PHP 数据表结构的显示

/**
* 生成mysql数据字典
*/
header("Content-type:text/html;charset=utf-8");
//配置数据库
$dbserver   = "127.0.0.1";
$dbusername = "root";
$dbpassword = "123456";
$database      = "xxxxxxxxxx";
//标题
$title = strtoupper($database).'数据库字典';

$mysql_conn = @mysql_connect("$dbserver", "$dbusername", "$dbpassword") or die("Mysql connect is error.");
mysql_select_db($database, $mysql_conn);
mysql_query('SET NAMES utf8', $mysql_conn);
$table_result = mysql_query('show tables', $mysql_conn);
//取得所有的表名
while ($row = mysql_fetch_array($table_result)) {
$tables[]['TABLE_NAME'] = $row[0];
}

//循环取得所有表的备注及表中列消息
foreach ($tables AS $k=>$v) {
$sql  = 'SELECT * FROM ';
$sql .= 'INFORMATION_SCHEMA.TABLES ';
$sql .= 'WHERE ';
$sql .= "table_name = '{$v['TABLE_NAME']}'  AND table_schema = '{$database}'";
$table_result = mysql_query($sql, $mysql_conn);
while ($t = mysql_fetch_array($table_result) ) {
$tables[$k]['TABLE_COMMENT'] = $t['TABLE_COMMENT'];
}

$sql  = 'SELECT * FROM ';
$sql .= 'INFORMATION_SCHEMA.COLUMNS ';
$sql .= 'WHERE ';
$sql .= "table_name = '{$v['TABLE_NAME']}' AND table_schema = '{$database}'";

$fields = array();
$field_result = mysql_query($sql, $mysql_conn);
while ($t = mysql_fetch_array($field_result) ) {
$fields[] = $t;
}
$tables[$k]['COLUMN'] = $fields;
}
mysql_close($mysql_conn);

$html = '';
//循环所有表
foreach ($tables AS $k=>$v) {
//$html .= '<p><h2>'. $v['TABLE_COMMENT'] . ' </h2>';
$html .= '<table width="80%" border="1" cellspacing="0" cellpadding="0" align="center">';
$html .= '<caption>' . strtoupper($v['TABLE_NAME']) .'  '. $v['TABLE_COMMENT']. '</caption>';
$html .= '<tbody><tr><th>字段名</th><th>数据类型</th><th>默认值</th>
<th>允许非空</th>
<th>自动递增</th><th>备注</th></tr>';
$html .= '';

foreach ($v['COLUMN'] AS $f) {
$html .= '<tr><td class="c1">' . strtoupper($f['COLUMN_NAME']) . '</td>';
$html .= '<td class="c2">' . $f['COLUMN_TYPE'] . '</td>';
$html .= '<td class="c3"> ' . $f['COLUMN_DEFAULT'] . '</td>';
$html .= '<td class="c4"> ' . $f['IS_NULLABLE'] . '</td>';
$html .= '<td class="c5">' . ($f['EXTRA']=='auto_increment'?'是':' ') . '</td>';
$html .= '<td class="c6"> ' . $f['COLUMN_COMMENT'] . '</td>';
$html .= '</tr>';
}
$html .= '</tbody></table></p>';
}