How to achieve Chinese interception without garbled characters in PHP

PHP is a popular server-side programming language that is widely used in the development of web applications. In web applications, we often need to intercept strings without destroying Chinese characters. However, the traditional PHP string interception method often causes problems such as garbled Chinese characters. This article will introduce how to achieve Chinese interception without garbled characters through PHP.

1. Problems with traditional interception methods

In PHP, there are many methods to intercept strings, common ones include substr(), mb_substr(), iconv_substr(), etc. However, when these methods intercept Chinese strings, problems often arise, such as garbled Chinese characters or inaccurate interception. Let's look at some examples below.

1. Use the substr() function to intercept Chinese strings

$str = "I love programming, programming makes me happy!";
$substr = substr($str, 0, 6);
echo $substr;
?>

The above code will output "I love programming" without garbled Chinese characters. question. However, if we try to intercept the Chinese character "programming", there will be problems using the substr() function:

$str = "I love programming, programming makes me happy!";
$substr = substr($str, 3, 6);
echo $substr;
?>

The above code will output "program, programming", Chinese characters "programming" "It was truncated. This result is obviously not what we want.

2. Use the mb_substr() function to intercept Chinese strings

The mb_substr() function is a built-in string interception function in PHP. It supports multi-byte characters and can avoid Chinese character garbled problem. Let's first take a look at the basic usage of the mb_substr() function:

$str = "I love programming, programming makes me happy!";
$substr = mb_substr($ str, 0, 6, 'utf-8');
echo $substr;
?>

The above code will output "I love programming", and there will be no problem of garbled Chinese characters. However, if we try to intercept Chinese characters "programming", using the mb_substr() function will also cause problems:

$str = "I love programming, programming makes me happy!";
$substr = mb_substr($str, 3, 6, 'utf-8');
echo $substr;
?>

The above code will output "Cheng", The Chinese character "programming" is truncated.

2. Solution

In response to the problems of traditional interception methods, we can use the following method to achieve Chinese interception without garbled characters:

1. Convert the Chinese string to UTF-8 encoding

In PHP, we can use the mb_convert_encoding() function to convert Chinese strings to UTF-8 encoding. UTF-8 is a variable-length Unicode character encoding that can represent almost all characters in the world, including Chinese characters. We can first convert the Chinese string to UTF-8 encoding, so that Chinese characters can be processed correctly when intercepting the string. Here is an example:

$str = "I love programming, programming makes me happy!";
$str = mb_convert_encoding($str, 'UTF-8', 'auto');
echo $str;
?>

The above code will convert the $str string to UTF-8 encoded output.

2. Use the mb_substr() function to intercept the string

After converting the Chinese string to UTF-8 encoding, we can use the mb_substr() function to intercept the string . The usage of the mb_substr() function is the same as described before, and you need to specify parameters such as string, starting position, length, and encoding method. Here is an example:

$str = "I love programming, programming makes me happy!";
$str = mb_convert_encoding($str, 'UTF-8', 'auto');
$substr = mb_substr($str, 3, 6, 'utf-8');
echo $substr;
?>

The above code will Output "programming", Chinese characters are correctly intercepted.

3. Summary

Interception of Chinese strings has always been a troublesome problem. The traditional PHP string interception method often results in garbled Chinese characters or inaccurate interception. By converting the Chinese string to UTF-8 encoding, we can use the mb_substr() function to intercept the string, thereby solving the problem of Chinese interception without garbled characters.

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