[英]Can I Try-Catch PHP Warnings while loading an html file into DOMDocument?
是否可以進行某些嘗試捕獲警告的嘗試?
例如
if (!$dom->loadHTMLFile($url)) {
//if cant load file handle error my way
}
對於我正在使用的$url
我正在
警告(2):DOMDocument :: loadHTMLFile(MYURL)[domdocument.loadhtmlfile]:無法打開流:HTTP請求失敗! HTTP / 1.0 403禁止[APP \\ controllers \\ import_controller.php,第62行]
警告(2):DOMDocument :: loadHTMLFile()[domdocument.loadhtmlfile]:I / O警告:無法加載外部實體“ hMYURL” [APP \\ controllers \\ import_controller.php,第62行]
我可以使用@
抑制錯誤,並在調用返回false
執行某些操作,但是我希望能夠捕獲確切的警告消息,然后對其進行處理。
這可能嗎?
您應該為此使用libxml_use_internal_errors
。
此示例摘自手冊:
libxml_use_internal_errors(true);
$doc = new DOMDocument();
$res = $doc->loadHTMLFile($url); //this may fail and return FALSE!
foreach (libxml_get_errors() as $error) {
// handle errors here
}
libxml_clear_errors();
沒有PHP的通知將在這里發出。
可能您正在尋找這個
<?php
// error handler function
function myErrorHandler($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($d); // Never reached
?>
這將產生以下輸出:
vector a
Array
(
[0] => 2
[1] => 3
[2] => foo
[3] => 5.5
[4] => 43.3
[5] => 21.11
)
----
vector b - a notice (b = log(PI) * a)
<b>My NOTICE</b> [1024] Value at position 2 is not a number, using 0 (zero)<br />
Array
(
[0] => 2.2894597716988
[1] => 3.4341896575482
[2] => 0
[3] => 6.2960143721717
[4] => 49.566804057279
[5] => 24.165247890281
)
----
vector c - a warning
<b>My WARNING</b> [512] Incorrect input vector, array of values expected<br />
NULL
----
vector d - fatal error
<b>My ERROR</b> [256] log(x) for x <= 0 is undefined, you used: scale = -2.5<br />
Fatal error on line 35 in file trigger_error.php, PHP 5.2.1 (FreeBSD)<br />
Aborting...<br />
您也許可以使用自定義錯誤處理程序,但是我不確定是否可以處理您收到的警告。 某些錯誤或警告將始終使用默認錯誤處理程序。 但是,請嘗試一下。
我剛剛在http://bytes.com/topic/php/answers/6296-catch-warnings找到了一個非常有吸引力的解決方案:
首先告訴PHP跟蹤所有錯誤:
ini_set('track_errors', '1');
這會將所有錯誤消息(包括警告)放入變量$php_errormsg
(請參閱http://www.php.net/manual/zh-CN/errorfunc.configuration.php#ini.track-errors )。
然后,您可以捕獲這樣的錯誤和警告:
if (!@copy('no_file', 'some_file')) {
echo $php_errormsg, "\n";
}
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