note 92953 modified in function.hexdec by danbrown
| From: | danbrown@php.net | Date: | Thu, 06 May 2010 15:47:35 +0000 |
| Subject: | note 92953 modified in function.hexdec by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-169018@lists.php.net to get a copy of this message | ||
I made these functions to pack up to 64 ID's into a mysql unsigned bigint.
ID's cannot repeat, must be <= bit's limit and > 0.
The functions uses php 32 bit's int as unsigned because we don't actually read the number,
just the bits. Then 0xFFFFFFFF display -1 but the bit's are there (tested with linux 2.6 i686
and x86_64)
---
This is an other way to make hex to bin conversions:
<?php
function hexbin($hex, $padding = false)
{
// Validation
$hex = preg_replace('/^(0x|X)?/i', '', $hex);
$hex = preg_replace('/[[:blank:]]/', '', $hex);
if(empty($hex))
{
$hex = '0';
}
if(!preg_match('/^[0-9A-F]*$/i', $hex))
{
trigger_error('Argument is not a hex', E_USER_WARNING);
return false;
}
// Conversion
$bin = '';
$hex = array_reverse(str_split($hex));
foreach($hex as $n)
{
$n = hexdec($n);
for($i = 1; $i <= 8; $i <<= 1)
{
$bin .= ($i & $n)? '1' : '0';
}
if($padding)
{
$bin .= ' ';
}
}
return ltrim(strrev($bin));
}
// Tests
echo "<b>Debug:</b> <pre>";
// Randomly choosed padded number
var_dump(hexbin('00FF FF8F 7F3F FF1F', true));
// string(79) "0000 0000 1111 1111 1111 1111 1000 1111 0111 1111 0011 1111 1111 1111 0001
1111"
// Yellow RGB
var_dump(hexbin('0xF8F800'));
// string(24) "111110001111100000000000"
// Green RGB (padded)
var_dump(hexbin('0x008800', true));
//string(29) "0000 0000 1000 1000 0000 0000"
die("\n<br>debug");
?>
Have fun ;D
--was--
I've messed up a thing on my last message...
Replace: $hex = preg_replace('/\b/', '', $hex);
By: $hex = preg_replace('/[[:blank:]]', '', $hex);
If you don't do it, spaces will not be removed and you may have problems if you send a padded
hex string
---
This is an other way to make hex to bin conversions:
<?php
function hexbin($hex, $padding = false)
{
// Validation
$hex = preg_replace('/^(0x|X)?/i', '', $hex);
$hex = preg_replace('/[[:blank:]]/', '', $hex);
if(empty($hex))
{
$hex = '0';
}
if(!preg_match('/^[0-9A-F]*$/i', $hex))
{
trigger_error('Argument is not a hex', E_USER_WARNING);
return false;
}
// Conversion
$bin = '';
$hex = array_reverse(str_split($hex));
foreach($hex as $n)
{
$n = hexdec($n);
for($i = 1; $i <= 8; $i <<= 1)
{
$bin .= ($i & $n)? '1' : '0';
}
if($padding)
{
$bin .= ' ';
}
}
return ltrim(strrev($bin));
}
// Tests
echo "<b>Debug:</b> <pre>";
// Randomly choosed padded number
var_dump(hexbin('00FF FF8F 7F3F FF1F', true));
// string(79) "0000 0000 1111 1111 1111 1111 1000 1111 0111 1111 0011 1111 1111 1111 0001
1111"
// Yellow RGB
var_dump(hexbin('0xF8F800'));
// string(24) "111110001111100000000000"
// Green RGB (padded)
var_dump(hexbin('0x008800', true));
//string(29) "0000 0000 1000 1000 0000 0000"
die("\n<br>debug");
?>
Have fun ;D
http://php.net/manual/en/function.hexdec.php