How to convert output encoding format in php

With the development and application of the Internet becoming more and more widespread, how to seamlessly convert between different programming languages ​​​​and web page encoding formats has become particularly important. PHP, as a widely used server-side scripting language, also needs to be supported. Conversion between different encoding formats, this article will focus on how to achieve conversion of output encoding formats in PHP.

1. Encoding format

Encoding format is the rule for encoding information. Common encoding formats include utf-8, gb2312, gbk, etc. Due to differences in character sets in different countries and regions, for the sake of compatibility and interoperability, UTF-8 has become the most commonly used encoding format. The UTF-8 encoding format can support character sets in multiple languages ​​and has a relatively rich number of characters. For example, the encoding format of many current web pages is UTF-8.

2. PHP output encoding format

In PHP, we usually use the echo statement to output content to the browser, but sometimes our PHP code and the web page encoding format are not consistent. At this time We need to convert the encoding format of the output content. We can use PHP's built-in functions iconv(), mb_convert_encoding() and UCL encoding to achieve encoding format conversion.

1. iconv() function

iconv() function is a character set conversion function for strings. It returns a string that converts a string from source_charset to dest_charset. String. The following is the syntax of this function:

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

Among them, the in_charset parameter represents the original character set, and the out_charset parameter represents the target character set. The str parameter represents the string that needs to be converted. For example, we insert the following code into the php web page:

header('Content-Type:text/html; charset=utf-8');
$str = "Hello, hello! ";
echo iconv("UTF-8", "GBK//IGNORE", $str);

This code snippet means to convert the $str string from utf-8 to gbk encoding Format. The output result is a string in GBK format: "Hello, hello!". In this way, we have achieved the conversion of the output encoding format.

2. mb_convert_encoding() function

The mb_convert_encoding() function is similar to the iconv() function and is also used for conversion between character sets. However, mb_convert_encoding() supports multiple character sets and can automatically detect unknown character sets to avoid some conversion errors. The following is the syntax of this function:

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

Among them, str represents the string that needs to be converted. to_encoding represents the target encoding, from_encoding represents the original encoding, and the mb_internal_encoding() function returns the internal encoding format of the current script. The above parameters are all optional parameters. For example, below we insert this php code snippet into the web page:

header('Content-Type:text/html; charset=utf-8');
$str = "Hello, hello !";
echo mb_convert_encoding($str, "GBK", "UTF-8");

This code snippet means to convert the $str string from utf-8 to gbk encoding format. The output is as follows: "Hello, hello!". Through the mb_convert_encoding() function, we can also easily convert the encoding format.

3. UCL encoding

UCL encoding is also a common encoding format. It is an alternative to utf-8 and can be used to handle the needs of browsers. characters displayed in . In php, we can use the ucl_encode() and ucl_decode() functions to convert the encoding format. The following is the syntax of this function:

string ucl_decode (string $var)

Among them, the var parameter represents the string that needs to be decoded. For example, the following php code snippet:

header('Content-Type: text/html; charset=ucl-1');
$str = ucl_encode("Hello, hello!");
echo ucl_decode($str);

This code means to use the ucl_encode() function to convert the encoding format of the $str string and then use the ucl_decode() function to decode it. Since we set the encoding of the header('Content-Type:text/html; charset=ucl-1') output format, our code can finally correctly output in the browser: "Hello, hello!" In this way, We have also completed the conversion of encoding formats.

3. Summary

As a widely used server-side scripting language, php can convert encoding formats in many scenarios, making it easier for us to read information from character sets in different encoding formats. Fetch and process, you can also try to output to different web pages. We can use functions such as iconv(), mb_convert_encoding() and UCL encoding to achieve encoding format conversion. No matter which function we use, we need to set the correct input and output character sets in the code to ensure that the output is correct, readable, and user-friendly.

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