- PHP 手册
- 函数参考
- 变量与类型相关扩展
- Quickhash
- QuickHashIntSet
QuickHashIntSet::__construct
(PECL quickhash >= Unknown)
QuickHashIntSet::__construct — Creates a new QuickHashIntSet object
说明
public QuickHashIntSet::__construct ( int$size
[, int $options
] )
This constructor creates a new QuickHashIntSet. The size is the amount of bucket lists to create. The more lists there are, the less collisions you will have. Options are also supported.
参数
-
size -
The amount of bucket lists to configure. The number you pass in will be automatically rounded up to the next power of two. It is also automatically limited from 4 to 4194304.
-
options -
The options that you can pass in are: QuickHashIntSet::CHECK_FOR_DUPES, which makes sure no duplicate entries are added to the set; QuickHashIntSet::DO_NOT_USE_ZEND_ALLOC to not use PHP's internal memory manager as well as one of QuickHashIntSet::HASHER_NO_HASH, QuickHashIntSet::HASHER_JENKINS1 or QuickHashIntSet::HASHER_JENKINS2. These last three configure which hashing algorithm to use. All options can be combined using bitmasks.
返回值
Returns a new QuickHashIntSet object.
范例
Example #1 QuickHashIntSet::__construct() example
<?php
var_dump( new QuickHashIntSet( 1024 ) );
var_dump( new QuickHashIntSet( 1024, QuickHashIntSet::CHECK_FOR_DUPES ) );
var_dump(
new QuickHashIntSet(
1024,
QuickHashIntSet::DO_NOT_USE_ZEND_ALLOC | QuickHashIntSet::HASHER_JENKINS2
)
);
?>
User Contributed Notes
There are no user contributed notes for this page.官方地址：https://www.php.net/manual/en/quickhashintset.construct.php