


Several common methods for PHP string encoding conversion_PHP tutorial
php tutorial several common methods of string encoding conversion
mb_convert_encoding()
PHP internal code conversion function
Version (PHP 4 >= 4.0.6, PHP 5)
This function can convert various encodings to each other
Make a GBK To UTF-8
header("content-Type: text/html; charset=Utf-8");
echo mb_convert_encoding("You are my friend", "UTF-8", "GBK");
?>
Another GB2312 To Big5
header("content-Type: text/html; charset=big5");
echo mb_convert_encoding("You are my friend", "big5", "GB2312");
?>
iconv()
PHP internal code conversion function, same as above
Because iconv() has a bug when converting gb2312, it needs to be handled like this
PHP codeiconv( "UTF-8", "gb2312//IGNORE" , $str)
ignore means to ignore errors during conversion. It is found that iconv will make an error when converting the character "—" to gb2312. If there is no
ignore parameter, all strings following this character cannot be saved.
In addition, mb_convert_encoding does not have this bug, so the best way to write it is:
PHP codemb_convert_encoding($str,"gb2312", "UTF-8");
But you need to enable the mbstring extension library first.
You can also set the collation of the mysql tutorial database tutorial to utf-8 and it will not be used for conversion
Three mysql mantras
SQL code
SET NAMES utf8;
SET CHARACTER SET utf8;
SET COLLATION_CONNECTION='utf8_general_ci';
Custom function 1
-------------------------------------------------- ----------------------------------
---
I found the conversion function on the Internet to convert GB2312. After modifying it to utf-8, the conversion error occurred and the Chinese could not be parsed... Looking forward to it
The madman...
PHP code
function escape($str) {
Preg_match_all("/[x80-xff].|[x01-x7f]+/",$str,$r);
$ar = $r[0];
foreach($ar as $k=>$v) {
If(ord($v[0])
$ar[$k] = rawurlencode($v);
else
$ar[$k] = "%u".bin2hex(iconv("GB2312","UCS-2",$v));
return join("",$ar);
}
$str = rawurldecode($str);
Preg_match_all("/(?:%u.{4})|.+/",$str,$r);
$ar = $r[0];
foreach($ar as $k=>$v) {
If(substr($v,0,2) == "%u" && strlen($v) == 6)
$ar[$k] = iconv("UCS-2","GB2312",pack("H4",substr($v,-4)));
}
return join("",$ar);
}
?>
Custom function 2
-------------------------------------------------- ----------------------------------
Thanks to forum gingzai777, experts are different, they can see the problem at a glance....
In the future, you can use this line for PHP filtering, and you don’t need to worry about file encoding.....
PHP code
function addslashes_str($str){
$str=addslashes($str);
$str=str_replace($str,";",';');
return $str;
}
function strips tutorial lashes_str($str){
$str=stripslashes($str);
$str=str_replace($str,';',";");
return $str;
}
?>

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7


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