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When dealing with multibyte strings, the mbstring extension provides strong support for PHP. Among them, mb_get_info() is a very practical function to get the internal setting state of mbstring . However, many developers will encounter some confusion during use, such as the return result is difficult to interpret, or the return is empty, etc. This article will take you to systematically understand how to debug mb_get_info() and provide detailed solutions to common problems.
mb_get_info() is a function in the PHP mbstring extension to obtain the current multibyte string environment setting information. It has three uses:
// Get all settings information
$info = mb_get_info();
// Get the specified item
$encoding = mb_get_info("internal_encoding");
// Get the current encoding settings
$current_encoding = mb_get_info("encoding");
The returned data is usually an associative array, and the content may be as follows:
Array
(
[internal_encoding] => UTF-8
[http_input] => pass
[http_output] => pass
[input_encoding] => UTF-8
[output_encoding] => UTF-8
[language] => neutral
[encoding_translation] => Off
)
Run the following command to check if PHP is loaded with mbstring :
if (function_exists('mb_get_info')) {
echo "mbstring Enabled";
} else {
echo "mbstring Not enabled";
}
If return mbstring is not enabled , you need to enable the extension in php.ini :
extension=mbstring
Then restart the PHP service.
Sometimes you may need to check the changes before and after setting up encoding:
echo "Initial information:\n";
print_r(mb_get_info());
mb_internal_encoding("ISO-8859-1");
mb_http_output("UTF-8");
echo "Modified information:\n";
print_r(mb_get_info());
This comparison process helps position whether your settings are actually in effect.
In practical applications, we can record the return value in the log for subsequent analysis:
file_put_contents("/var/log/mbstring_debug.log", print_r(mb_get_info(), true));
Possible reasons:
mbstring extension not enabled
The --enable-mbstring parameter was not added when compiling PHP
Solution:
Check php.ini or run phpinfo() to see if the mbstring module is included
Recompile PHP using the following command (for source code installation):
./configure --enable-mbstring
make && make install
encoding_translation indicates whether input/output encoding conversion is enabled. The default is off state, and if you use mb_output_handler() it may be automatically enabled.
The opening method is as follows:
output_handler = mb_output_handler
Or enable in the code:
ob_start("mb_output_handler");
If you find that the value returned by mb_get_info() has not changed after setting the encoding, it may be that the scope of the setting is incorrect.
mb_internal_encoding("UTF-8"); // correct：Set internal encoding
ini_set("default_charset", "UTF-8"); // Affects only the output
The two functions are different and they need to be distinguished when used.
In actual projects, such as a website that handles multilingual characters, we can add the following code to the initialization configuration file:
mb_internal_encoding("UTF-8");
mb_http_input("UTF-8");
mb_http_output("UTF-8");
mb_language("uni");
if (isset($_GET['debug_mb'])) {
echo "<pre>";
print_r(mb_get_info());
echo "</pre>";
}
In this way, when you access https://gitbox.net/index.php?debug_mb=1 , you can quickly obtain the current mbstring configuration information for easy debugging.
mb_get_info() is an indispensable tool for understanding and debugging the PHP multibyte string environment. Through the explanation of this article, I believe you can already master the use method and quickly locate and solve common problems. It will be your most reliable assistant in dealing with sensitive scenarios such as internationalization and character encoding conversion.
For more information on PHP coding skills, you can visit our official documentation or join the developer community: https://gitbox.net/docs/mbstring .
