Table of Contents
回复讨论(解决方案)
Home Backend Development PHP Tutorial 怎么隐藏下拉框的值

怎么隐藏下拉框的值

Jun 23, 2016 pm 01:32 PM

假设 php网站中



如果在数据库中 有1 服务类 的记录 

那么下次提交表单的时候  隐藏  这条  

怎么实现?


回复讨论(解决方案)

<?php$exists = array(1,2); // 这个表示从数据库中读取到已经有的记录。放到这个数组中,读数据库你自己写就可以了。?><select id="hangye" name="hangye"><option value="0">请选择</option><?if(!in_array(1, $exists)){?><option value="1">服务类</option><?}?><?if(!in_array(2, $exists)){?><option value="2">制造类</option><?}?><?if(!in_array(3, $exists)){?><option value="3">广告类</option><?}?></select>
Copy after login
Copy after login

<?php$exists = array(1,2); // 这个表示从数据库中读取到已经有的记录。放到这个数组中,读数据库你自己写就可以了。?><select id="hangye" name="hangye"><option value="0">请选择</option><?if(!in_array(1, $exists)){?><option value="1">服务类</option><?}?><?if(!in_array(2, $exists)){?><option value="2">制造类</option><?}?><?if(!in_array(3, $exists)){?><option value="3">广告类</option><?}?></select>
Copy after login
Copy after login



你好聪明啊 我怎么都没想到 in_array() 函数

但是我怎么取值不出来?

假设我的数据表是 TABLE 其中有3条信息
id uid name
1 2 张三
2 8 李四
3 9 王二

$result = mysql_query("SELECT * FROM uid",TABLE);
$row = mysql_num_rows($result);
输出$row不对

$result = mysql_query("SELECT * FROM uid",TABLE);
from uid明显有问题


改为
$uid=xxx; // 要查询的uid
$result = mysql_query("SELECT * FROM TABLE where uid='".$uid."'") or die(mysql_error());
试试

$result = mysql_query("SELECT * FROM uid",TABLE);
from uid明显有问题


改为
$uid=xxx; // 要查询的uid
$result = mysql_query("SELECT * FROM TABLE where uid='".$uid."'") or die(mysql_error());
试试




我不是要查询一条信息 不是你楼上2楼说了吗 我想用这个办法取得 所有uid的数据 输出的结果是 2,8,9 这种类型的数组
再用in_array() 判断下拉框啊

那更简单

$query = mysql_query("select uid from TABLE") or die(mysql_error());$result = array();while($thread=mysql_fetch_assoc($query)){    $result[] = $thread['uid'];}
Copy after login
Copy after login
Copy after login
Copy after login
Copy after login

$result里面就是已经存在的uid了。

那更简单

$query = mysql_query("select uid from TABLE") or die(mysql_error());$result = array();while($thread=mysql_fetch_assoc($query)){    $result[] = $thread['uid'];}
Copy after login
Copy after login
Copy after login
Copy after login
Copy after login

$result里面就是已经存在的uid了。



输出为 Array
怎么解决

那更简单

$query = mysql_query("select uid from TABLE") or die(mysql_error());$result = array();while($thread=mysql_fetch_assoc($query)){    $result[] = $thread['uid'];}
Copy after login
Copy after login
Copy after login
Copy after login
Copy after login

$result里面就是已经存在的uid了。



有不用 while循环 或者 while外部输出的办法吗

把$result带进$exists答案不就出来了?

把$result带进$exists答案不就出来了?



不行的


那更简单

$query = mysql_query("select uid from TABLE") or die(mysql_error());$result = array();while($thread=mysql_fetch_assoc($query)){    $result[] = $thread['uid'];}
Copy after login
Copy after login
Copy after login
Copy after login
Copy after login

$result里面就是已经存在的uid了。



输出为 Array
怎么解决



数组输出当然是Array

这样你应该懂了吧。
$query = mysql_query("select uid from TABLE") or die(mysql_error());$result = array();while($thread=mysql_fetch_assoc($query)){    $result[] = $thread['uid'];} ?>
Copy after login
Copy after login



那更简单

$query = mysql_query("select uid from TABLE") or die(mysql_error());$result = array();while($thread=mysql_fetch_assoc($query)){    $result[] = $thread['uid'];}
Copy after login
Copy after login
Copy after login
Copy after login
Copy after login

$result里面就是已经存在的uid了。



输出为 Array
怎么解决



数组输出当然是Array

这样你应该懂了吧。
$query = mysql_query("select uid from TABLE") or die(mysql_error());$result = array();while($thread=mysql_fetch_assoc($query)){    $result[] = $thread['uid'];} ?>
Copy after login
Copy after login



懂了 好了 谢谢了 
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Java Tutorial
1663
14
PHP Tutorial
1264
29
C# Tutorial
1237
24
Explain different error types in PHP (Notice, Warning, Fatal Error, Parse Error). Explain different error types in PHP (Notice, Warning, Fatal Error, Parse Error). Apr 08, 2025 am 12:03 AM

There are four main error types in PHP: 1.Notice: the slightest, will not interrupt the program, such as accessing undefined variables; 2. Warning: serious than Notice, will not terminate the program, such as containing no files; 3. FatalError: the most serious, will terminate the program, such as calling no function; 4. ParseError: syntax error, will prevent the program from being executed, such as forgetting to add the end tag.

Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1? Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1? Apr 17, 2025 am 12:06 AM

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values ​​to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

PHP and Python: Comparing Two Popular Programming Languages PHP and Python: Comparing Two Popular Programming Languages Apr 14, 2025 am 12:13 AM

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP in Action: Real-World Examples and Applications PHP in Action: Real-World Examples and Applications Apr 14, 2025 am 12:19 AM

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

What are HTTP request methods (GET, POST, PUT, DELETE, etc.) and when should each be used? What are HTTP request methods (GET, POST, PUT, DELETE, etc.) and when should each be used? Apr 09, 2025 am 12:09 AM

HTTP request methods include GET, POST, PUT and DELETE, which are used to obtain, submit, update and delete resources respectively. 1. The GET method is used to obtain resources and is suitable for read operations. 2. The POST method is used to submit data and is often used to create new resources. 3. The PUT method is used to update resources and is suitable for complete updates. 4. The DELETE method is used to delete resources and is suitable for deletion operations.

PHP: A Key Language for Web Development PHP: A Key Language for Web Development Apr 13, 2025 am 12:08 AM

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

Explain the difference between self::, parent::, and static:: in PHP OOP. Explain the difference between self::, parent::, and static:: in PHP OOP. Apr 09, 2025 am 12:04 AM

In PHPOOP, self:: refers to the current class, parent:: refers to the parent class, static:: is used for late static binding. 1.self:: is used for static method and constant calls, but does not support late static binding. 2.parent:: is used for subclasses to call parent class methods, and private methods cannot be accessed. 3.static:: supports late static binding, suitable for inheritance and polymorphism, but may affect the readability of the code.

How does PHP handle file uploads securely? How does PHP handle file uploads securely? Apr 10, 2025 am 09:37 AM

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.

See all articles