这段代码用PHP基准格式写应该是怎样的

这段代码用PHP标准格式写应该是怎样的
在公用PHP文件里做了个判断，需要混排PHP和HTML，自己不会写，麻烦大家帮忙改写一下这段，用PHP的标准写法是怎样的：

PHP code

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<?php if $id=1
{ 
    echo "<title> $row['p_name']; - 欢迎光临!
       <meta name="keywords" content="$row['p_name'];,关键字测试">
           <meta name="description" content="$row['p_name'];,描述测试"> 
          ";
}
else
{
     echo "<title>Welcome</title>
       <meta name="keywords" content="关键字测试">
           <meta name="description" content="描述测试"> 
          ";
}
?>

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PHP code

<?php if( $id === 1 )
{ 
    echo "html
       <title> {$row['p_name']} - 欢迎光临!
       <meta name='\"keywords\"' content="\"{$row['p_name']},关键字测试\"">
       <meta name='\"description\"' content="\"{$row['p_name']},描述测试\""> ";
}
else
{
     echo "
       <title>Welcome</title>
       <meta name='\"keywords\"' content='\"关键字测试\"'>
       <meta name='\"description\"' content='\"描述测试\"'>";
}
?>
<br><font color="#e78608">------解决方案--------------------</font><br><?php <br />$title = ''; $keywords = ''; $description = '';<br>if($id==1){<br>	$title = $row['p_name'];<br>	$keywords = $row['p_name'];<br>	$description = $row['p_name'];<br>}?><br><title><?php echo $title;?></title><br><meta name="keywords" content="<?php echo $keywords;?>,关键字测试"><br><meta name="description" content="<?php echo $description;?>,关键字测试">
<br><font color="#e78608">------解决方案--------------------</font><br>- -  傻了,上面第一行应该是$title = 'Welcome' <div class="clear">
                 
              
              
        
            </div>

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