PHP output array Chinese cannot be displayed

Outputting arrays in PHP is a very common operation, but sometimes there is a problem that Chinese characters cannot be displayed normally. This is because the default character set used by PHP is ISO-8859-1, and Chinese characters are in ISO-8859- 1 is not supported. This article will introduce how to solve the problem that the Chinese output array of PHP cannot be displayed normally.

1. Understand character encoding

Before explaining how to solve the problem that PHP output array Chinese cannot be displayed normally, let us first understand the relevant knowledge of character encoding.

1. ASCII code

ASCII code is an encoding method that uses 7-bit or 8-bit binary encoding to represent characters. ASCII code contains characters such as numbers, letters, punctuation marks, control symbols, etc., totaling 128 characters. ASCII code is the earliest encoding method used by computers.

2. Unicode Encoding

Unicode encoding is a character encoding scheme that contains most of the world's character sets, including Chinese characters. Unicode encoding adopts 2-byte or 4-byte encoding, among which Chinese characters use 3-byte encoding.

3. UTF-8 encoding

UTF-8 encoding is a variable-length Unicode encoding method that uses 1-4 bytes to represent a character, where ASCII The code is represented by 1 byte, and Chinese characters are represented by 3 bytes. UTF-8 encoding is widely used in web development.

2. Solve the problem that the Chinese output array of PHP cannot be displayed normally

After understanding the relevant knowledge of character encoding, let’s solve the problem that the Chinese output array of PHP cannot be displayed normally. The solution is as follows:

1. Modify the PHP file encoding

Modify the PHP file encoding to UTF-8 encoding, which can be achieved by adding the following code at the beginning of the PHP file:

header('Content-Type:text/html;charset=utf-8');

In this way, the PHP file will be output using UTF-8 encoding and Chinese characters can be displayed normally.

2. Modify the encoding method of Chinese characters in the array

If modifying the encoding of the PHP file cannot solve the problem, you can try modifying the encoding method of the Chinese characters in the array. To change the encoding method of Chinese characters from ISO-8859-1 to UTF-8, you can use the following code to achieve it:

$new_array = array();
foreach($old_array as $key=>$value){
    if(is_string($value)){
        $new_array[$key] = mb_convert_encoding($value, "UTF-8", "ISO-8859-1");
    } else{
        $new_array[$key] = $value;
    }
}

In the above code, use foreach to loop through the array to determine whether the array element is of string type. If so, change the encoding method of the element from ISO-8859-1 to UTF-8, and store the modified element in the new array. If not, store the original element in the new array. Finally, output the new array.

3. Set UTF-8 encoding in HTML page

If the first two methods cannot solve the problem, you can try to set UTF-8 encoding in HTML page. Set UTF-8 encoding by adding the following code to the header of the HTML page:

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

This way, Chinese characters can be displayed normally in the HTML page.

Summary

Outputting arrays in PHP is a very common operation, but sometimes there is a problem that Chinese cannot be displayed properly. This is because the default character set used by PHP is ISO-8859-1, and Chinese characters are not supported in ISO-8859-1. In order to solve this problem, we can modify the PHP file encoding, modify the encoding of Chinese characters in the array, or set UTF-8 encoding in the HTML page. Through the above method, you can solve the problem that the Chinese output array of PHP cannot be displayed normally.

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