Backend Development
PHP Tutorial
Generate random numbers. Example code of two methods for generating random numbers in PHP. Output random IP.
Generate random numbers. Example code of two methods for generating random numbers in PHP. Output random IP.
Share three methods of generating random numbers in PHP. Generate non-repeating random numbers between 1-10. Examples of PHP generating non-repeating random numbers. Friends in need can refer to them.
How to generate non-repeating random numbers between 1-10 using php?
Example 1, use shuffle function to generate random numbers.
<?php
$arr=range(1,10);
shuffle($arr);
foreach($arr as $values)
{
echo $values." ";
}
?>Example 2, use array_unique function to generate random numbers.
<?php
$arr=array();
while(count($arr)<10)
{
$arr[]=rand(1,10);
$arr=array_unique($arr);
}
echo implode(" ",$arr);
?>Example 3, use array_flip function to generate random numbers, which can remove duplicate values.
<?php
$arr=array();
$count1=0;
$count = 0;
$return = array();
while ($count < 10)
{
$return[] = mt_rand(1, 10);
$return = array_flip(array_flip($return));
$count = count($return);
} //www.jb51.net
foreach($return as $value)
{
echo $value." ";
}
echo "<br/>";
$arr=array_values($return);// 获得数组的值
foreach($arr as $key)
echo $key." ";
?>I am an asp programmer. This is my first time writing a php program. I would like to share my experience
<?php
$ip2id= round(rand(600000, 2550000) / 10000); //第一种方法，直接生成
$ip3id= round(rand(600000, 2550000) / 10000);
$ip4id= round(rand(600000, 2550000) / 10000);
//下面是第二种方法，在以下数据中随机抽取
$arr_1 = array("218","218","66","66","218","218","60","60","202","204","66","66","66","59","61","60","222","221","66","59","60","60","66","218","218","62","63","64","66","66","122","211");
$randarr= mt_rand(0,count($arr_1)-1);
$ip1id = $arr_1[$randarr];
echo $ip1id;
echo ".";
echo $ip2id;
echo ".";
echo $ip3id;
echo ".";
echo $ip4id;
?>The output result of the example is 218.28.131.182
The characteristic of this program is that the first field of the generated IP is Within the specified range, the set ones are common domestic number ranges, which means that most of the generated IP addresses are domestic. Core code:
<?php
$arr_1 = array("http://66.249.89.99","http://66.249.89.104","http://74.125.71.105");
$randarr= mt_rand(0,count($arr_1)-1);
$gip= $arr_1[$randarr];
echo $gip."$randarr";
?>The above introduces the example code of two methods of generating random numbers in PHP. Outputting random IP includes the content of generating random numbers. I hope it will be helpful to friends who are interested in PHP tutorials.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Alipay PHP SDK transfer error: How to solve the problem of 'Cannot declare class SignData'?
Apr 01, 2025 am 07:21 AM
Alipay PHP...
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
How does session hijacking work and how can you mitigate it in PHP?
Apr 06, 2025 am 12:02 AM
Session hijacking can be achieved through the following steps: 1. Obtain the session ID, 2. Use the session ID, 3. Keep the session active. The methods to prevent session hijacking in PHP include: 1. Use the session_regenerate_id() function to regenerate the session ID, 2. Store session data through the database, 3. Ensure that all session data is transmitted through HTTPS.
Describe the SOLID principles and how they apply to PHP development.
Apr 03, 2025 am 12:04 AM
The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.
How to debug CLI mode in PHPStorm?
Apr 01, 2025 pm 02:57 PM
How to debug CLI mode in PHPStorm? When developing with PHPStorm, sometimes we need to debug PHP in command line interface (CLI) mode...
How to automatically set permissions of unixsocket after system restart?
Mar 31, 2025 pm 11:54 PM
How to automatically set the permissions of unixsocket after the system restarts. Every time the system restarts, we need to execute the following command to modify the permissions of unixsocket: sudo...
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
How to send a POST request containing JSON data using PHP's cURL library?
Apr 01, 2025 pm 03:12 PM
Sending JSON data using PHP's cURL library In PHP development, it is often necessary to interact with external APIs. One of the common ways is to use cURL library to send POST�...
