cd /owndata/software/php-5.4.13/ext

./ext_skel --extname=myext

dnl PHP_ARG_WITH(myext, for myext support,
dnl Make sure that the comment is aligned:
dnl [ --with-myext       Include myext support])

PHP_ARG_WITH(myext, for myext support,
 
[ --with-myext       Include myext support])

PHP_FUNCTION(myext_helloworld);

const zend_function_entry myext_functions[] = {
    PHP_FE(confirm_myext_compiled, NULL)      /* For testing, remove later. */
    PHP_FE(myext_helloworld, NULL)
    PHP_FE_END   /* Must be the last line in myext_functions[] */
};

PHP_FUNCTION(myext_helloworld)
{
    char *arg = NULL;
  int arg_len, len;
  char *strg;
  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &arg, &arg_len) == FAILURE) {
    return;
  }
  php_printf("my first ext,Hello World!\n");
  RETRUN_TRUE;
}

./configure --with-php-config=/usr/local/webserver/php/bin/php-config
 
make && make install

cp myext.so /usr/local/webserver/php/ext/

extension=/usr/local/webserver/php/ext/myext.so

service php restart

/usr/local/webserver/php/bin/php -m|grep myext

 /usr/local/webserver/php/bin/php -r "myext_helloworld('test');"

<?php
echo myext_helloworld('test');
?>