php递归删除目录所有文件-PHP源码

function tree($directory)
{
$mydir=dir($directory);
echo "

";
while($file=$mydir->read()){
if((is_dir("$directory/$file")) and ($file!=".") and ($file!=".."))
{echo "
• $file
";
tree("$directory/$file");
}
else{
$a = explode('.',$file);
if($a[1] == 'html' || $a[1] == 'htm')
{
//unlink($file);
echo "
• $file
";
}


}
}
echo "

echo "

目录为粉红色