php convert array to utf8

During the development process using PHP, we often need to deal with the issue of Chinese character encoding. One of the more common problems is converting arrays to UTF-8 encoding. This problem is particularly common when domestic developers use the Chinese language for development. The reason is that the encoding method of Chinese characters is different from that of English, and different encoding methods need to be used for processing. Below we will explain how to convert an array to UTF-8 encoding.

1. Understanding character encoding

Before introducing how to convert an array to UTF-8 encoding, we need to first understand the relevant knowledge of character encoding. Character encoding refers to the process of mapping characters to binary data. In computers, all characters are stored in the form of binary numbers. Character encoding allows the computer to convert when correctly storing and processing characters in different languages. Common character encoding methods include ASCII, Unicode and UTF-8.

ASCII encoding refers to using 7-bit binary numbers to represent 128 characters. This encoding method is only suitable for the representation of English letters and some special symbols, and cannot represent the languages ​​​​of other countries and regions.

Unicode encoding refers to using two or four bytes of binary numbers to represent all characters in the world, including Chinese, Japanese, Korean and other languages. However, this encoding method is relatively large and the storage and transmission efficiency is relatively low. Low.

UTF-8 encoding refers to using one to four bytes of binary numbers to represent all characters. In this encoding method, each character has a unique binary number representation. This encoding method not only supports the ASCII character set, but also includes languages ​​from other countries and regions.

2. How to use PHP to convert an array to UTF-8 encoding

In PHP, we can use a variety of functions to convert an array to UTF-8 encoding. Below we will introduce two of the more commonly used methods.

1.array_map function

array_map() is a more practical function in PHP. Its function is to pass each element of one or more arrays as a parameter to a function. Perform processing and return the processed value. When converting an array to UTF-8 encoding, we can use the array_map() function for processing. The following is how to use the array_map() function:

$array = array('测试1', '测试2', '测试3');
function utf8($str){
    return mb_convert_encoding($str, 'utf-8', 'gb2312');
}
$newArray = array_map('utf8', $array);
print_r($newArray);

In the above code, we first define an array $array, and then define a callback function utf8(), which uses the mb_convert_encoding() function Convert the string from gb2312 encoding to utf-8 encoding. Then use the array_map() function to apply the callback function to each element in the $array array, and assign the result to the $newArray array. Finally, use the print_r() function to output the $newArray array. You can see that all elements in the output array have been successfully converted to UTF-8 encoding.

2.array_walk_recursive function

Another function commonly used to convert arrays to UTF-8 encoding is array_walk_recursive(). This function is a function used to traverse multi-dimensional arrays. It can be used to traverse all elements in the array and perform specified operations on each element.

$array = array(
    '测试1'=>array('子项1'=>'汉字'),
    '测试2'=>array('子项2'=>'汉字'),
    '测试3'=>array('子项3'=>'汉字')
);
function utf8(&$value){
    $value = mb_convert_encoding($value, 'utf-8', 'gb2312');
}
array_walk_recursive($array, 'utf8');
print_r($array);

In the above code, we first define a multi-dimensional array $array, then define a callback function utf8(), and use the mb_convert_encoding() function to convert the string from gb2312 encoding to utf-8 Encoding. Then use the array_walk_recursive() function to pass each element in the array as a parameter to the utf8() function for processing. Finally, use the print_r() function to output the $array array. You can see that all elements in the output array have been successfully converted to UTF-8 encoding.

3. Summary

In the PHP development process, we often need to deal with the encoding of Chinese characters. Converting an array to UTF-8 encoding is one of the common problems, which can be easily handled using functions provided by PHP such as array_map() and array_walk_recursive(). The methods introduced above can be applied to Chinese character encoding issues in various PHP development scenarios. I hope it will be helpful to the majority of PHP developers.

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