How to set the encoding format to utf8 in php

With the rapid development of web technology, developers are also looking for better ways to deal with garbled characters. Among them, php is a commonly used Web language, so how to set the utf8 encoding of php?

Before we start setting up utf8 encoding, we need to understand what utf8 encoding is. UTF8 (Universal Character Set Transformation Format) is an encoding method for all characters in the world, allowing one encoding scheme to represent characters in all languages.

php Widely used due to its flexibility and openness, most web applications are written in the php language. And utf8 encoding has become the best choice for handling multi-language development. Next, let’s look at how to set php’s utf8 encoding.

The first step is to check the php.ini file.

The php.ini file is the main file of the php configuration file. After opening the file, we need to confirm the following settings:

1. default_charset is set to "UTF-8".
2. mbstring.internal_encoding is set to "UTF-8".

As shown below:

[PHP]
...
default_charset = "UTF-8"
...
[ mbstring]
...
mbstring.internal_encoding = "UTF-8"
...

The second step is to set the http header information.

In php, we can use the header() function to set http header information. When setting the character set, we need to set Content-Type and charset.

For example: header("Content-Type:text/html; charset=UTF-8");

This can ensure that the browser correctly recognizes the character set.

The third step is to set up the database connection.

Before connecting to the database, we need to set the character set of the database to utf8. For example, you can use the MySQL command line client to connect and execute the following statement:

SET NAMES utf8;

This ensures that the database will use utf8 encoding in subsequent operations.

In addition, when using PDO to connect to the database, we also need to set the character set first, as shown below:

$dbh = new PDO(...);
$dbh ->exec("SET NAMES utf8");

The fourth step is character encoding conversion.

When processing data, we need to convert the character encoding. Character encoding can be converted to utf8 using the mb_convert_encoding() function.

For example, you can convert a gbk-encoded string to utf8:

$str = "garbled string";
$str = mb_convert_encoding($str, "UTF-8" , "GBK");

The fifth step is to use the htmlentities() function.

When outputting data, we need to filter out special characters to ensure that the characters are displayed correctly. Special characters can be converted to html entities using the htmlentities() function. For example, you can convert double quotes into entities:

$str = 'Hello "world"';
$str = htmlentities($str);

The above is to set the php utf8 encoding all steps. Through these steps, we can avoid garbled code problems, make web applications support multiple languages, and improve user experience.

Summary:

When writing web applications, character encoding is a very important issue because it is directly related to user experience. As a highly open language, php supports utf8 encoding. We only need to follow the above steps to set up the application to support multiple languages ​​and give users a better experience.

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