php内置函数分析array_count_values()

 PHP_FUNCTION(array_count_values)
 {
     zval    *input,        /* Input array */
             *entry,        /* An entry in the input array */
             *tmp;
     HashTable *myht;

     if (zend_parse_parameters(ZEND_NUM_ARGS(), "a", &input) == FAILURE) {
         return;
     }

     /* Initialize return array */
     array_init(return_value);

     /* Go through input array and add values to the return array */
     myht = Z_ARRVAL_P(input);
     // 循环遍历数组
     ZEND_HASH_FOREACH_VAL(myht, entry) {
         ZVAL_DEREF(entry);
         /* 数组元素的值只能是字符串或整数 */
         if (Z_TYPE_P(entry) == IS_LONG) { // 数组元素值为整数
             if ((tmp = zend_hash_index_find(Z_ARRVAL_P(return_value), Z_LVAL_P(entry))) == NULL) { // 返回数组中不存在该键
                 zval data;
                 ZVAL_LONG(&data, ); // 首次出现，+1
                 zend_hash_index_update(Z_ARRVAL_P(return_value), Z_LVAL_P(entry), &data); // 添加到返回值数组
             } else {
                 Z_LVAL_P(tmp)++; // 元素值出现次数+1
             }
         } else if (Z_TYPE_P(entry) == IS_STRING) { // 数组元素值为字符串
             if ((tmp = zend_symtable_find(Z_ARRVAL_P(return_value), Z_STR_P(entry))) == NULL) {
                 zval data;
                 ZVAL_LONG(&data, );
                 zend_symtable_update(Z_ARRVAL_P(return_value), Z_STR_P(entry), &data);
             } else {
                 Z_LVAL_P(tmp)++;
             }
         } else {
             // 数组元素的值非字符串或整数，则报warning错误。
             php_error_docref(NULL, E_WARNING, "Can only count STRING and INTEGER values!");
         }
     } ZEND_HASH_FOREACH_END();
 }