隔行换色的老问题?
想实现在网页上显示隔行换色的功能,我用的是下面的第二种方法,理论上是可以的啊,结果全是一种颜色,后来查了查,还有第一种方法,挺好用的。只是想知道第二种方法那里出了问题,很困惑,以前都行的,查了好多资料,没有详解,求高手指点……
- PHP code
<!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --> //方法一 while($result=mysql_fetch_array($query)){ $bgcolor=($bgcolor=="blue") ? "white" : "blue"; echo "<tr bgcolor="{$bgcolor}">"; echo "<td><a href="detail.php?gid=%7B%24result%5B'gid'%5D%7D">{$result['gname']}</a></td>"; echo "<td>{$result['endtime']}</td>"; echo "<td>{$result['current_price']}</td>"; echo "<td>{$result['reply_num']}</td>"; echo "</tr>"; } //方法二 $flag=1; while($result=mysql_fetch_array($query)){ if($flag % 2 == 0) $bgcolor="yellow";else $bgbolor="white"; //这种方式理论上可以阿 echo "<tr bgcolor="{$bgcolor}">"; echo "<td><a href="detail.php?gid=%7B%24result%5B'gid'%5D%7D">{$result['gname']}</a></td>"; echo "<td>{$result['endtime']}</td>"; echo "<td>{$result['current_price']}</td>"; echo "<td>{$result['reply_num']}</td>"; echo "</tr>"; $flag++; }
------解决方案--------------------
为毛不用jquery在前端做??代码取余效率是个问题
------解决方案--------------------
if($flag % 2 == 0) $bgcolor="yellow";else $bgbolor="white";
$bgcolor !!!
自己写错了,怪谁呢?
------解决方案--------------------
楼主先输出$flag % 2
echo $flag % 2;echo '
';
看看是不是x0x0x0x0x0的格式。如果是的。在看是不是css样式问题
style="background:颜色"
------解决方案--------------------

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.

Fibers was introduced in PHP8.1, improving concurrent processing capabilities. 1) Fibers is a lightweight concurrency model similar to coroutines. 2) They allow developers to manually control the execution flow of tasks and are suitable for handling I/O-intensive tasks. 3) Using Fibers can write more efficient and responsive code.

The PHP community provides rich resources and support to help developers grow. 1) Resources include official documentation, tutorials, blogs and open source projects such as Laravel and Symfony. 2) Support can be obtained through StackOverflow, Reddit and Slack channels. 3) Development trends can be learned by following RFC. 4) Integration into the community can be achieved through active participation, contribution to code and learning sharing.

PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.

PHP is not dying, but constantly adapting and evolving. 1) PHP has undergone multiple version iterations since 1994 to adapt to new technology trends. 2) It is currently widely used in e-commerce, content management systems and other fields. 3) PHP8 introduces JIT compiler and other functions to improve performance and modernization. 4) Use OPcache and follow PSR-12 standards to optimize performance and code quality.

The future of PHP will be achieved by adapting to new technology trends and introducing innovative features: 1) Adapting to cloud computing, containerization and microservice architectures, supporting Docker and Kubernetes; 2) introducing JIT compilers and enumeration types to improve performance and data processing efficiency; 3) Continuously optimize performance and promote best practices.


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