Just a stupid little script i made when i was bored that can convert a number to binary form and vice versa. There is a working example here:
http://www.schooliez.com/binary.php

By : D1NGO

<?php
if($_GET['t'] == "b1")
{
if($Submit1)
{
makeBinary($binary);
}
else
{
echo <<<FORM
<font size="2" face="Verdana, Arial, Helvetica, sans-serif">Please only choose numbers smaller than 255</font>
<form name="form1" method="post" action="$PHP_SELF?t=b1">
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Convert this number:</font>
<input type="text" name="binary">
</p>
<p>
<input type="submit" name="Submit1" value="Convert">
</p>
</form>
FORM;
}



}
elseif($_GET['t'] == "b2")
{
if($Submit2)
{
if($num1 == 1)
{
$number = 128;
}
if($num2 == 1)
{
$number += 64;
}
if($num3 == 1)
{
$number += 32;
}
if($num4 == 1)
{
$number += 16;
}
if($num5 == 1)
{
$number += 8;
}
if($num6 == 1)
{
$number += 4;
}
if($num7 == 1)
{
$number += 2;
}
if($num8 == 1)
{
$number += 1;
}
echo "<font face=\"Verdana\" size=\"2\">The converted number is: $number</font>";
}
else{
echo <<<FORM
<font face="Verdana" size="2">Place the number "1" or "0" in the boxes</font>
<form name="form1" method="post" action="$PHP_SELF?t=b2">
<table width="431" border="0" cellpadding="0" cellspacing="0">
<!--DWLayoutTable-->
<tr>
<td height="25" colspan="2" valign="top"> <input name="num1" type="text" size="1" maxlength="1">
<input name="num2" type="text" size="1" maxlength="1"> <input name="num3" type="text" size="1" maxlength="1">
<input name="num4" type="text" size="1" maxlength="1"> <input name="num5" type="text" size="1" maxlength="1">
<input name="num6" type="text" size="1" maxlength="1"> <input name="num7" type="text" size="1" maxlength="1">
<input name="num8" type="text" size="1" maxlength="1"> </td>
</tr>
<tr>
<td width="110" height="24" valign="top"><input type="submit" name="Submit2" value="Convert"></td>
<td width="321">&nbsp;</td>
</tr>
<tr>
<td height="25">&nbsp;</td>
<td>&nbsp;</td>
</tr>
</table>
</form>
FORM;
}

}
else
{
echo <<<FORM
<table width="591" border="0" cellpadding="5" cellspacing="1" bgcolor="#000000">
<!--DWLayoutTable-->
<tr>
<td height="32" colspan="3" valign="middle" bgcolor="#FFFFFF"><div align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Binary
Conversions</font></div></td>
</tr>
<tr>
<td width="140" height="24" valign="top" bgcolor="#FFFFFF"><font size="1" face="Verdana, Arial, Helvetica, sans-serif">Decimal
to Binary:</font></td>
<td width="89" valign="top" bgcolor="#FFFFFF"><form name="form1" method="post" action="$PHP_SELF?t=b1"><input type="submit" name="Submit" value="Go"></form></td>
<td width="328" rowspan="3" valign="top" bgcolor="#FFFFFF"><font color="#CC0000" size="1" face="Verdana, Arial, Helvetica, sans-serif">Project
designed and created by Rowan Hemsley</font></td>
</tr>
<tr>
<td height="24" valign="top" bgcolor="#FFFFFF"><font size="1" face="Verdana, Arial, Helvetica, sans-serif">Binary
to Decimal:</font></td>
<td valign="top" bgcolor="#FFFFFF"><form name="form1" method="post" action="$PHP_SELF?t=b2"><input type="submit" name="Submit" value="Go"></form></td>
</tr>
<tr>
<td height="2"></td>
<td></td>
</tr>
</table>
FORM;
}

function makeBinary($x)
{
if(($x - 128) >= 0)
{
$binary = '1';
$x = $x - 128;
}
else
{
$binary = '0';
}

if(($x - 64) >= 0)
{
$binary = "$binary 1";
$x = $x - 64;
}
else
{
$binary = "$binary 0";
}

if(($x - 32) >= 0)
{
$binary = "$binary 1";
$x = $x - 32;
}
else
{
$binary = "$binary 0";
}

if(($x - 16) >= 0)
{
$binary = "$binary 1";
$x = $x - 16;
}
else
{
$binary = "$binary 0";
}

if(($x - 8) >= 0)
{
$binary = "$binary 1";
$x = $x - 8;
}
else
{
$binary = "$binary 0";
}

if(($x - 4) >= 0)
{
$binary = "$binary 1";
$x = $x - 4;
}
else
{
$binary = "$binary 0";
}

if(($x - 2) >= 0)
{
$binary = "$binary 1";
$x = $x - 2;
}
else
{
$binary = "$binary 0";
}

if(($x - 1) >= 0)
{
$binary = "$binary 1";
$x = $x;
echo "<font size=\"2\" face=\"Verdana, Arial, Helvetica, sans-serif\">$binary</font>";
}
else
{
$binary = "$binary 0";
echo "<font size=\"2\" face=\"Verdana, Arial, Helvetica, sans-serif\">$binary</font>";
}
}
?>

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