Use C to expand PHP

Extend the PHP function with C: The integer in php is a signed number, and its internal implementation is actually long, not unsigned long. For 32-bit machines, the maximum integer that php can represent is 2 ^ 31-1, generally, the numbers larger than 2 ^ 31-1 and smaller than 2 ^ 32 can only be represented by strings. For mixed int_ext (string in), if the integer in the string is less than 2 ^ 31-1, an integer is returned. if it is greater than, a string is returned.

The steps for developing extension are as follows: (first download the php source code)

1. create an extension skeleton

cd php-5.3.14/ext  ./ext_skel --extname=int_ext

2. modify compilation parameters

cd php-5.3.14/ext/int_ext  vi config.m4

Remove PHP_ARG_ENABLE (int_ext, whether to enable int_ext support and
[-- Enable-int_ext Enable int_ext support]) The dnl before the two rows is changed:

dnl Otherwise use enable:    PHP_ARG_ENABLE(int_ext, whether to enable int_ext support,    dnl Make sure that the comment is aligned:    [  --enable-int_ext           Enable int_ext support])

3. write C code

cd php-5.3.14/ext/int_ext  vi php_int_ext.h

Add a line of PHP_FUNCTION (int_ext) after PHP_FUNCTION (confirm_int_ext_compiled );

cd php-5.3.14/ext/int_ext  vi int_ext.c

Add PHP_FE (int_ext, NULL) after PHP_FE (confirm_int_ext_compiled, NULL) and then:

zend_function_entry int_ext_functions[] = {    PHP_FE(confirm_int_ext_compiled, NULL) /* For testing, remove later. */    PHP_FE(int_ext, NULL)              /* For testing, remove later. */    {NULL, NULL, NULL}             /* Must be the last line in int_ext_functions[] */     };

Core code:

PHP_FUNCTION(int_ext)  {      char * str = NULL;      int str_len;      int argc = ZEND_NUM_ARGS();      if(zend_parse_parameters(argc TSRMLS_CC,"s",&str,&str_len) == FAILURE)          return ;      char * result;      int result_length = str_len;      result = (char *) emalloc(result_length + 1);      memcpy(result,str,result_length);      unsigned long result_num = strtoul(result, NULL, 10);      int sizeoflong  sizeof(long);      unsigned long max_long = 1 << (sizeoflong * 8 -1);      if(result_num < max_long)      {          RETURN_LONG(result_num);      }      else      {           RESULT_STRINGL(result, result_length, 0);       }  }

4. Compile

cd php-5.3.14/ext/int_ext  /usr/local/php/bin/pphpize  ./configure --with-php-config=/usr/local/php/bin/php-config  make   make install

A so file will be generated:/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/int_ext.so
Modify php. ini to add extended extension_dir = "/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613 /"

[int_ext]extension = int_ext.so

5. test

$ A = int_ext ("12345678900"); var_dump ($ a); $ a = int_ext ("123456789"); var_dump ($ a); result output: string (11) "12345678900" int (123456789)