# QuickHashIntSet::loadFromString

(PECL quickhash >= Unknown)

QuickHashIntSet::loadFromString — This factory method creates a set from a string

### 说明

public static QuickHashIntSet::loadFromString(string `$contents`, int `$size` = ?, int `$options` = ?): QuickHashIntSet

This factory method creates a new set from a definition in a string. 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

`contents`
  The string containing a serialized format of the set.
`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 automatically limited from `64` to `4194304`.

### 返回值

Returns a new QuickHashIntSet.

### 示例

示例 #1 QuickHashIntSet::loadFromString() example

`<?php
$contents = file_get_contents( dirname( __FILE__ ) . "/simple.set" );
$set = QuickHashIntSet::loadFromString(
$contents,
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'
);
}
?>`

以上示例的输出类似于：

    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

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