(急!!)PHP + MYSQL查询结果分页显示问题
include_once ("./config.php");
db_connect();
// 获取当前页数
if( isset($_POST['page']) )//判断是否有下面的表单post来的值
{
$page=$_POST['page'];
}
else if(isset($_GET['page']))//判断是否有get来的值
{
$page = intval( $_GET['page'] );
}
else
{
$page = 1;
}
// 每页数量
$page_size = 10;
$devicename=$_POST["textname"];
if($_POST[Submit]!="")
{
$sql = "select count(*) as amount from labdeviceinfo where DeviceName='$devicename'";
}
else
{
$sql = "select count(*) as amount from labdeviceinfo";
}
$result = mysql_query($sql);
$row = mysql_fetch_row($result);
$amount = $row[0];// 获取总数据量
// 记算总共有多少页
if( $amount )
{
if( $amount {
$page_count = 1;
}
if( $amount % $page_size ) //取总数据量除以每页数的余数
{
$page_count = (int)($amount / $page_size) + 1; //如果有余数,则页数等于总数据量除以每页数的结果取整再加一
}
else
{
$page_count = $amount / $page_size; //如果没有余数,则页数等于总数据量除以每页数的结果
}
}
else
{
$page_count = 0;
}
// 翻页链接
$page_string = '';
if( $page == 1)
{
$page_string .= '首页|上一页|';
}
else
{
$page_string .= '首页|上一页|';
}
if( ($page == $page_count) || ($page_count == 0) )
{
$page_string .= '下一页|末页';
}
else
{
$page_string .= '下一页|末页';
}
?>
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|

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.

In PHP, trait is suitable for situations where method reuse is required but not suitable for inheritance. 1) Trait allows multiplexing methods in classes to avoid multiple inheritance complexity. 2) When using trait, you need to pay attention to method conflicts, which can be resolved through the alternative and as keywords. 3) Overuse of trait should be avoided and its single responsibility should be maintained to optimize performance and improve code maintainability.

Dependency Injection Container (DIC) is a tool that manages and provides object dependencies for use in PHP projects. The main benefits of DIC include: 1. Decoupling, making components independent, and the code is easy to maintain and test; 2. Flexibility, easy to replace or modify dependencies; 3. Testability, convenient for injecting mock objects for unit testing.

SplFixedArray is a fixed-size array in PHP, suitable for scenarios where high performance and low memory usage are required. 1) It needs to specify the size when creating to avoid the overhead caused by dynamic adjustment. 2) Based on C language array, directly operates memory and fast access speed. 3) Suitable for large-scale data processing and memory-sensitive environments, but it needs to be used with caution because its size is fixed.

PHP handles file uploads through the $\_FILES variable. The methods to ensure security include: 1. Check upload errors, 2. Verify file type and size, 3. Prevent file overwriting, 4. Move files to a permanent storage location.

In JavaScript, you can use NullCoalescingOperator(??) and NullCoalescingAssignmentOperator(??=). 1.??Returns the first non-null or non-undefined operand. 2.??= Assign the variable to the value of the right operand, but only if the variable is null or undefined. These operators simplify code logic, improve readability and performance.


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