的XPath搜索PHP

我不断收到以下错误消息的XPath搜索PHP

Notice: Undefined index: txtSearch in  /var/www/vhosts/numyspace.co.uk/web_users/home/~unn_w11023553/public_html/holiday/searchprocess.php on line 11 

Warning: SimpleXMLElement::xpath() [simplexmlelement.xpath]: Invalid expression in /var/www/vhosts/numyspace.co.uk/web_users/home/~unn_w11023553/public_html/holiday/searchprocess.php on line 22 

Warning: SimpleXMLElement::xpath() [simplexmlelement.xpath]: xmlXPathEval: evaluation failed in /var/www/vhosts/numyspace.co.uk/web_users/home/~unn_w11023553/public_html/holiday/searchprocess.php on line 22 

Warning: Invalid argument supplied for foreach() in /var/www/vhosts/numyspace.co.uk/web_users/home/~unn_w11023553/public_html/holiday/searchprocess.php on line 26 
Title

然后我尝试运行我的搜索文件

<?php 
include('functions.php'); 

$header = makeHeader(); 


// create an instance 
$holidayDoc =   simplexml_load_file('http://numyspace.co.uk/~unn_w11023553/holiday/holidays.xml');  

// set $studytype to either the upper case request or null 
$txtSearch = $_GET["txtSearch"]; 

// set the query using the studytype 
if (!is_null($txtSearch)) { 
    $qry = "//channel/item[description[contains(text(),\"$txtSearch\")]]"; 
} 
else { 
// blank search entered so all holidays are shown. 
    $qry = "/channel/'ALL'"; 
} 

$holidays = $holidayDoc->xpath($qry); // do the xpath query LINE 17 
// now loop through all the students 
echo "<table border=\"1\">\n"; 
echo "<tr><td>Title</td></tr>\n"; 
foreach ($holidays as $holiday) //LINE 21 
{ 
echo 
echo <p><strong><a href = '$link'>'$holiday'</a></strong></p> 
    <p><small>$published</small></p>"; 

} 


$footer = makeFooter();

？>

被摆弄它约2小时，仍然无法解决我出错的地方，任何见解都将不胜感激，谢谢。

来源

2012-04-13 user1302775

更换

$txtSearch = $_GET["txtSearch"];

与

if(isset($_GET["txtSearch"]) && (trim($_GET["txtSearch"]) != '')) { 
    $txtSearch = $_GET["txtSearch"]; 
} else { 
    $txtSearch = null; 
}

希望这有助于。

来源

2012-04-13 13:31:09

第一个警告告诉您txtSearch不是$_GET查询字符串参数数组中的值。例如。您正在调用脚本的网址中没有?txtSearch=something。

所以你需要检查你是如何调用脚本。查询字符串参数是否设置？拼写是否正确呢？

通过执行var_dump($_GET)，您可以调查一下$_GET的内容。

来源

2012-04-13 12:32:46

的XPath搜索PHP

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