PNG to Jpeg in PHP using GD library

<?php
function png2jpg($originalFile, $outputFile, $quality) {
    $image = imagecreatefrompng($originalFile);
    imagejpeg($image, $outputFile, $quality);
    imagedestroy($image);
}
png2jpg("img/test.png", "img/".time().".jpg", 100);
if ($handle = opendir('img/')) {
	$i=0;
   while (false !== ($entry = readdir($handle))) {
      if ($entry != "." && $entry != "..") {
         echo "<img src='img/$entry' width=150 height=100>    ";
			if($i%10==0 && $i!=0){
				echo "<br>";
			}
			$i++;
      }
   }
   closedir($handle);
}
?>

Multple checkbox selected or not

<script type="text/javascript" src='jquery.js'></script>
<script type="text/javascript">
$(document).ready(function() {
$('#extend_auto_expired').click(function(){
$("input[type=checkbox]:checked").each(function() {
alert( $(this).val() );
});
});
});
</script>
<center>
<form name='ck'>
<?php
for($r=0; $r<10;$r++){
echo "<input type='checkbox' name='t[]' value='$r'>$r<br>";
}
?>
<input type="button" id="extend_auto_expired" value="Extend auto expired" class="buttongreen" name="Submit">
</form>
<center>

How to find disk space in PHP?

<?php
$bytes = disk_total_space(".");
$si_prefix = array( 'B', 'KB', 'MB', 'GB', 'TB', 'EB', 'ZB', 'YB' );
$base = 1024;
$class = min((int)log($bytes , $base) , count($si_prefix) - 1);
//echo $bytes . '<br />';
$total = sprintf('%1.2f' , $bytes / pow($base,$class)) . ' ' . $si_prefix[$class];

$bytes = disk_free_space(".");
$si_prefix = array( 'B', 'KB', 'MB', 'GB', 'TB', 'EB', 'ZB', 'YB' );
$base = 1024;
$class = min((int)log($bytes , $base) , count($si_prefix) - 1);
//echo $bytes . '<br />';
$free = sprintf('%1.2f' , $bytes / pow($base,$class)) . ' ' . $si_prefix[$class];

   $used = (float)$total-(float)$free;
echo "Total Space : $total <br/> Available Space : $free <br/> Used Space : $used ".$si_prefix[$class];
?>