To access a resource, you need to use the fol-
lowing macro (see Table 15.6 for an explanation of its arguments):
ZEND_FETCH_RESOURCE(rsrc, rsrc_type, passed_id, default_id,
resource_type_name, resource_type);
Table 15.6 ZEND_FETCH_RESOURCE Macro Arguments
Parameter
Meaning
rsrc
Variable that is assigned the resource value. It has to be of the same
type as the resource.
rsrc_type
Type of rsrc that will be used to cast the resource internally to the
correct type.
passed_id
The resource value to look for (as a zval **).
default_id
If this value is not 1, this id is taken. It is used for implementing a
default for the resource.
resource_type_name
A short type name for your resource which is used in error
messages.
resource_type
The resource type id of the registered resource.
Using this macro, we can now implement file_eof():
PHP_FUNCTION(file_eof)
{
int argc = ZEND_NUM_ARGS();
zval *filehandle = NULL;
FILE *fp;
if (zend_parse_parameters(argc TSRMLS_CC, “r”, &filehandle)
==FAILURE) {
return;
}
ZEND_FETCH_RESOURCE(fp, FILE *, &filehandle, -1, “standard-c
file”,le_myfile);
if (fp == NULL) {
RETURN_FALSE;
}
if (feof(fp) <= 0) {
/* Return eof also if there was an error */
RETURN_TRUE;
}
RETURN_FALSE;
}