Reordering lines in text file with PHP

Here is an example of the contents of a text file I am using:
------------menu.txt------------------
Home
Specs
Specials
Fishing
Cost
Contact
Pictures
------------------------------------
I need to change the order of these lines using PHP. For example, if someone clicks a 'Move Up' button next to the word "Specials" on a page, it will swap locations with "Specs". If they click a 'Move Down' button, it will swap places within the file with "Fishing".

I would also like to ensure that errors down appear if the item is at the top but they press 'Move up' (and the same for the last item moving down).
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seandolanAsked:
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Shahzad Fateh AliWeb Solutions Architect & Technical Project Manager- VentureDive (Pvt) LtdCommented:
Hi,

Here is the php code, try writing javascript for it and it will start working,

// post reordered menu list and write into the file
 
if(isset($_REQUEST['update'])){
	$menu = $_REQUEST['menu'];
	$fp = fopen('menu.txt','w+');
	foreach($menu as $m){
		@fputs($fp,$m);
	}
fclose($fp);
}
 
//read from file and display html
 
$fp = fopen('menu.txt','r');
$menu = array();
while(!feof($fp)){
 
	$menu[] = fgets($fp);
}

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seandolanAuthor Commented:
I don't understand how that code moves a line up or down or how it knows what to reorder. Can you please explain it so that I can use this code.
0
Shahzad Fateh AliWeb Solutions Architect & Technical Project Manager- VentureDive (Pvt) LtdCommented:
Here you are.
Cheers

<?
// post reordered menu list and write into the file
 
if(isset($_REQUEST['update'])){
        $menu = explode(',',$_REQUEST['menu']);
        $fp = fopen('menu.txt','w+');
        foreach($menu as $m){
                @fputcsv($fp,array($m),' ',' ');
        }
fclose($fp);
}
 
//read from file and display html
 
$fp = fopen('menu.txt','r');
$menu = array();
while(!feof($fp)){
 
 		$t = trim(fgets($fp));
        if($t != '') $menu[] = $t;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Reording</title>
<script language="javascript" type="text/javascript">
var menu = ["<?=implode('","',$menu);?>"];
 
	function reorder(index,move){
		var frm = document.getElementById('myForm');
		var inputmenu = document.getElementById('menu');
		
		switch(move){
			case "up":
				if(index == 0) {alert("You cannot move up"); return false;}
				else{
					var tmp = menu[index-1];
					menu[index-1] = menu[index];
					menu[index] = tmp;
					inputmenu.value = menu.toString()
					frm.submit();
				}
				break;
			
			case "down":
				if(index == menu.length-1) {alert("You cannot move down"); return false;}
				else{
					var tmp = menu[index+1];
					menu[index+1] = menu[index];
					menu[index] = tmp;
					inputmenu.value = menu.toString();
					frm.submit();
				}
				break;
		}
	}
</script>
</head>
<body>
<form id="myForm" method="post">
<input type="hidden" id="menu" name="menu" />
<input type="hidden" id="update" name="update" value="1" />
<? $i=0;
	foreach($menu as $value){
?>
<?=$value;?><input type="button" value="Up" onclick="reorder(<?=$i;?>,'up')" /><input type="button" value="Down" onclick="reorder(<?=$i;?>,'down')" /><br />
<?	$i++;}?>
</form>
</body>
</html>

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seandolanAuthor Commented:
Thanks! Great answer!
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