无需首先遍历数组就可以设置
PHP的内部数组指针.以下面的虚拟代码为例：
$array = range(1,100); // Represents the array key $pointer = 66; set_array_pointer($pointer,$array); $nextValue = next($array); // Should return 68
使用
ArrayIterator::seek提供的LibertyPaul解决方案似乎是使PHP设置指针到数组中的位置的唯一方法,而不会初始化用户界面中的循环.
尽管如此,您可以从ArrayIterator :: seek()的PHP source中读取,PHP将内部循环通过数组来设置指针：
尽管如此,您可以从ArrayIterator :: seek()的PHP source中读取,PHP将内部循环通过数组来设置指针：
/* {{{ proto void ArrayIterator::seek(int $position)
Seek to position. */
SPL_METHOD(Array,seek)
{
zend_long opos,position;
zval *object = getThis();
spl_array_object *intern = Z_SPLARRAY_P(object);
HashTable *aht = spl_array_get_hash_table(intern);
int result;
if (zend_parse_parameters(ZEND_NUM_ARGS(),"l",&position) == FAILURE) {
return;
}
if (!aht) {
PHP_error_docref(NULL,E_NOTICE,"Array was modified outside object and is no longer an array");
return;
}
opos = position;
if (position >= 0) { /* negative values are not supported */
spl_array_rewind(intern);
result = SUCCESS;
while (position-- > 0 && (result = spl_array_next(intern)) == SUCCESS);
if (result == SUCCESS && zend_hash_has_more_elements_ex(aht,spl_array_get_pos_ptr(aht,intern)) == SUCCESS) {
return; /* ok */
}
}
zend_throw_exception_ex(spl_ce_OutOfBoundsException,"Seek position %pd is out of range",opos);
} /* }}} */
所以看起来没有办法将数组指针设置到某个位置,而不会循环遍历数组
