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* Update book.xml * Update ini.xml * Update constants.xml * Update examples.xml * Update reference.xml * Update ini.xml * Update ini.xml
144 lines
4.5 KiB
XML
144 lines
4.5 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: fa6e196973e45c0013c0801e01697757f4b98426 Maintainer: mowangjuanzi Status: ready -->
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<appendix xml:id="errorfunc.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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&reftitle.examples;
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<para>
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下面我们可以看到错误处理功能在 PHP 中的使用的示例。定义错误处理函数，记录错误信息到文件中（使用 XML 格式），并在发生严重错误时向开发人员发送电子邮件。
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<example>
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<title>在脚本中使用错误句柄</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// 我们将要定义自己的错误处理
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error_reporting(0);
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// 用户自定义错误处理函数
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function userErrorHandler($errno, $errmsg, $filename, $linenum, $vars)
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{
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// 错误发生的时间
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$dt = date("Y-m-d H:i:s (T)");
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// 定义错误字符串的关联数组
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// 在这里我们只考虑
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// E_WARNING, E_NOTICE, E_USER_ERROR,
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// E_USER_WARNING 和 E_USER_NOTICE
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$errortype = array (
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E_ERROR => 'Error',
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E_WARNING => 'Warning',
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E_PARSE => 'Parsing Error',
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E_NOTICE => 'Notice',
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E_CORE_ERROR => 'Core Error',
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E_CORE_WARNING => 'Core Warning',
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E_COMPILE_ERROR => 'Compile Error',
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E_COMPILE_WARNING => 'Compile Warning',
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E_USER_ERROR => 'User Error',
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E_USER_WARNING => 'User Warning',
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E_USER_NOTICE => 'User Notice',
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E_STRICT => 'Runtime Notice',
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E_RECOVERABLE_ERROR => 'Catchable Fatal Error'
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);
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// 设置要保存变量跟踪信息的错误类别
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$user_errors = array(E_USER_ERROR, E_USER_WARNING, E_USER_NOTICE);
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$err = "<errorentry>\n";
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$err .= "\t<datetime>" . $dt . "</datetime>\n";
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$err .= "\t<errornum>" . $errno . "</errornum>\n";
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$err .= "\t<errortype>" . $errortype[$errno] . "</errortype>\n";
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$err .= "\t<errormsg>" . $errmsg . "</errormsg>\n";
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$err .= "\t<scriptname>" . $filename . "</scriptname>\n";
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$err .= "\t<scriptlinenum>" . $linenum . "</scriptlinenum>\n";
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if (in_array($errno, $user_errors)) {
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$err .= "\t<vartrace>" . wddx_serialize_value($vars, "Variables") . "</vartrace>\n";
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}
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$err .= "</errorentry>\n\n";
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// for testing
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// echo $err;
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// 记录错误信息到错误日志，并在发生关键用户错误时发送电子邮件
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error_log($err, 3, "/usr/local/php4/error.log");
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if ($errno == E_USER_ERROR) {
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mail("phpdev@example.com", "Critical User Error", $err);
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}
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}
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function distance($vect1, $vect2)
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{
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if (!is_array($vect1) || !is_array($vect2)) {
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trigger_error("Incorrect parameters, arrays expected", E_USER_ERROR);
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return NULL;
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}
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if (count($vect1) != count($vect2)) {
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trigger_error("Vectors need to be of the same size", E_USER_ERROR);
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return NULL;
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}
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for ($i=0; $i<count($vect1); $i++) {
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$c1 = $vect1[$i]; $c2 = $vect2[$i];
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$d = 0.0;
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if (!is_numeric($c1)) {
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trigger_error("Coordinate $i in vector 1 is not a number, using zero",
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E_USER_WARNING);
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$c1 = 0.0;
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}
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if (!is_numeric($c2)) {
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trigger_error("Coordinate $i in vector 2 is not a number, using zero",
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E_USER_WARNING);
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$c2 = 0.0;
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}
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$d += $c2*$c2 - $c1*$c1;
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}
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return sqrt($d);
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}
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$old_error_handler = set_error_handler("userErrorHandler");
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// 未定义的常量，将产生一个警告
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$t = I_AM_NOT_DEFINED;
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// 定义一些 "载体"
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$a = array(2, 3, "foo");
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$b = array(5.5, 4.3, -1.6);
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$c = array(1, -3);
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// 引发一个用户错误
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$t1 = distance($c, $b) . "\n";
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// 再次引发一个用户错误
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$t2 = distance($b, "i am not an array") . "\n";
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// 引发一个警告
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$t3 = distance($a, $b) . "\n";
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</appendix>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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