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This factory method creates a hash from a file


QuickHashIntStringHash::loadFromFile

(PECL quickhash >= Unknown)

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

Description

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

This factory method creates a new hash from a definition file on disk. The file format consists of a signature 'QH\0x12\0', 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 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: \0x00) 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( 
range00x0f ) 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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