QUOTE:
原帖由 sadly 于 2007-6-14 10:15 PM 发表
看 php源码的 ext/session/session.c
php_add_session_var 函数
<?php
PHPAPI void php_add_session_var(char *name, size_t namelen TSRMLS_DC)
{
zval **sym_track = NULL;
IF_SESSION_VARS() {
zend_hash_find(Z_ARRVAL_P(PS(http_session_vars)), name, namelen + 1,
(void *) &sym_track);
} else {
return;
}
/*
* Set up a proper reference between $_SESSION["x"] and $x.
*/
if (PG(register_globals)) {
zval **sym_global = NULL;
if (zend_hash_find(&EG(symbol_table), name, namelen + 1, (void *) &sym_global) == SUCCESS) {
if ((Z_TYPE_PP(sym_global) == IS_ARRAY && Z_ARRVAL_PP(sym_global) == &EG(symbol_table)) || *sym_global == PS(http_session_vars)) {
return;
}
}
if (sym_global == NULL && sym_track == NULL) {
zval *empty_var;
ALLOC_INIT_ZVAL(empty_var); /* this sets refcount to 1 */
empty_var->refcount = 0; /* our module does not maintain a ref */
/* The next call will increase refcount by NR_OF_SYM_TABLES==2 */
zend_set_hash_symbol(empty_var, name, namelen, 1, 2, Z_ARRVAL_P(PS(http_session_vars)), &EG(symbol_table));
} else if (sym_global == NULL) {
SEPARATE_ZVAL_IF_NOT_REF(sym_track);
zend_set_hash_symbol(*sym_track, name, namelen, 1, 1, &EG(symbol_table));
} else if (sym_track == NULL) {
SEPARATE_ZVAL_IF_NOT_REF(sym_global);
zend_set_hash_symbol(*sym_global, name, namelen, 1, 1, Z_ARRVAL_P(PS(http_session_vars)));
}
} else {
if (sym_track == NULL) {
zval *empty_var;
ALLOC_INIT_ZVAL(empty_var);
ZEND_SET_SYMBOL_WITH_LENGTH(Z_ARRVAL_P(PS(http_session_vars)), name, namelen+1, empty_var, 1, 0);
}
}
}
?>
