search
HomeBackend DevelopmentPHP ProblemHow to obtain web page source code and convert encoding in php

In the world of the Internet, crawlers and data acquisition are very common needs. However, many times what we get is not the result we expect, and one of the reasons is encoding problems. How to correctly obtain the source code of a web page and perform encoding conversion?

There are many ways to obtain the source code of a web page in PHP, such as file_get_contents(), curl, etc. We choose file_get_contents() as an example here.

First of all, we need to determine the encoding format of the website. If we do not specify the encoding, PHP sets the character encoding to ISO-8859-1 by default. Therefore, by default, we need to convert the obtained web page source code from ISO-8859-1 to the encoding format we need. . The following is a simple example:

$url = "https://www.example.com";
$html = file_get_contents($url);
$html = mb_convert_encoding($html, "UTF-8", "ISO-8859-1");
echo $html;

Among them, $url is the website URL that needs to be obtained, and $html is the obtained web page source code. To convert $html to encoding format, the function used is mb_convert_encoding(). Among its parameters, the first is the string that needs to be converted, the second is the target encoding format that needs to be converted, and the third is the original encoding. Format. Here we convert it to UTF-8 encoding.

In actual development, we may encounter more complex encoding formats, such as GBK, BIG5, etc. In this case, we need to handle it according to the actual situation. The encoding format can be determined by searching for charset in HTML, for example:

<meta charset="gbk">

The encoding format is uncertain In this case, we can use the mb_detect_encoding() function in the PHP library for automatic identification. For example:

$url = "https://www.example.com";
$html = file_get_contents($url);
$charset = mb_detect_encoding($html, "UTF-8, GBK, BIG5, ISO-8859-1");
$html = mb_convert_encoding($html, "UTF-8", $charset);
echo $html;

Among them, $charset represents the automatically recognized encoding format, and converts it into UTF-8 format to output the result.

Of course, in actual development, we still need to consider many details, such as network connection timeout, HTTP status code judgment, special characters in text, etc. However, this article has provided you with a basic idea and method, and briefly demonstrated several Chinese encoding conversion methods. It is analyzed and supplemented here. I believe readers can operate according to their actual needs.

The above is the detailed content of How to obtain web page source code and convert encoding in php. For more information, please follow other related articles on the PHP Chinese website!

Statement
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
ACID vs BASE Database: Differences and when to use each.ACID vs BASE Database: Differences and when to use each.Mar 26, 2025 pm 04:19 PM

The article compares ACID and BASE database models, detailing their characteristics and appropriate use cases. ACID prioritizes data integrity and consistency, suitable for financial and e-commerce applications, while BASE focuses on availability and

PHP Secure File Uploads: Preventing file-related vulnerabilities.PHP Secure File Uploads: Preventing file-related vulnerabilities.Mar 26, 2025 pm 04:18 PM

The article discusses securing PHP file uploads to prevent vulnerabilities like code injection. It focuses on file type validation, secure storage, and error handling to enhance application security.

PHP Input Validation: Best practices.PHP Input Validation: Best practices.Mar 26, 2025 pm 04:17 PM

Article discusses best practices for PHP input validation to enhance security, focusing on techniques like using built-in functions, whitelist approach, and server-side validation.

PHP API Rate Limiting: Implementation strategies.PHP API Rate Limiting: Implementation strategies.Mar 26, 2025 pm 04:16 PM

The article discusses strategies for implementing API rate limiting in PHP, including algorithms like Token Bucket and Leaky Bucket, and using libraries like symfony/rate-limiter. It also covers monitoring, dynamically adjusting rate limits, and hand

PHP Password Hashing: password_hash and password_verify.PHP Password Hashing: password_hash and password_verify.Mar 26, 2025 pm 04:15 PM

The article discusses the benefits of using password_hash and password_verify in PHP for securing passwords. The main argument is that these functions enhance password protection through automatic salt generation, strong hashing algorithms, and secur

OWASP Top 10 PHP: Describe and mitigate common vulnerabilities.OWASP Top 10 PHP: Describe and mitigate common vulnerabilities.Mar 26, 2025 pm 04:13 PM

The article discusses OWASP Top 10 vulnerabilities in PHP and mitigation strategies. Key issues include injection, broken authentication, and XSS, with recommended tools for monitoring and securing PHP applications.

PHP XSS Prevention: How to protect against XSS.PHP XSS Prevention: How to protect against XSS.Mar 26, 2025 pm 04:12 PM

The article discusses strategies to prevent XSS attacks in PHP, focusing on input sanitization, output encoding, and using security-enhancing libraries and frameworks.

PHP Interface vs Abstract Class: When to use each.PHP Interface vs Abstract Class: When to use each.Mar 26, 2025 pm 04:11 PM

The article discusses the use of interfaces and abstract classes in PHP, focusing on when to use each. Interfaces define a contract without implementation, suitable for unrelated classes and multiple inheritance. Abstract classes provide common funct

See all articles

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

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools