Notice: Undefined index: id in C:\xampp\htdocs\

Possible Duplicate: Reference - What does this error mean in PHP? I am trying to establish a database using PHP but I keep getting errors saying I have an undefined index in id. I want to add data into my database, also able to update, delete and show the infomation. This is my update info codes. <?PHP // Connection to MySQL $dbconnection = @mysql_connect('localhost','root',''); if (!$

注意:未定义的索引:在C:\ xampp \ htdocs \

可能重复: 参考 - 这个错误在PHP中意味着什么? 我试图建立一个数据库使用PHP,但我不断收到错误,说我有一个未定义的索引在ID。 我想将数据添加到我的数据库中,也能够更新,删除和显示信息。 这是我的更新信息代码。 <?PHP // Connection to MySQL $dbconnection = @mysql_connect('localhost','root',''); if (!$dbconnection) { echo '<p> Unable to connect to the database at this time.</br><

String could not be parsed as XML

This question already has an answer here: Reference - What does this error mean in PHP? 30 answers The XML appears to be invalid in lines 4 and 5: <notableFor>Fruit</title> <wikiid>Apple</title> Which should be: <notableFor>Fruit</notableFor> <wikiid>Apple</wikiid> I recommend using the XML validator at http://www.w3schools.com/xml/xml_vali

字符串不能解析为XML

这个问题在这里已经有了答案: 参考 - 这个错误在PHP中意味着什么? 30个答案 XML在第4行和第5行中似乎无效: <notableFor>Fruit</title> <wikiid>Apple</title> 应该是: <notableFor>Fruit</notableFor> <wikiid>Apple</wikiid> 我建议在http://www.w3schools.com/xml/xml_validator.asp使用XML验证器来调试XML代码中的错误。 此外,由于您的根元素是项目,您可能

Warning: Cannot modify header information

This question already has an answer here: How to fix “Headers already sent” error in PHP 11 answers Reference - What does this error mean in PHP? 30 answers The error message is triggering because of the HTML that appears before your first <?php tag. You cannot output anything before header() is called. To fix this error start your document with the <?php tag and only start outputt

警告:不能修改标题信息

这个问题在这里已经有了答案: 如何解决PHP 11中的“Headers already sent”错误 参考 - 这个错误在PHP中意味着什么? 30个答案 由于在第一个<?php标记之前出现的HTML,因此会触发错误消息。 在调用header()之前,不能输出任何内容。 要解决此错误,请使用<?php标记启动文档,并且在处理完输出XML for flash的条件后才开始输出HTML。 更清晰的解决方案是将Flash的XML生成和HTML输出分离到不同的文件中。 错误消

Fatal error: Call to a member function ...on string

This question already has an answer here: Reference - What does this error mean in PHP? 30 answers You're doing : $idea = mysql_real_escape_string($_POST['idea']); So $idea is a string now. Then you do : $check = $idea->checkIdea($title); There is no checkIdea method on strings.

致命错误:调用成员函数...在字符串上

这个问题在这里已经有了答案: 参考 - 这个错误在PHP中意味着什么? 30个答案 你在做 : $idea = mysql_real_escape_string($_POST['idea']); 所以$ idea现在是一个字符串。 然后你做: $check = $idea->checkIdea($title); 字符串没有checkIdea方法。

PHP: Fatal error: Call to a member function on a non

This question already has an answer here: Reference - What does this error mean in PHP? 30 answers The answer was due to hidden characters located in the lessons.db file. The error shown had nothing to do with this and I would like to thank everyone who took the time to give their two pence. I have two things for you: When you say: "I know it's a lot of code but I can't wo

PHP:致命错误:调用非成员函数

这个问题在这里已经有了答案: 参考 - 这个错误在PHP中意味着什么? 30个答案 答案是由于位于lessons.db文件中的隐藏字符。 所显示的错误与此无关,我想感谢每个花时间给他们两便士的人。 我有两件事给你: 当你说:“我知道这是很多代码,但我不知道为什么会突然发生这种情况,实际上在一次刷新中没有任何代码改变,即使我回溯到早期版本也是这样的发生“。 我想问你是否通过浏览器编程你的PHP代码? 如果是这样,有

