Show/Hide Div Based on URL (PHP)

- 
if (strpos($_SERVER['REQUEST_URI'], "index.php") >= 0) {
  $left_col_class = "showme";
}
else {
  $left_col_class = "hideme";
}

// Your html...
<div id='left_col' class='<?php echo $left_col_class; ?>'>contents</div>

// Your CSS
.hideme { display: none; }
.showme { display: block; }

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