Discussion: How to Write PHP Extensions_PHP Tutorial

Advantages and disadvantages of extending PHP with C/C++:
Advantages:
Efficiency, or efficiency
Reduce the complexity of PHP scripts, in extreme cases , you only need to simply call an extended function in the PHP script, and then all your functions will be extended and implemented
The disadvantages are also obvious:
Complex development
Reduced maintainability
The development cycle becomes longer. The simplest example is when you use PHP scripts, if you find that a certain judgment condition is wrong, you only need to modify this line. Save it and it will take effect immediately. If it is a PHP extension written in C/C++, then you need to modify the source code, recompile, then reload into PHP, and then restart Apache to see the effect.
If you are familiar with C, writing a PHP extension is not very difficult. PHP itself provides a framework to simplify your development.
The easiest way to start the development of a PHP extension is to use the extension framework wizard ext_skel provided by PHP. It will generate the most basic code necessary for a PHP extension. To use it, you first need to download the PHP source code. , or development package, enter the ext directory of the PHP source code, and you will find this tool.
Generate an extension:
./ext_skel --extname=myext
Enter /myext and select the extension type:
vi config.m4
Select the following two types Just one will do:

Copy code The code is as follows:

//(depends on external library)
dnl PHP_ARG_WITH(myext , for myext support,
dnl Make sure that the comment is aligned:
dnl [ --with-myext Include myext support])
//Remove dnl
PHP_ARG_WITH(myext, for myext support,
Make sure that the comment is aligned:
[ --with-myext Include myext support])

//Or remove//(not relying on external libraries) dnl PHP_ARG_ENABLE(myext, whether to enable myext support,dnl Make sure that the comment is aligned:dnl [ --enable-myext Enable myext support])// dnl
Modify the header file php_myext.h:
//PHP_FUNCTION(confirm_myext_compiled); /* For testing, remove later. */
//Modify to
PHP_FUNCTION(myext); /* For testing , remove later. */
Modify myext.c:
//Place
//zend_function_entry myext_functions[] = {
// PHP_FE(confirm_myext_compiled, NULL) /* For testing, remove later. */
// {NULL, NULL, NULL} /* Must be the last line in myext_functions[] */
//};
//Modify to
zend_function_entry myext_functions[] = {
PHP_FE(myext, NULL) /* For testing, remove later. */
{NULL, NULL, NULL} /* Must be the last line in myext_functions[] */
};
//Add your own function at the bottom of the file
PHP_FUNCTION(myext)
{
zend_printf("Hello World!n");
}
Install your own php extension myext:
/usr/local/php/bin/phpize
./configure --with-php-config=/usr/local/php/bin/php-config
make
make install

Modify php.ini and add:
extension = "myext.so"
Restart the web server and check phpinfo to see your extension:

Create a new test php file:

myext();

Execute this file and you will see and become familiar with it But "Hello World!"

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