This factory method creates a hash from a file

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- This factory method creates a hash from a file

# QuickHashIntHash::loadFromFile

(PECL quickhash >= Unknown)

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

### Description

public static QuickHashIntHash::loadFromFile(string `$filename`, int `$options` = ?): QuickHashIntHash

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:

Example #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

Example #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

### Parameters

`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`.

### Return Values

Returns a new QuickHashIntHash.

### Examples

Example #3 QuickHashIntHash::loadFromFile() example

    <?php
    $file = dirname( __FILE__ ) . "/simple.hash";
    $hash = QuickHashIntHash::loadFromFile(
        $file,
        QuickHashIntHash::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