Warning in php with csv -

this code

<?php  ini_set("display_errors", true);  $inputfilename = 'hw8.csv';  $outputfilename = 'hw8.xml';   // open csv read  $inputfile = fopen($inputfilename, 'rt');   // headers of file  $headers = fgetcsv($inputfile);   // create new dom document pretty formatting  $doc = new domdocument();  $doc->formatoutput = true;   // add root node document  $root = $doc->createelement('rows');  $root = $doc->appendchild($root);   // loop through each row creating <row> node correct data  while (($row = fgetcsv($inputfile)) !== false)  {   $container = $doc->createelement('row');    // $i array index (0,1,2,..) , $header value @ $i   foreach ($headers $i => $header)   {   $child = $doc->createelement($header);   $child = $container->appendchild($child);   $value = $doc->createtextnode($row[$i]);   $value = $child->appendchild($value);   }    $root->appendchild($container);  }    echo $doc->savexml();  

and got warning warning: fopen(input2.csv) [function.fopen]: failed open stream: no such file or directory in /users/csegrad/csv.php on line 9

warning: fgetcsv() expects parameter 1 resource, boolean given in /users/csegrad/csv.php on line 12

warning: fgetcsv() expects parameter 1 resource, boolean given in /users/csegrad/csv.php on line 23

warning: invalid argument supplied foreach() in /users/csegrad/csv.php on line 28