Using PHP to implement Windows Explorer-style tree menu

window| menu Below is a tree menu style similar to Windows Explorer
Include the following script in your page
Also need to intercept some GIF pictures from the Explorer, see the comments in the script
The format of the menu structure file is:
Tree Level|item text|item link|link target|last item in subtree
For example
. <b>demo Menu</b>|javascript:alert (' This are the Demo menu for Treemenu 1.0 ');
.. <b> Catalogue 1</b>
...<b> subdirectory 1.1</b>
... item 1.1.1|javascript:alert (' Item 1.1.1 ');
... item 1.1.2|javascript:alert (' Item 1.1.1 ');
... item 1.2|javascript:alert (' Item 1.2 ');
... item 1.3|javascript:alert (' Item 1.3 ');
.. <b> Sub-Directory 2</b>
... item 2.1|javascript:alert (' Item 2.1 ');
... item 2.2|javascript:alert (' Item 2.2 ');
...<b> subdirectory 2.3</b>
... item 2.3.1|javascript:alert (' Item 2.3.1 ');
... item 2.3.2|javascript:alert (' Item 2.3.2 ');
<?php
File:tremenu.inc
PHP Treemenu
/////////////////
Initialization//
/////////////////

$treefile = "Demomenu.txt";//Set a file with a menu structure

if (Isset ($PATH _info))
$script = $PATH _info;
Else
$script = $SCRIPT _name;

The following picture can intercept the map of the corresponding location in Windows Explorer

$img _expand = "tree_expand.gif";//form as Extensible node in Resource Manager +
$img _collapse = "tree_collapse.gif";//in the form of an extended node in Resource Manager-
$img _line = "tree_vertline.gif";//Shaped like |
$img _split = "tree_split.gif";//Shaped like |
$img _end = "tree_end.gif";/shaped like L
$img _leaf = "tree_leaf.gif";//form as O
$img _SPC = "tree_space.gif";//Blank chart

The following is a menu processing script

$maxlevel = 0;
$cnt = 0;

$FD = fopen ($treefile, "R");
if ($fd ==0) die ("Treemenu.inc:Unable to open File". $treefile);
while ($buffer = Fgets ($FD, 4096))
{
$tree [$cnt][0]=strspn ($buffer, ".");
$tmp =rtrim (substr ($buffer, $tree [$cnt][0]));
$node =explode ("|", $tmp);
$tree [$cnt][1]= $node [0];
$tree [$cnt][2]= $node [1];
$tree [$cnt][3]= $node [2];
$tree [$cnt][4]=0;
if ($tree [$cnt][0] > $maxlevel) $maxlevel = $tree [$cnt][0];
$cnt + +;
}
Fclose ($FD);

for ($i =0; $i <count ($tree); $i + +)
{
$expand [$i]=0;
$visible [$i]=0;
$levels [$i]=0;
}

if ($p!= "")
$explevels = Explode ("|", $p);
$i = 0;
while ($i <count ($explevels))
{
$expand [$explevels [$i]]=1;
$i + +;
}

$lastlevel = $maxlevel;
For ($i =count ($tree)-1; $i >=0; $i--)
{
if ($tree [$i][0] < $lastlevel)
for ($j = $tree [$i][0]+1; $j <= $maxlevel; $j + +)
$levels [$j]=0;
if ($levels [$tree [$i][0]]==0)
{
$levels [$tree [$i][0]]=1;
$tree [$i][4]=1;
}
Else
$tree [$i][4]=0;
$lastlevel = $tree [$i][0];
}

for ($i =0; $i < count ($tree); $i + +)
if ($tree [$i][0]==1)
$visible [$i]=1;
for ($i =0; $i < count ($explevels); $i + +)
{
$n = $explevels [$i];
if ($visible [$n]==1) && ($expand [$n]==1)]
{
$j = $n +1;
while ($tree [$j][0] > $tree [$n][0])
{
if ($tree [$j][0]== $tree [$n][0]+1) $visible [$j]=1;
$j + +;
}
}
}

for ($i =0; $i < $maxlevel; $i + +)
$levels [$i]=1;

$maxlevel + +;

echo "<table cellspacing=0 cellpadding=0 border=0 cols=". ($maxlevel +3). " >\n ";
echo "<tr>";
for ($i =0; $i < $maxlevel; $i + +)
echo "<td width=16></td>";
echo "<td width=100%> </td></tr>\n";
$cnt = 0;
while ($cnt <count ($tree))
{
if ($visible [$cnt])
{
echo "<tr>";
$i = 0;
while ($i < $tree [$cnt][0]-1)
{
if ($levels [$i]==1)
echo "<td><a name= ' $cnt ' ></a></td>";
Else
echo "<td><a name= ' $cnt ' ></a></td>";
$i + +;
}
if ($tree [$cnt][4]==1)
{
echo "<td></td>";
$levels [$tree [$cnt][0]-1]=0;
}
Else
{
echo "<td></td>";
$levels [$tree [$cnt][0]-1]=1;
}

if ($tree [$cnt +1][0]> $tree [$cnt][0])
{

$i = 0; $params = "p=";
while ($i <count ($expand))
{
if ($expand [$i]==1) && ($cnt!= $i) | | ($expand [$i]==0 && $cnt = = $i))
{
$params = $params. $i;
$params = $params. "|";
}
$i + +;
}

if ($expand [$cnt]==0)
echo "<td><a href=\" ". $script. $params." # $cnt \ "></a></td>";
Else
echo "<td><a href=\" ". $script. $params." # $cnt \ "></a></td>";
}
Else
echo "<td></td>";

if ($tree [$cnt][2]== "")
echo "<td colspan=". ($maxlevel-$tree [$cnt][0]). " > ". $tree [$cnt][1]." </td> ";
Else
echo "<td colspan=". ($maxlevel-$tree [$cnt][0]). " ><a href=\ "". $tree [$cnt][2]. " \ "Target=\" ". $tree [$cnt][3]." \ > $tree [$cnt][1]. " </a></td> ";
echo "</tr>\n";
}
$cnt + +;
}
echo "</table>\n";
?>