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css - Hiding a Div using php

I am currently hiding a div based on an if statement. The method I use is, use echo out a css style of display: none

Here is what I am doing specifically:

<style>
  #content{
    <?php
      if(condition){
          echo 'display:none';
      }
    ?>
  }
</style>
<body>
    <div id="content">
       Foo bar
    </div>
</body>

My question being, Is this a good method for a hiding a div? Is it possible that browser cache the style and therefore ignore the echo-ed out css style?

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by (71.8m points)

Using Php in your CSS (Cascade Style Sheet) is not "proper",

Also, You can use Php in your HTML:

<body>
    <?php if (condition){ ?>
        <div id="content">
           Foo bar
        </div>
    <?php } ?>
</body>

With this code, div block don't appear, (and you don't use it with JavaScript), You can use this for just hidden your div :

 <body>
    <div id="content" <?php if (condition){ echo 'style="display:none;"'; } ?>>
       Foo bar
    </div>
</body>

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