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./bulid
./configure --disable-all --with-config-file-path=/etc/php.ini -with-config-file-scan-dir=/etc/php.d
make j4
make install

cd ext
./ext_skel --extname=sum					

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<?php
$total = sum([1,2,2,3,5,6]);

var_dump($total);

?>					

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/*
  +----------------------------------------------------------------------+
  | PHP Version 7                                                        |
  +----------------------------------------------------------------------+
  | Copyright (c) 1997-2017 The PHP Group                                |
  +----------------------------------------------------------------------+
  | This source file is subject to version 3.01 of the PHP license,      |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | http://www.php.net/license/3_01.txt                                  |
  | If you did not receive a copy of the PHP license and are unable to   |
  | obtain it through the world-wide-web, please send a note to          |
  | license@php.net so we can mail you a copy immediately.               |
  +----------------------------------------------------------------------+
  | Author:                                                              |
  +----------------------------------------------------------------------+
*/

/* $Id$ */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_sum.h"

/* proto integer sum(arry $arry) */
PHP_FUNCTION(sum)
{
  zval *input;
        zval *item;
        int32_t total;
        HashPosition position;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "a", &input) == FAILURE) {
    return;
  }

  for (zend_hash_internal_pointer_reset_ex(Z_ARRVAL_P(input), &position);
             (item = zend_hash_get_current_data_ex(Z_ARRVAL_P(input), &position));
            zend_hash_move_forward_ex(Z_ARRVAL_P(input), &position)) {
            if (Z_TYPE_P(item) == IS_LONG) {
               total += Z_LVAL_P(item);
            } else zend_throw_exception(NULL,"oh dear!",0);
        }
     
       RETURN_LOG(total);
}
/* }}} */


/* {{{ PHP_MINIT_FUNCTION
 */
PHP_MINIT_FUNCTION(sum)
{
  /* If you have INI entries, uncomment these lines
  REGISTER_INI_ENTRIES();
  */
  return SUCCESS;
}
/* }}} */

/* {{{ PHP_MSHUTDOWN_FUNCTION
 */
PHP_MSHUTDOWN_FUNCTION(sum)
{
  /* uncomment this line if you have INI entries
  UNREGISTER_INI_ENTRIES();
  */
  return SUCCESS;
}
/* }}} */

/* Remove if there's nothing to do at request start */
/* {{{ PHP_RINIT_FUNCTION
 */
PHP_RINIT_FUNCTION(sum)
{
#if defined(COMPILE_DL_SUM) && defined(ZTS)
  ZEND_TSRMLS_CACHE_UPDATE();
#endif
  return SUCCESS;
}
/* }}} */

/* Remove if there's nothing to do at request end */
/* {{{ PHP_RSHUTDOWN_FUNCTION
 */
PHP_RSHUTDOWN_FUNCTION(sum)
{
  return SUCCESS;
}
/* }}} */

/* {{{ PHP_MINFO_FUNCTION
 */
PHP_MINFO_FUNCTION(sum)
{
  php_info_print_table_start();
  php_info_print_table_header(2, "sum support", "enabled");
  php_info_print_table_end();

  /* Remove comments if you have entries in php.ini
  DISPLAY_INI_ENTRIES();
  */
}
/* }}} */

/* {{{ sum_functions[]
 *
 * Every user visible function must have an entry in sum_functions[].
 */
const zend_function_entry sum_functions[] = {
  PHP_FE(sum,  NULL)    /* For testing, remove later. */
  PHP_FE_END  /* Must be the last line in sum_functions[] */
};
/* }}} */

/* {{{ sum_module_entry
 */
zend_module_entry sum_module_entry = {
  STANDARD_MODULE_HEADER,
  "sum",
  sum_functions,
  PHP_MINIT(sum),
  PHP_MSHUTDOWN(sum),
  PHP_RINIT(sum),    /* Replace with NULL if there's nothing to do at request start */
  PHP_RSHUTDOWN(sum),  /* Replace with NULL if there's nothing to do at request end */
  PHP_MINFO(sum),
  PHP_SUM_VERSION,
  STANDARD_MODULE_PROPERTIES
};
/* }}} */

#ifdef COMPILE_DL_SUM
#ifdef ZTS
ZEND_TSRMLS_CACHE_DEFINE()
#endif
ZEND_GET_MODULE(sum)
#endif

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 * vim600: noet sw=4 ts=4 fdm=marker
 * vim<600: noet sw=4 ts=4
 */					

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dnl $Id$
dnl config.m4 for extension sum

dnl Comments in this file start with the string 'dnl'.
dnl Remove where necessary. This file will not work
dnl without editing.

PHP_ARG_ENABLE(sum, whether to enable sum support,
[  --enable-sum           Enable sum support])

if test "$PHP_SUM" != "no"; then
  PHP_NEW_EXTENSION(sum, sum.c, $ext_shared,, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1)
fi					

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phpize
./configure
make
make install					

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[PHP Modules]
Core
date
pcre
Reflection
SPL
standard
sum        <---- ist vorhanden

[Zend Modules]					

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[PHP Modules]
Core
date
pcre
Reflection
SPL
standard
                         <------ ist NICHT vorhanden
[Zend Modules]					

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<?php
$total = sum(1234);
var_dump($total);
?>					

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PHP_FUNCTION(sum)
{
        zval *input;
        zval *item;
        int32_t total;
        HashPosition position;

        if (zend_parse_parameters(ZEND_NUM_ARGS(), "l", &input) == FAILURE) {
                return;
        }

//      for (zend_hash_internal_pointer_reset_ex(Z_ARRVAL_P(input), &position);
  //           (item = zend_hash_get_current_data_ex(Z_ARRVAL_P(input), &position));
    //        zend_hash_move_forward_ex(Z_ARRVAL_P(input), &position)) {
      //      if (Z_TYPE_P(item) == IS_LONG) {
        //       total += Z_LVAL_P(item);
          //  } else zend_throw_exception(NULL,"oh dear!",0);
      //  }
       total = input + 2;
       RETURN_LONG(total);
}					

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<?php
$total = sum([1,2,3,4]);
var_dump($total);
?>					

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PHP_FUNCTION(sum)
{
        zval *input;
        zval *item;
        int32_t total;
        HashPosition position;

        if (zend_parse_parameters(ZEND_NUM_ARGS(), "a", &input) == FAILURE) {
                return;
        }

//      for (zend_hash_internal_pointer_reset_ex(Z_ARRVAL_P(input), &position);
  //           (item = zend_hash_get_current_data_ex(Z_ARRVAL_P(input), &position));
    //        zend_hash_move_forward_ex(Z_ARRVAL_P(input), &position)) {
      //      if (Z_TYPE_P(item) == IS_LONG) {
        //       total += Z_LVAL_P(item);
          //  } else zend_throw_exception(NULL,"oh dear!",0);
      //  }
       total = input;
       RETURN_LONG(total);
}					

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int32_t total = 0;
HashPosition position = 0;					

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schnippp
// Input_array wird in Zend entgegengenommen.
int Nur_eine_Zahl = Input_array[0];
return Nur_eine_Zahl;
schnippp