How to convert all encodings in php to utf8

How to convert all encodings in php to utf8: 1. Use the mb_detect_encoding function to detect the original encoding of the string and then call the iconv function to convert the string from the original encoding to UTF-8 encoding; 2. Use the mb_detect_encoding function to detect characters The original encoding of the string, and then call the mb_convert_encoding function to convert the string from the original encoding to UTF-8 encoding; 3. Use regular expressions, etc.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

Encoding is the way computers process and store text. Different encodings represent the mapping rules of different character sets. UTF-8 is a universal character encoding that can represent almost all characters in the world. in PHP During development, you may encounter situations where you need to convert encoding to UTF-8. This article will introduce some practical methods to complete this task.

Method 1: Use the iconv function

The iconv function is a built-in function of PHP that is used to convert between different character encodings. Its syntax is as follows:

string iconv ( string $in_charset , string $out_charset , string $str )

This function accepts three parameters: source encoding in_charset, target encoding out_charset and the string str that needs to be converted. Use the iconv function to convert PHP The sample code for converting all encodings to UTF-8 is as follows:

$source_encoding = mb_detect_encoding($str);
$utf8_str = iconv($source_encoding, "UTF-8", $str);

First, detect the original encoding of the string by using the mb_detect_encoding function. Then, call the iconv function to convert the string from the original encoding to UTF-8 coding.

Method 2: Use the mb_convert_encoding function

The mb_convert_encoding function is another PHP built-in function for string encoding conversion. Its usage is as follows:

`string mb_convert_encoding ( string $str , string $to_encoding [, mixed 
$from_encoding = mb_internal_encoding() ])`

This function can have two or three parameters. The first two parameters are required. The first parameter is the string str to be encoded and converted, and the second parameter is the target encoding. to_encoding. The optional third parameter is the source encoding from_encoding, the default value is mb_internal_encoding().

The following is a sample code that uses the mb_convert_encoding function to convert all PHP encodings to UTF-8:

$source_encoding = mb_detect_encoding($str);
$utf8_str = mb_convert_encoding($str, "UTF-8", $source_encoding);

First use the mb_detect_encoding function to detect the original encoding of the string, and then call the mb_convert_encoding function to convert the string from The original encoding is converted to UTF-8 encoding.

Method 3: Use regular expressions

In addition to using the built-in iconv and mb_convert_encoding functions, you can also use regular expressions to convert all PHP encodings to UTF-8. This method can be achieved by replacing non-ASCII characters.

The following is a sample code to convert all encodings in PHP to UTF-8 using regular expressions:

function convert_to_utf8($str) {
return preg_replace_callback('/[\x{80}-\x{10FFFF}]/u', function ($match) 
{
return mb_convert_encoding($match[0], 'UTF-8', 'UCS-2BE');
}, $str);
}
$utf8_str = convert_to_utf8($str);

In the above example, the preg_replace_callback function and regular expressions are used to match non-ASCII characters , and then call The mb_convert_encoding function converts it to UTF-8 encoding.

Summary

In PHP development, converting encoding to UTF-8 is a basic operation. You can use the built-in iconv and mb_convert_encoding Functions can also be implemented using regular expressions. According to different scenarios and needs, choose the appropriate method to complete this task. No matter which method is used, make sure that the encoding of the data matches the converted encoding to avoid garbled characters or other problems. .

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