This article provides a detailed analysis of PHP extensions written in C language. For more information, see
1: Pre-defined
In the home directory, you can also write a file in any other Directory, such as caleng_module.def.
The content is the name and parameters of the function you want to define:
Int a (int x, int y)
String B (string str, int n)
2: go to the ext Directory of the php source code directory
# Cd/usr/local/php-5.4.0/ext/
Run the command to generate the corresponding extension directory
#./Ext_skel -- extname = caleng_module -- proto =/home/hm/caleng_module.def
3: modify config. m4
Remove dnl comments
PHP_ARG_ENABLE (caleng_module, whether to enable caleng_module support,
Make sure that the comment is aligned:
[-Enable-caleng_module Enable caleng_module support])
4: modify caleng_module.c
The code is as follows:
/* {Proto int a (int x, int y)
*/
PHP_FUNCTION ()
{
Int argc = ZEND_NUM_ARGS ();
Int x;
Int y;
Int z;
If (zend_parse_parameters (argc TSRMLS_CC, "ll", & x, & y) = FAILURE)
Return;
Z = x + y;
RETURN_LONG (z );
}
/*}}}*/
/* {Proto string B (string str, int n)
*/
PHP_FUNCTION (B)
{
Char * str = NULL;
Int argc = ZEND_NUM_ARGS ();
Int str_len;
Long n;
Char * result;
Char * ptr;
Int result_length;
If (zend_parse_parameters (argc TSRMLS_CC, "sl", & str, & str_len, & n) = FAILURE)
Return;
Result_length = str_len * n;
Result = (char *) emalloc (result_length + 1 );
Ptr = result;
While (n --){
Memcpy (ptr, str, str_len );
Ptr + = str_len;
}
* Ptr = '\ 0 ';
RETURN_STRINGL (result, result_length, 0 );
}
/*}}}*/
5. generate an Extension Library
# Cd./caleng_module
#/Usr/local/php/bin/phpize
#./Configure -- with-php-config =/usr/local/php/bin/php-config
# Make
# Make install
6: corresponding extensions directory to php
As shown in
# Cd/usr/local/php/lib/php/extend/no-debug-non-zts-20100525/
The generated caleng_module.so file is in the directory.
7: modify php. ini
If the php. ini file cannot be found, you can view the phpinfo () file.
# Cd/usr/local/php/lib/
Added extension information for php. ini.
Extension = caleng_module.so
8: restart Apache
#/Usr/local/apache2/bin/apachectl restart
9: check loading
/Usr/local/php/bin/php-m
10: PHP call
The code is as follows:
Echo a (1, 2 );
Output 3 indicates the operation is successful!
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Below is the original text
Develop PHP extensions using C in Linux
First download the PHP source package, assuming the source package directory is:/software/php-5.2.13
First download the PHP source package, assuming the source package directory is:/software/php-5.2.13
#> Cd/software/php-5.2.13/ext
2. Suppose we want to develop an extension named caleng_module, which contains two functions: a -- processing two integers and B-processing string repeated output;
1. First, write a function definition file. in this file, the prototype suffix of the function is def, which is assumed to be caleng_module.def.
Int a (int x, int y)
String B (string str, int n)
2. the extension directory caleng_module will be automatically created under the ext Directory through the extension skeleton generator.
#>./Ext_skel -- extname = caleng_module -- proto = caleng_module.def
3. modify the configuration file: #> vim/software/php-5.2.13/ext/caleng_module/config. m4, remove the comment label "dnl" in the following line, after the modification is as follows:
PHP_ARG_ENABLE (myfunctions, whether to enable myfunctions support,
Make sure that the comment is aligned:
[-- Enable-myfunctions Enable myfunctions support])
4. improve functions of functions a and B: #> vim/software/php-5.2.13/ext/caleng_module/caleng_module.c
PHP_FUNCTION ()
{
Int x, y, z;
Int argc = ZEND_NUM_ARGS ();
If (zend_parse_parameters (argc TSRMLS_CC, "ll", & x, & y) = FAILURE)
Return;
Z = x + y;
RETURN_LONG (z );
}
PHP_FUNCTION (B)
{
Char * str = NULL;
Int argc = ZEND_NUM_ARGS ();
Int str_len;
Long n;
Char * result;
Char * ptr;
Int result_length;
If (zend_parse_parameters (argc TSRMLS_CC, "sl", & str, & str_len, & n) = FAILURE)
Return;
Result_length = str_len * n;
Result = (char *) emalloc (result_length + 1 );
Ptr = result;
While (n --){
Memcpy (ptr, str, str_len );
Ptr + = str_len;
}
* Ptr = '\ 0 ';
RETURN_STRINGL (result, result_length, 0 );
}
3. Compile and install php. assume that the installation directory of php is/usr/localhost/webserver/php.
#> Cd/software/php-5.2.13/ext/caleng_module
#>/Usr/localhost/webserver/php/bin/phpize
#>./Configure -- with-php-config =/usr/localhost/webserver/php/bin/php-config
#> Make
#> Make install
Now the caleng_module.so file is generated in the/usr/local/webserver/php/lib/php/extensions/no-debug-non-zts-20060613 Directory
Add extension = caleng_module.so to the php. ini configuration file.
Work done
