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2/zend_ht.md

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@@ -61,6 +61,8 @@ unset($arr["c"]);
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![](../img/zend_hash_1.png)
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> 图中Bucket的zval.u2.next默认值应该为-1,不是0
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### 2.2.2 映射函数
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映射函数(即:散列函数)是散列表的关键部分,它将key与value建立映射关系,一般映射函数可以根据key的哈希值与Bucket数组大小取模得到,即`key->h % ht->nTableSize`,但是PHP却不是这么做的:
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```c

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