PHP libxml函数

PHP libxml_get_errors() 函数从 libxml 错误缓冲区获取错误。

语法

libxml_get_errors()

参数

不需要参数。

返回值

返回一个数组，其中LibXMLError 对象（如果缓冲区中有任何错误），否则为空数组。

示例:libxml_get_errors() 示例

下面的示例显示了libxml_get_errors()函数的用法。

<?php
libxml_use_internal_errors(true);

//包含不匹配的标签
$xmlstr = <<<XML
<mail> 
  <To>John Smith</too>
  <From>Marry G.</From>
  <Subject>Happy Birthday</Subject>
  <body>Happy birthday. Live your life with smiles.</Body>
</mail> 
XML;

$doc = simplexml_load_string($xmlstr);
$xml = explode("\n", $xmlstr);

if ($doc === false) {
  $errors = libxml_get_errors();

  //显示发生错误
  print_r($errors);

  //清除libxml错误缓冲区
  libxml_clear_errors();
}
?>

上述代码的输出将是:

Array
(
    [0] => LibXMLError Object
        (
            [level] => 3
            [code] => 76
            [column] => 23
            [message] => Opening and ending tag mismatch: To line 2 and too

            [file] => 
            [line] => 2
        )

    [1] => LibXMLError Object
        (
            [level] => 3
            [code] => 76
            [column] => 59
            [message] => Opening and ending tag mismatch: body line 2 and Body

            [file] => 
            [line] => 5
        )

)

示例:构建一个简单的错误处理程序

下面的示例展示了如何构建一个简单的 libxml 错误处理程序。

<?php
libxml_use_internal_errors(true);

//包含不匹配的标签
$xmlstr = <<<XML
<mail> 
  <To>John Smith</too>
  <From>Marry G.</From>
  <Subject>Happy Birthday</Subject>
  <body>Happy birthday. Live your life with smiles.</Body>
</mail> 
XML;

$doc = simplexml_load_string($xmlstr);
$xml = explode("\n", $xmlstr);

if ($doc === false) {
  $errors = libxml_get_errors();

  //显示发生错误
  foreach ($errors as $error) {
    echo display_xml_error($error, $xml)."\n";
  }

  //清除libxml错误缓冲区
  libxml_clear_errors();
}

//显示错误信息的函数
function display_xml_error($error, $xml) {
  $message = "";
  switch ($error->level) {
    case LIBXML_ERR_WARNING:
      $message .= "Warning $error->code: ";
      break;
    case LIBXML_ERR_ERROR:
      $message .= "Error $error->code: ";
      break;
    case LIBXML_ERR_FATAL:
      $message .= "Fatal Error $error->code: ";
      break;
  }

  $message .= trim($error->message) .
    "\n Line: $error->line" .
    "\n Column: $error->column";

  if ($error->file) {
    $message .= "\n File: $error->file";
  }

    return $message;
}
?>

上述代码的输出将是:

Fatal Error 76: Opening and ending tag mismatch: To line 2 and too
 Line: 2
 Column: 23
Fatal Error 76: Opening and ending tag mismatch: body line 2 and Body
 Line: 5
 Column: 59