- PHP 手册
- 函数参考
- 变量与类型相关扩展
- Quickhash
- QuickHashIntSet
QuickHashIntSet::loadFromFile
(PECL quickhash >= Unknown)
QuickHashIntSet::loadFromFile — This factory method creates a set from a file
说明
public static QuickHashIntSet::loadFromFile ( string$filename
[, int $size
[, int $options
]] ) : QuickHashIntSet
This factory method creates a new set from a definition file on disk. The file format consists of 32 bit signed integers packed together in the Endianness that the system that the code runs on uses.
参数
-
filename -
The filename of the file to read the set from.
-
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 same options that the class' constructor takes; except that the size option is ignored. It is automatically calculated to be the same as the number of entries in the set, rounded up to the nearest power of two with a maximum limit of 4194304.
返回值
Returns a new QuickHashIntSet.
范例
Example #1 QuickHashIntSet::loadFromFile() example
<?php
$file = dirname( __FILE__ ) . "/simple.set";
$set = QuickHashIntSet::loadFromFile(
$file,
QuickHashIntSet::DO_NOT_USE_ZEND_ALLOC
);
foreach( range( 0, 0x0f ) as $key )
{
printf( "Key %3d (%2x) is %s\n",
$key, $key,
$set->exists( $key ) ? 'set' : 'unset'
);
}
?>
以上例程的输出类似于：
Key 0 ( 0) is unset Key 1 ( 1) is set Key 2 ( 2) is set Key 3 ( 3) is set Key 4 ( 4) is unset Key 5 ( 5) is set Key 6 ( 6) is unset Key 7 ( 7) is set Key 8 ( 8) is unset Key 9 ( 9) is unset Key 10 ( a) is unset Key 11 ( b) is set Key 12 ( c) is unset Key 13 ( d) is set Key 14 ( e) is unset Key 15 ( f) is unset
User Contributed Notes
There are no user contributed notes for this page.官方地址：https://www.php.net/manual/en/quickhashintset.loadfromfile.php