Echoing session variables in php

This question already has an answer here: Reference - What does this error mean in PHP? 30 answers Inside a double-quoted string you must enclose a complex variable (array or object property) in {} : <p><?php echo("{$_SESSION['test']}"."<br />");?></p> This isn't an issue with $_SESSION specifically, but any array accessed by quoted keys. Note, that you can inc

在php中回显会话变量

这个问题在这里已经有了答案: 参考 - 这个错误在PHP中意味着什么? 30个答案 在双引号字符串中,您必须在{}包含复杂变量(数组或对象属性): <p><?php echo("{$_SESSION['test']}"."<br />");?></p> 这对于$_SESSION来说并不是特别的问题,而是任何通过引用键访问的数组。 请注意,您可以在{}包含数字索引的数组值,如"echo $array[2] is two";

Cannot modify header information

This question already has an answer here: How to fix “Headers already sent” error in PHP 11 answers Reference - What does this error mean in PHP? 30 answers I have much easier solution for you - it is simple! Just add this command at the very start of the php source: ob_start(); This will start buffering the output, so that nothing is really output until the PHP script ends (or until yo

无法修改标题信息

这个问题在这里已经有了答案: 如何解决PHP 11中的“Headers already sent”错误 参考 - 这个错误在PHP中意味着什么? 30个答案 我有更简单的解决方案 - 这很简单! 只需在php源代码的最开始处添加此命令即可: ob_start(); 这将开始缓冲输出,这样在PHP脚本结束之前(或者直到您手动刷新缓冲区)才会真正输出任何内容),并且直到那个时候才会发送标题! 所以你不需要重新组织你的代码 ,只需在你的代码的一开始就添加

PHP How to fix Notice: Undefined variable:

This question already has an answer here: Reference - What does this error mean in PHP? 30 answers Define the variables at the beginning of the function so if there are no records, the variables exist and you won't get the error. Check for null values in the returned array. $hn = null; $pid = null; $datereg = null; $prefix = null; $fname = null; $lname = null; $age = null; $sex =null;

PHP如何修复注意:未定义的变量:

这个问题在这里已经有了答案: 参考 - 这个错误在PHP中意味着什么? 30个答案 在函数的开头定义变量,所以如果没有记录,变量就存在,你不会得到错误。 检查返回数组中的空值。 $hn = null; $pid = null; $datereg = null; $prefix = null; $fname = null; $lname = null; $age = null; $sex =null; 你应该在while循环之外初始化你的变量。 在while循环之外,他们目前没有范围。 你只是依靠php的好处来让价值在循环之

Call to a member function on a non

This question already has an answer here: Reference - What does this error mean in PHP? 30 answers It means that $objPage is not an instance of an object. Can we see the code you used to initialize the variable? As you expect a specific object type, you can also make use of PHPs type-hinting featureDocs to get the error when your logic is violated: function page_properties(PageAtrributes

调用非成员函数

这个问题在这里已经有了答案: 参考 - 这个错误在PHP中意味着什么? 30个答案 这意味着$objPage不是一个对象的实例。 我们可以看到你用来初始化变量的代码吗? 正如您期望的特定对象类型一样,您还可以使用PHP类型提示featureDocs在违反逻辑时获取错误: function page_properties(PageAtrributes $objPortal) { ... $objPage->set_page_title($myrow['title']); } 此函数仅接受PageAtrributes的第一个

Override association mapping of a trait property in Doctrine 2.6

Prerequisites: PHP 7.1.8 Symfony 3.3.9 Doctrine 2.6.x-dev I wonder if it's possible to override an inversedBy attribute of a property association mapping that's taken from a trait. An interface that I use as a concrete user entity placeholder: ReusableBundleModelEntrantInterface.php interface EntrantInterface { public function getEmail(); public function getFirstName

在Doctrine 2.6中覆盖特征属性的关联映射

先决条件: PHP 7.1.8 Symfony 3.3.9 Doctrine 2.6.x-dev 我想知道是否可以重写属性关联映射的inversedBy属性,该属性取自特征。 我用作具体用户实体占位符的接口: ReusableBundle ModelEntrantInterface.php interface EntrantInterface { public function getEmail(); public function getFirstName(); public function getLastName(); } 以下架构工作得很好(需要创建实现EntrantInterface Use