PHP 函数如何自定义扩展？

#include <php.h>

PHP_FUNCTION(greet) {
  char *name;
  size_t name_len;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "s", &name, &name_len) == FAILURE) {
    return;
  }

  printf("Hello, %s!", name);
}

ZEND_DECLARE_MODULE_GLOBALS(greet)

PHP_MINIT_FUNCTION(greet) {
  zend_declare_global(greet_globals, sizeof(greet_globals), NULL, ZEND_MODULE_GLOBALS);
  return SUCCESS;
}

PHP_MSHUTDOWN_FUNCTION(greet) {
  return SUCCESS;
}

PHP_RINIT_FUNCTION(greet) {
  return SUCCESS;
}

PHP_RSHUTDOWN_FUNCTION(greet) {
  return SUCCESS;
}

PHP_MINFO_FUNCTION(greet) {
  php_info_print_table_start();
  php_info_print_table_header(2, "greet support", "enabled");
  php_info_print_table_end();
}

PHP_MODULE_ENTRY(greet, greet, greet_module_entry, NU(0)) {
  // 注册扩展中声明的 PHP 函数和常量
}

phpize
./configure
make

cp src/greet.so /usr/lib/php/20180731/
edit /etc/php/7.3/cli/conf.d/99-custom.ini

<?php
dl('greet.so');
greet('Alice');