warnings while loading an html file into DOMDocument?
Is it possible to do some sort of try catch that will catch warnings? 是否可以进行某些尝试捕获警告的尝试?
eg 例如
if (!$dom->loadHTMLFile($url)) {
//if cant load file handle error my way
}
For the $url
I am using I am getting 对于我正在使用的
$url
我正在
Warning (2): DOMDocument::loadHTMLFile(MYURL) [domdocument.loadhtmlfile]: failed to open stream: HTTP request failed!
警告(2):DOMDocument :: loadHTMLFile(MYURL)[domdocument.loadhtmlfile]:无法打开流:HTTP请求失败! HTTP/1.0 403 Forbidden [APP\\controllers\\import_controller.php, line 62]
HTTP / 1.0 403禁止[APP \\ controllers \\ import_controller.php,第62行]
Warning (2): DOMDocument::loadHTMLFile() [domdocument.loadhtmlfile]: I/O warning : failed to load external entity "hMYURL" [APP\\controllers\\import_controller.php, line 62]
警告(2):DOMDocument :: loadHTMLFile()[domdocument.loadhtmlfile]:I / O警告:无法加载外部实体“ hMYURL” [APP \\ controllers \\ import_controller.php,第62行]
I could just suppress the error with @
, and do something if the call returns false
, but I want to be able to catch the exact warning message and then do something with it. 我可以使用
@
抑制错误,并在调用返回false
执行某些操作,但是我希望能够捕获确切的警告消息,然后对其进行处理。
Is this possible? 这可能吗?
You should use libxml_use_internal_errors
for this. 您应该为此使用
libxml_use_internal_errors
。
This example is adapted from the manual: 此示例摘自手册:
libxml_use_internal_errors(true);
$doc = new DOMDocument();
$res = $doc->loadHTMLFile($url); //this may fail and return FALSE!
foreach (libxml_get_errors() as $error) {
// handle errors here
}
libxml_clear_errors();
No PHP notices will be emitted here. 没有PHP的通知将在这里发出。
Probably you are looking for this 可能您正在寻找这个
<?php
// error handler function
function myErrorHandler($errno, $errstr, $errfile, $errline)
{
switch ($errno) {
case E_USER_ERROR:
echo "<b>My ERROR</b> [$errno] $errstr<br />\n";
echo " Fatal error on line $errline in file $errfile";
echo ", PHP " . PHP_VERSION . " (" . PHP_OS . ")<br />\n";
echo "Aborting...<br />\n";
exit(1);
break;
case E_USER_WARNING:
echo "<b>My WARNING</b> [$errno] $errstr<br />\n";
break;
case E_USER_NOTICE:
echo "<b>My NOTICE</b> [$errno] $errstr<br />\n";
break;
default:
echo "Unknown error type: [$errno] $errstr<br />\n";
break;
}
/* Don't execute PHP internal error handler */
return true;
}
// function to test the error handling
function scale_by_log($vect, $scale)
{
if (!is_numeric($scale) || $scale <= 0) {
trigger_error("log(x) for x <= 0 is undefined, you used: scale = $scale", E_USER_ERROR);
}
if (!is_array($vect)) {
trigger_error("Incorrect input vector, array of values expected", E_USER_WARNING);
return null;
}
$temp = array();
foreach($vect as $pos => $value) {
if (!is_numeric($value)) {
trigger_error("Value at position $pos is not a number, using 0 (zero)", E_USER_NOTICE);
$value = 0;
}
$temp[$pos] = log($scale) * $value;
}
return $temp;
}
// set to the user defined error handler
$old_error_handler = set_error_handler("myErrorHandler");
// trigger some errors, first define a mixed array with a non-numeric item
echo "vector a\n";
$a = array(2, 3, "foo", 5.5, 43.3, 21.11);
print_r($a);
// now generate second array
echo "----\nvector b - a notice (b = log(PI) * a)\n";
/* Value at position $pos is not a number, using 0 (zero) */
$b = scale_by_log($a, M_PI);
print_r($b);
// this is trouble, we pass a string instead of an array
echo "----\nvector c - a warning\n";
/* Incorrect input vector, array of values expected */
$c = scale_by_log("not array", 2.3);
var_dump($c); // NULL
// this is a critical error, log of zero or negative number is undefined
echo "----\nvector d - fatal error\n";
/* log(x) for x <= 0 is undefined, you used: scale = $scale" */
$d = scale_by_log($a, -2.5);
var_dump($d); // Never reached
?>
this will make this output: 这将产生以下输出:
vector a
Array
(
[0] => 2
[1] => 3
[2] => foo
[3] => 5.5
[4] => 43.3
[5] => 21.11
)
----
vector b - a notice (b = log(PI) * a)
<b>My NOTICE</b> [1024] Value at position 2 is not a number, using 0 (zero)<br />
Array
(
[0] => 2.2894597716988
[1] => 3.4341896575482
[2] => 0
[3] => 6.2960143721717
[4] => 49.566804057279
[5] => 24.165247890281
)
----
vector c - a warning
<b>My WARNING</b> [512] Incorrect input vector, array of values expected<br />
NULL
----
vector d - fatal error
<b>My ERROR</b> [256] log(x) for x <= 0 is undefined, you used: scale = -2.5<br />
Fatal error on line 35 in file trigger_error.php, PHP 5.2.1 (FreeBSD)<br />
Aborting...<br />
You might be able to use a custom error handler but I am not completely sure if the warnings you get can be handled. 您也许可以使用自定义错误处理程序,但是我不确定是否可以处理您收到的警告。 Some errors or warnings will always use the default error handler.
某些错误或警告将始终使用默认错误处理程序。 But just try it out.
但是,请尝试一下。
I just found a very attractive solution at http://bytes.com/topic/php/answers/6296-catch-warnings : 我刚刚在http://bytes.com/topic/php/answers/6296-catch-warnings找到了一个非常有吸引力的解决方案:
First tell PHP to track all errors: 首先告诉PHP跟踪所有错误:
ini_set('track_errors', '1');
This puts all error messages (incl. warnings) into the variable $php_errormsg
(see http://www.php.net/manual/en/errorfunc.configuration.php#ini.track-errors ). 这会将所有错误消息(包括警告)放入变量
$php_errormsg
(请参阅http://www.php.net/manual/zh-CN/errorfunc.configuration.php#ini.track-errors )。
Then you can catch errors and warnings like this: 然后,您可以捕获这样的错误和警告:
if (!@copy('no_file', 'some_file')) {
echo $php_errormsg, "\n";
}
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