php内置函数分析之array_fill_keys()

 1 PHP_FUNCTION(array_fill_keys)
 2 {
 3     zval *keys, *val, *entry;
 4 
 5     if (zend_parse_parameters(ZEND_NUM_ARGS(), "az", &keys, &val) == FAILURE) {
 6         return;
 7     }
 8 
 9     /* Initialize return array */
10     array_init_size(return_value, zend_hash_num_elements(Z_ARRVAL_P(keys)));
11 
12     // 遍历数组keys
13     ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(keys), entry) {
14         ZVAL_DEREF(entry);
15         Z_TRY_ADDREF_P(val);
16         /* 以数组key值为键，val为值。插入返回的数组return_value */
17         if (Z_TYPE_P(entry) == IS_LONG) {
18             zend_hash_index_update(Z_ARRVAL_P(return_value), Z_LVAL_P(entry), val);
19         } else {
20             zend_string *key = zval_get_string(entry);
21             zend_symtable_update(Z_ARRVAL_P(return_value), key, val);
22             zend_string_release(key);
23         }
24     } ZEND_HASH_FOREACH_END();
25 }