php内置函数分析之array_fill_keys()

 PHP_FUNCTION(array_fill_keys)
 {
     zval *keys, *val, *entry;

     if (zend_parse_parameters(ZEND_NUM_ARGS(), "az", &keys, &val) == FAILURE) {
         return;
     }

     /* Initialize return array */
     array_init_size(return_value, zend_hash_num_elements(Z_ARRVAL_P(keys)));

     // 遍历数组keys
     ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(keys), entry) {
         ZVAL_DEREF(entry);
         Z_TRY_ADDREF_P(val);
         /* 以数组key值为键，val为值。插入返回的数组return_value */
         if (Z_TYPE_P(entry) == IS_LONG) {
             zend_hash_index_update(Z_ARRVAL_P(return_value), Z_LVAL_P(entry), val);
         } else {
             zend_string *key = zval_get_string(entry);
             zend_symtable_update(Z_ARRVAL_P(return_value), key, val);
             zend_string_release(key);
         }
     } ZEND_HASH_FOREACH_END();
 }