This factory method creates a hash from a file


(PECL quickhash >= Unknown)

QuickHashIntHash::loadFromFileThis factory method creates a hash from a file

Описание

public static QuickHashIntHash QuickHashIntHash::loadFromFile ( string $filename [, int $options ] )

This factory method creates a new hash from a definition file on disk. The file format consists of a signature 'QH\0x11\0', the number of elements as a 32 bit signed integer in system Endianness, followed by 32 bit signed integers packed together in the Endianness that the system that the code runs on uses. For each hash element there are two 32 bit signed integers stored. The first of each element is the key, and the second is the value belonging to the key. An example could be:

Пример #1 QuickHash IntHash file format

00000000  51 48 11 00 02 00 00 00  01 00 00 00 01 00 00 00  |QH..............| 00000010  03 00 00 00 09 00 00 00                           |........| 00000018

Пример #2 QuickHash IntHash file format

header signature ('QH'; key type: 1; value type: 1; filler: \0x00) 00000000  51 48 11 00  number of elements: 00000004  02 00 00 00  data string: 00000000  01 00 00 00 01 00 00 00  03 00 00 00 09 00 00 00  key/value 1 (key = 1, value = 1) 01 00 00 00  01 00 00 00  key/value 2 (key = 3, value = 9) 03 00 00 00  09 00 00 00

Список параметров

filename

The filename of the file to read the hash from.

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 hash, rounded up to the nearest power of two with a maximum limit of 4194304.

Возвращаемые значения

Returns a new QuickHashIntHash.

Примеры

Пример #3 QuickHashIntHash::loadFromFile() example

<?php
$file 
dirname__FILE__ ) . "/simple.hash";
$hash QuickHashIntHash::loadFromFile(
    
$file,
    
QuickHashIntHash::DO_NOT_USE_ZEND_ALLOC
);
foreach( 
range00x0f ) as $key )
{
    
printf"Key %3d (%2x) is %s\n",
        
$key$key
        
$hash->exists$key ) ? 'set' 'unset'
    
);
}
?>

Результатом выполнения данного примера будет что-то подобное:

 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