用PHP实现windows资源管理器风格的树型菜单


　　以下是一个风格类似windows资源管理器的树型菜单 
将下面的脚本包含到你的页面中 
另外需要从资源管理器中截取一些gif图片,祥见脚本中的注释 
菜单结构文件的格式为: 
tree level|item text|item link|link target|last item in subtree 
例如 
.<b>Demo menu</b>|javascript: alert('This is the demo menu for TreeMenu 1.0'); 
..<b>目录1</b> 
...<b>子目录 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>子目录 2</b> 
...item 2.1|javascript: alert('Item 2.1'); 
...item 2.2|javascript: alert('Item 2.2'); 
...<b>子目录 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 
///////////////// 
// 初始化 // 
///////////////// 

$treefile = "demomenu.txt";//设置有菜单结构的文件 

if(isset($PATH_INFO))  
$script = $PATH_INFO;  
else  
$script = $SCRIPT_NAME;  

//以下图片可截取windows资源管理器中的相应位置的图 

$img_expand = "tree_expand.gif";//形如资源管理器中可扩展节点+ 
$img_collapse = "tree_collapse.gif";//形如资源管理器中已扩展节点- 
$img_line = "tree_vertline.gif";//形如| 
$img_split = "tree_split.gif";//形如|- 
$img_end = "tree_end.gif";//形如L 
$img_leaf = "tree_leaf.gif";//形如o 
$img_spc = "tree_space.gif";//空白图 

//以下是菜单处理脚本 

$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%>&nbsp;</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='$cnt'></a><img src=\"".$img_line."\"></td>";  
else  
echo "<td><a name='$cnt'></a><img src=\"".$img_spc."\"></td>";  
$i++;  
}  
if ($tree[$cnt][4]==1)  
{  
echo "<td><img src=\"".$img_end."\"></td>";  
$levels[$tree[$cnt][0]-1]=0;  
}  
else  
{  
echo "<td><img src=\"".$img_split."\"></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."#$cnt\"><img src=\"".$img_expand."\" 
border=no></a></td>";  
else  
echo "<td><a href=\"".$script.$params."#$cnt\"><img src=\"".$img_collapse."\" 
border=no></a></td>";  
}  
else  
echo "<td><img src=\"".$img_leaf."\"></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";  
?>