请教PHP中加入HTML 报以下异常，怎么解决

请问PHP中加入HTML 报以下错误，如何解决

PHP code

<!--

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-->echo "<div class="sidebarBlock" style="margin:150 auto; text-align:center;">\n";
<br><br>运行后系统提示<br>Parse error: syntax error, unexpected T_STRING, expecting ',' or ';' in POST.PHP on line 5<br><br>第5行就是上面的代码<br><br><br><font color="#e78608">------解决方案--------------------</font><br>
echo '<div class="sidebarBlock" style="margin:150 auto; text-align:center;">\n';<br><br>echo "<div class='\"sidebarBlock\"' style='\"margin:150' auto text-align:center>\n"; <div class="clear">
                 
              
              
        
            </div>
</div>
</div>
</div>