ASCIIコード表

<?php
//　特殊記号
$sp = &#91;'NULL','SOH','STX','ETX','EOT','ENQ','ACK','BEL','BS','HT','LF','VT',
        'FF','CR','SO','SI','DLE','DC1','DC2','DC3','DC4','NAL','SYN','ETV','CAN'm
    'EM','SUB','ESC','FS','GS','RS','US','SPC'&#93;;
    $sp&#91;127&#93; = 'DEL';

// header
    $html = "<tr><th></th>";
    for($j = 0; $j < 16; $j++){
    $html .= "<th>".sprintf("%X",$j)."</th>";
    }
    $html .= "</tr>";

// characters
    for ($i = 0; $i <= 7; $i++){
    $html .= "<tr><th>{$i}x</th>";
        for ($j = 0; $j < 16; $j++){
            $code = ($i * 16) + $j;
            $ch = isset($sp&#91;$code&#93;) ? $sp&#91;$code&#93; : chr($code);
            $html .= "<td>$ch</td>";
        }
        $html .= "</tr>";
    }

echo <<< EOS
<style>
    * { margin:0; padding:0; }
    table { margin: 12px; }
    td, th {
        font-size: 12px, padding: 4px;
    width: 32px; text-align: center;
        border-bottom: 1px solid silver;
        border-right: 1px solid silver;
    }
    th { color: white; background-color: blue; }
</style>
<table>
$html
</table>
    EOS;