PHP关联数组的哈希函数

Question

我知道PHP关联数组存储在哈希表中。 哈希函数用于字符串'keys'？

Answer 1

从zend/hash.h：

/* 
* DJBX33A (Daniel J. Bernstein, Times 33 with Addition) 
* 
* This is Daniel J. Bernstein's popular `times 33' hash function as 
* posted by him years ago on comp.lang.c. It basically uses a function 
* like ``hash(i) = hash(i-1) * 33 + str[i]''. This is one of the best 
* known hash functions for strings. Because it is both computed very 
* fast and distributes very well. 
* 
[...] 
*     -- Ralf S. Engelschall 
*/ 

static inline ulong zend_inline_hash_func(const char *arKey, uint nKeyLength)