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Example #1:

<a href="this-file.php?action=case1">Case1</a> | <a href="this-file.php?action=case2">Case2</a> | <a href="this-file.php?action=dummy">Dummy</a>

<?php
switch ($action)
{

case "case1" :
echo " This is case1 ";
break;

case "case2" :
echo " This is case2";
break;

case "dummy" :
// do something
break;
}
?>               complete Switch-Case-Menu: check 'n try | download

Example #2:

<a href="this-file.php?action=look">FileExplorer</a>

<?php
switch ($action)
{

case "look" : // look for files
$handle=opendir('.');
while ($file = readdir ($handle)) {
if ($file != "." && $file != "..")
{echo "<a href='$PHP_SELF?action=delete&file=$file'>[Delete]</a> $file \n,
";}
}
closedir($handle);
break;

case "delete" :
unlink("$file");
echo "$file deleted!";
break;

}
?>