QuickHashIntStringHash::loadFromString »

QuickHashIntStringHash::loadFromFile

(PECL quickhash >= Unknown)

QuickHashIntStringHash::loadFromFile — This factory method creates a hash from a file

Description

public static function QuickHashIntStringHash::loadFromFile(string $filename, int $size = 0, int $options = 0): QuickHashIntStringHash

This factory method creates a new hash from a definition file on disk. The file format consists of a signature 'QH0円x120円', the number of elements as a 32 bit signed integer in system Endianness, an unsigned 32 bit integer containing the number of element data to follow in characters. This element data contains all the strings. After the header and the strings, the elements follow in pairs of two unsigned 32 bit integers where the first one is the key, and the second one the index in the element data string. An example could be:

Example #1 QuickHash IntString file format

00000000 51 48 12 00 02 00 00 00 09 00 00 00 4f 4e 45 00 |QH..........ONE.|
00000010 4e 49 4e 45 00 01 00 00 00 00 00 00 00 03 00 00 |NINE............|
00000020 00 04 00 00 00 |.....|
00000025

Example #2 QuickHash IntString file format

header signature ('QH'; key type: 1; value type: 2; filler: 0円x00)
00000000 51 48 12 00
number of elements:
00000004 02 00 00 00
length of string values (9 characters):
00000008 09 00 00 00
string values:
0000000C 4f 4e 45 00 4e 49 4e 45 00
data string:
00000015 01 00 00 00 00 00 00 00 03 00 00 00 04 00 00 00
key/value 1 (key = 1, string index = 0 ("ONE")):
01 00 00 00 00 00 00 00
key/value 2 (key = 3, string index = 4 ("NINE")):
03 00 00 00 04 00 00 00

Parameters

filename: The filename of the file to read the hash 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 hash, rounded up to the nearest power of two with a maximum limit of 4194304.

Return Values

Returns a new QuickHashIntStringHash .

Examples

Example #3 QuickHashIntStringHash::loadFromFile() example

<?php
$file = dirname( __FILE__ ) . "/simple.string.hash";
$hash = QuickHashIntStringHash::loadFromFile(
 $file,
 QuickHashIntStringHash::DO_NOT_USE_ZEND_ALLOC
);
foreach( range( 0, 0x0f ) as $key )
{
 printf( "Key %3d (%2x) is %s\n",
 $key, $key,
 $hash->exists( $key ) ? 'set' : 'unset'
 );
}
?>

The above example will output something similar to:

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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