The first PHP extension that is useful

: This article mainly introduces the first PHP extension that has a certain effect. if you are interested in the PHP Tutorial, please refer to it. C/C ++ to develop PHP extensions

I think for PHP developers, there are a lot of things to learn. of course, developing PHP extensions is also a skill that must be mastered. here, I would like to worship Laruence) ~
The first feature extension to be developed today is to generate the date section before the log when recording logs.

# Even if the current time, year-month-day hour: minute: Second timestamp. subtle number [20:39:32 1432039172.968199]

The php Extension function starts by generating the "skeleton":

1. go to the src/ext directory of php source code 2. run. /ext_skel -- extname = mytest3. enter src/ext/mytest/directory 4. when writing extensions, you must first modify the config. 10-12 lines of the me file. remove the dnl comment.

Declare the php extension function name in the header file php_mttest.h.

PHP_FUNCTION (get_log_title); # PHP_FUNCTION is a macro declared in the PHP kernel # define PHP_FUNCTION ZEND_FUNCTION // in the file src/main/php. h: row 347 # define ZEND_FUNCTION (name) ZEND_NAMED_FUNCTION (ZEND_FN (name) // File src/Zend/zend_API.h: 68 rows # define ZEND_FN (name) zif _ # name // File src/Zend/zend_API.h: 65 rows # define ZEND_NAMED_FUNCTION (name) void name (INTERNAL_FUNCTION_PARAMETERS) // File src/Zend/zend_API.h: row 67 # define INTERNAL_FUNCTION_PARAMETERS int ht, zval * return_value, zval ** return_value_ptr, zval * this_ptr, int return_value_used TSRMLS_DC // src/Zend/zend. h: 290 rows

After the above declaration function macro is expanded:

void zif_get_log_title( int ht, zval *return_value, zval **return_value_ptr, zval *this_ptr, int return_value_used TSRMLS_DC)

Add the get_log_title function declaration to the zend_function_entry declaration in mytest. c.

Const zend_function_entry logs_functions [] = {PHP_FE (confirm_logs_compiled, NULL)/* For testing, remove later. */PHP_FE (get_log_title, NULL) PHP_FE_END/* Must be the last line in logs_functions [] */}; # compile the function PHP_FUNCTION (get_log_title) {struct timeval TV; time_t rawtime; struct tm * timeinfo; char * formatinfo; time (& rawtime); timeinfo = localtime (& rawtime); gettimeofday (& TV, NULL); spprintf (& formatinfo, 0, "[% 4d-% 02d-% 02d % d: % d. % d] ", 1900 + timeinfo-> tm_year, 1 + timeinfo-> tm_mon, timeinfo-> tm_mday, timeinfo-> tm_hour, timeinfo-> tm_min, timeinfo-> tm_sec, TV. TV _sec, TV. TV _usec); RETURN_STRING (formatinfo, 1 );}

Here is a macro RETURN_STRING.

# Define RETURN_STRING (s, duplicate) {RETVAL_STRING (s, duplicate); return ;}// file src/Zend/zend_API.h: row 635 # define RETVAL_STRING (s, duplicate) ZVAL_STRING (return_value, s, duplicate) // File src/Zend/zend_API.h: row 623 # define ZVAL_STRING (z, s, duplicate) do {/// file src/Zend/zend_API.h: 577-583. the function is to assign a const char * _ s = (s) to a string type zval variable ); \ zval * _ z = (z); \ Z_STRLEN_P (_ z) = strlen (_ s); \\// set zval string length Z_ST RVAL_P (_ z) = (duplicate? Estrndup (_ s, Z_STRLEN_P (_ z) :( char *) _ s); \ // Set the zval string value Z_TYPE_P (_ z) = IS_STRING; \\// set the zval string type to string} while (0)

Therefore, the expanded RETURN_STRING (formatinfo, 1) is:

Do {const char * _ s = (formatinfo); zval * _ z = (return_value); // The return_value is estimated to be defined by the kernel, similar to zval * return_value; (* _ z ). value. str. len = strlrn (_ s); // equivalent to _ z-> value. str. len (* _ z ). value. str. val = (1? Estrndup (_ s, (* _ z). value. str. len) :( char *) _ s); (* _ z). type = 6 ;}

Compilation test

Php needs to be installed during compilation, for example, cd mytest is installed under the/usr/local/php/directory; // The function extension directory/usr/local/php/bin/phpize/run phpize to generate the configure file. /configure -- with-php-config =/usr/local/php/bin/php-config // configure, the following -- with-php-config will generate the so file to the installed extension directory. of course, you do not need to add it, if you manually copy the previous make // errors, correct make install // after running the command. the prompt is similar to the following # Installing shared extensions: /usr/local/php/lib/php/extensions/no-debug-non-zts-20100525/# Modify the configuration file php. add extension = mytest. so # test php-r 'Var _ dump (log_get_title ());'

If you output the following content, congratulations!

[Root @ iforever logs] # php-r 'Var _ dump (get_log_title (); '& datestring (39) "[May 19, 2015 22:52:29 1432047149.755613]" 22:52:29 CST

5/19/2015 10:54:38

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The above introduces the first PHP extension that has a certain effect, including some content, and hopes to be helpful to friends who are interested in PHP tutorials.