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问题描述
有没有在PHP的数组?
Is there a limit for an array in PHP?
推荐答案
是的,有在元素的最大数量限制。哈希表结构(数组基本上包装了一个哈希表)的定义是这样的(PHP 5.3):
Yes, there's a limit on the maximum number of elements. The hash table structure (arrays are basically wrappers around a hash table) is defined like this (PHP 5.3):
typedef struct _hashtable {
uint nTableSize;
uint nTableMask;
uint nNumOfElements;
ulong nNextFreeElement;
Bucket *pInternalPointer; /* Used for element traversal */
Bucket *pListHead;
Bucket *pListTail;
Bucket **arBuckets;
dtor_func_t pDestructor;
zend_bool persistent;
unsigned char nApplyCount;
zend_bool bApplyProtection;
#if ZEND_DEBUG
int inconsistent;
#endif
} HashTable;
因为
typedef unsigned int uint;
该限制是一个unsigned int(通常为2 ^ 32-1在32位操作系统和大多数64位操作系统)的最大尺寸。
the limit is the maximum size of an unsigned int (typically 2^32-1 on a 32-bit OS and on most 64-bit OS).
在实践中,然而,除了在有很多内存和32位整数的机器,你会一直打到内存限制之前,这将成为一个问题。
In practice, however, except on machines with lots of RAM and 32-bit ints, you will always hit the memory limit before this becomes an issue.
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