How to solve the Chinese garbled code in php ajax?

Solution: 1. All data use utf-8 encoding uniformly, including database encoding, php encoding and front-end encoding; 2. Use json_encode(), urlencode() to encode each character separately, and then use The urldecode() function performs decoding and returns the value.

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In php, after extracting data from the database, generally we will Extract multiple rows of data at one time. If the front-end js uses ajax to interact with the back-end, php can only echo one data, but we have multiple data, so only one array can be passed. This uses the json_encode() function. , the json_encode() function means to convert data into json data.

Let’s take a look at how to convert,

php array:

First we create two arrays in php, one contains Chinese, the other contains numbers or English, and finally outputs take a look. Idea: The associated values ​​are more intuitive

$gg=array('a'=>'中国','b'=>'日本','c'=>'美国','d'=>'加拿大','e'=>'法国');
$yy=array('f'=>'6','g'=>'7','h'>='8','i'=>'tom','j'=>'kevin');

Only output one of the arrays:

echo $json=json_encode($gg);

The output result is as follows

{"a":"\u4e2d\u56fd","b":"\u65e5\u672c","c":"\u7f8e\u56fd","d":"\u52a0\u62ff\u5927","e":"\u6cd5\u56fd"}

There are curly brackets on both sides and garbled characters

Put two arrays into one array and output them at the same time

echo $json=json_encode(array($gg,$yy));

The output results are as follows:

[{"a":"\u4e2d\u56fd","b":"\u65e5\u672c","c":"\u7f8e\u56fd","d":"\u52a0\u62ff\u5927","e":"\u6cd5\u56fd"},{"f":"6","g":"7","0":true,"i":"tom","j":"kevin"}]

We can see that after the arrays in the array are formatted in json, The data is enclosed in [] square brackets, and the arrays inside are enclosed in {} braces, but it is still garbled.

For the garbled code problem, there are two methods,

Method 1: All data are encoded in utf-8 uniformly, including encoding from the database. PHP coding and front-end coding.

Method 2: Use the following functions to encode each character separately: (Some symbols seem to be escaped unsuccessfully, so the use of this method is not recommended)

function JSON($array) { 
    arrayRecursive($array, 'urlencode', true); 
    $json = json_encode($array); 
    return urldecode($json); 
}

	function arrayRecursive(&$array, $function, $apply_to_keys_also = false){ 
    static $recursive_counter = 0; 
    if (++$recursive_counter > 1000) { 
        die('possible deep recursion attack'); 
    } 
    foreach ($array as $key => $value) { 
        if (is_array($value)) { 
            arrayRecursive($array[$key], $function, $apply_to_keys_also); 
        } else { 
            $array[$key] = $function($value); 
        }                                        
        if ($apply_to_keys_also && is_string($key)) { 
            $new_key = $function($key); 
            if ($new_key != $key) { 
                $array[$new_key] = $array[$key]; 
                unset($array[$key]); 
            } 
        } 
    } 
    $recursive_counter--; 
}

After using these two functions, the output result is:

[{"a":"中国","b":"日本","c":"美国","d":"加拿大","e":"法国"},{"f":"6","g":"7","0":"1","i":"tom","j":"kevin"}]

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