Sharing of practical tips for PHP coding and transcoding

Sharing practical tips on PHP encoding and transcoding

When developing PHP applications, you often encounter situations where encoding conversion is required. Different encoding formats will cause text to appear garbled or abnormal, so it is very important to master encoding and transcoding skills. This article will share some common practical techniques for PHP encoding and transcoding, and attach specific code examples.

1. UTF-8 and GBK encoding conversion

UTF-8 and GBK are two common encoding formats, which are often encountered in web development and database operations . If you need to convert a UTF-8 encoded string to GBK encoding, you can use the iconv function. The sample code is as follows:

$utf8_str = "Hello, world";
$gbk_str = iconv("UTF-8", "GBK", $utf8_str);
echo $gbk_str;

If you need to convert the GBK-encoded string to UTF-8 encoding, you can just swap the positions of the parameters in the iconv function. The code example is as follows:

$gbk_str = "Hello, world";
$utf8_str = iconv("GBK", "UTF-8", $gbk_str);
echo $utf8_str;

2. URL encoding and decoding

When processing URL parameters, it is often necessary to URL encode or decode the parameters in order to pass special characters or Chinese characters . PHP provides urlencode and urldecode functions for URL encoding and decoding. The sample code is as follows:

$str = "Hello, world!";
$encoded_str = urlencode($str);
echo $encoded_str;

$decoded_str = urldecode($encoded_str);
echo $decoded_str;

3. HTML entity encoding and decoding

When outputting HTML content, in order to avoid XSS attacks or display special characters, the HTML content is usually entity-encoded . You can use the htmlspecialchars and htmlspecialchars_decode functions in PHP to encode and decode HTML entities. The sample code is as follows:

$html_str = "<h1>Sharing practical tips for PHP encoding and transcoding</h1>";
$encoded_str = htmlspecialchars($html_str);
echo $encoded_str;

$decoded_str = htmlspecialchars_decode($encoded_str);
echo $decoded_str;

4. JSON encoding and decoding

In PHP, it is often necessary to convert data into JSON format for transmission or storage. JSON encoding and decoding can be done using the json_encode and json_decode functions. The sample code is as follows:

$data = array("name" => "John", "age" => 30, "city" => "New York");
$json_str = json_encode($data);
echo $json_str;

$decoded_data = json_decode($json_str, true); // The second parameter is true to convert to an associative array
print_r($decoded_data);

By mastering the above practical PHP encoding and transcoding skills, you can better handle the conversion problem between different encoding formats and ensure the stability and compatibility of the application. Hope the above content is helpful to you.

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