PHP把数据导出为CVS格式的类

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/////////////
//第一次调用类,给csv的路径
#$b=new CsvFieldDump("./sample.csv");
//余下的这些函数是可选的-这取决于你想要什么
#$b->dump_headers();
#$b->dump_column_by_name(array("Description", "Code"));
#$b->dump_column_by_name("Code");
#$b->dump_column(array(1, 2, 3));
#$b->dump_column(3);

class CsvFieldDump  {
var $headers;
var $fieldnum;
function CsvFieldDump($infile){
if(empty($infile)){
die("You must specify a csv file to read\n");
}
if(!file_exists($infile)){
die("$infile doesn't exist!\n");
}
$this->infile  = $infile;
$this->fieldnum = $field;
$this->createFile=0;
return(true);
}
var $headers=array();
function dump_headers($dumptoscreen=1){
$this->fd=fopen($this->infile, "r") or die("Couldn't open csv file $file");
$count=0;
while($data = fgetcsv($this->fd, 1000, ",") ){
if(!$count){
if($dumptoscreen){
print_r($data);
}
$this->headers=$data;
}
$count=1;
}
return($this->headers);
}
function dump_column($num){

$this->fieldnum = $num;
$this->fd=fopen($this->infile, "r") or die("Couldn't open csv file $file");
$count=0;
while($data = fgetcsv($this->fd, 1000, ",")){
$array=array();
if(is_array($this->fieldnum)){
foreach($this->fieldnum as $num){
$array[]=$data[$num];
}
}else{
$array = array($data[$this->fieldnum]);
}
$this->write_line($array);
}
}

var $colname;
var $headers_flip;
function dump_column_by_name($name){
if(!isset($name)){
die("No field name specified");
}
$this->colname=$name;
$this->dump_headers(0);
$this->headers_flip = array_flip($this->headers);
if(is_array($this->colname)){
foreach($this->colname as $n){
$array[] = $this->headers_flip[$n];
}
}else{
$array[] = $this->headers_flip[$this->colname];
}
$this->dump_column($array);
}
function write_line($data){
$string="";
$num=count($data);
for($x=0;$x<$num;$x++){
$string.=$data[$x];
if($x<$num-1){
$string.=",";
}
}
echo $string."\n";
}
}

/////////////////////// make it think its a c program :)
if(isset($argv[1])){
$filename = $argv[count($argv)-1];
if($argv[1] == "-h"){
render_help();
die();
}else{
$b=new CsvFieldDump($filename);
}
$x=0;
foreach($argv as $opt){
switch($opt) {
case "df":
case "-df" :
$number = $argv[$x+1];
if(strstr($number, ",")){
$numbers = explode(",",$number);
}else{
$numbers = $number;
}
$b->dump_column($numbers);
break;
case "-dn":
$number = $argv[$x+1];
if(strstr($number, ",")){
$names = explode(",",$number);
}else{
$names = $number;
}
$b->dump_column_by_name($names);
break;
case "--help":
case "-h" :
render_help();
break;
case "-dh" :
$b->dump_headers();
break;
}
$x++;
}
}
function render_help(){
echo "CsvFieldDump version 0.0.0.1 by mark fate_amendable_to_change@yahoo.com
-df <n>    = dumps field(s) number n - also (accepts comma delimited list for multiple field numbers eg: -df 1,2,3)
-dn <N>    = dumps field(s) named N (accepts comma delimited list for multiple names eg: -dn Code,Desc)
-dh        = dumps csv headers
";
}