how to call a php extension method from another php extension method - php

Question

I write a php extension which contains a simple method, and it works well.
I want to call "mysql_connect" method in this method. I have tried to find some documents or some guides ,but failed.
My extension method code is here:
PHP_FUNCTION(wdd_mysql_connect)
{
char *name;
int name_len;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &name, &name_len) == FAILURE)
{
return;
}
php_printf("Hello %s!", name);
// how to call mysql_connect????????
RETURN_TRUE;
}

Answer 1

Basically, you call zend_call_function(). Example of two helper functions to do that:
/* {{{ zval*** get_params_ex(const char *fmt,size_t len, va_list argp) */
static zval*** get_params_ex(const char *fmt, size_t len TSRMLS_DC, va_list argp) {
zval*** params;
size_t i, j;
char *s=NULL;
long l=-1,r=-1;
double d=-1;
zval *z=NULL;
zend_bool b=0;
params = safe_emalloc(len, sizeof(zval**), 0);
if(NULL == params) {
return NULL;
}
for(i=0; i < len; i++) {
params[i] = emalloc(sizeof(zval*));
}
for(i=0; i < len; i++) {
switch(fmt[i]) {
case 's':
s = va_arg(argp, char*);
MAKE_STD_ZVAL(*params[i]);
ZVAL_STRING(*params[i], s, 1);
break;
case 'l':
l = va_arg(argp, long);
MAKE_STD_ZVAL(*params[i]);
ZVAL_LONG(*params[i], l);
break;
case 'd':
d = va_arg(argp, double);
MAKE_STD_ZVAL(*params[i]);
ZVAL_DOUBLE(*params[i], d);
break;
case 'b':
b = va_arg(argp, int);
MAKE_STD_ZVAL(*params[i]);
ZVAL_BOOL(*params[i], b);
break;
case 'r':
r = va_arg(argp, long);
MAKE_STD_ZVAL(*params[i]);
ZVAL_RESOURCE(*params[i], r);
break;
case 'z':
z = va_arg(argp, zval*);
if(NULL != z) {
*params[i] = z;
}
else {
ALLOC_INIT_ZVAL(*params[i]);
}
break;
default:
php_error_docref(NULL TSRMLS_CC, E_CORE_ERROR, "Unexpected character '%c' in format specifier \"%s\"", fmt[i], fmt);
for(j = 0; j < i; j++) {
zval_ptr_dtor(params[j]);
}
efree(params);
return NULL;
}
}
return params;
}
/* }}} */
/* {{{ META_API zval* obj_call_method_internal_ex(zval *obj, zend_class_entry *ce, zend_function *func, zend_class_entry* calling_scope, zend_bool native_null TSRMLS_DC, char* fmt, ...)
* call method func of the object obj of type ce from the specified scope and return the value returned by the calee.
* if native_null is true, and the method returns a IS_NULL zval, then free that zval and return a NULL pointer
* valid format specifiers are [sldbrz] for string, long, double, boolean, resource, zval */
META_API zval* obj_call_method_internal_ex(zval *obj, zend_class_entry *ce, zend_function *func, zend_class_entry* calling_scope,
zend_bool native_null TSRMLS_DC, char* fmt, ...) {
zval ***params;
int argc;
zval *retval_ptr;
zend_fcall_info fci;
zend_fcall_info_cache fcc;
if(NULL != fmt) {
va_list argv;
argc = strlen(fmt);
va_start(argv, fmt);
params = get_params_ex(fmt, argc TSRMLS_CC, argv);
va_end(argv);
}
else {
argc = 0;
params = NULL;
}
retval_ptr = NULL;
fci.size = sizeof(fci);
fci.function_table = EG(function_table);
fci.function_name = NULL;
fci.symbol_table = NULL;
fci.object_ptr = obj;
fci.retval_ptr_ptr = &retval_ptr;
fci.param_count = argc;
fci.params = params;
fci.no_separation = 1;
fcc.initialized = 1;
fcc.function_handler = func;
fcc.object_ptr = obj;
fcc.calling_scope = calling_scope;
fcc.called_scope = ce;
/*if we want the object, and the object is not an object yet, we init it*/
if(func == ce->constructor) {
if(IS_NULL == Z_TYPE_P(obj)) {
object_init_ex(obj, ce);
}
else {
php_error_docref(NULL TSRMLS_CC, E_CORE_ERROR, "Cannot create an object");
native_null = 1;
goto clean_params;
}
}
if(FAILURE == zend_call_function(&fci, &fcc TSRMLS_CC)) {
php_error_docref(NULL TSRMLS_CC, E_CORE_ERROR, "Cannot call %s::%s", ce->name, func->common.function_name);
if(NULL != retval_ptr) {
zval_ptr_dtor(&retval_ptr);
}
}
clean_params:
if(NULL != params) {
int i;
for(i=0; i < argc; i++) {
zval_ptr_dtor(params[i]);
efree(params[i]);
}
efree(params);
}
if(func == ce->constructor) {
zval_ptr_dtor(&retval_ptr);
retval_ptr = fci.object_ptr;
}
else {
if(native_null) {
if(NULL != retval_ptr && IS_NULL == Z_TYPE_P(retval_ptr)) {
zval_ptr_dtor(&retval_ptr);
retval_ptr = NULL;
}
else {
php_error_docref(NULL TSRMLS_CC, E_CORE_ERROR, "The call %s::%s() does not return NULL as expected", ce->name, func->common.function_name);
}
}
}
return retval_ptr;
}
/* }}} */