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keys13     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 }