لماذا كود upload لايحمل أكثر من 100 كيلو بايت

<html>
<head>
<title>Listing 10.12 A File Upload Script</title>
</head>
<body>
<div>
<?php
if ( isset( $_FILES['fupload'] ) ) {

    print "name: ".     $_FILES['fupload']['name']       ."<br />";
    print "size: ".     $_FILES['fupload']['size'] ." bytes<br />";
    print "temp name: ".$_FILES['fupload']['tmp_name']   ."<br />";
    print "type: ".     $_FILES['fupload']['type']       ."<br />";
    print "error: ".    $_FILES['fupload']['error']      ."<br />";


        $source = $_FILES['fupload']['tmp_name'];
        $target = "upload/".$_FILES['fupload']['name'];
        move_uploaded_file( $source, $target );// or die ("Couldn't copy");
        $size = getImageSize( $target );
      //print $id;
}
?>
</div>
<form enctype="multipart/form-data"
    action="<?php print $_SERVER['PHP_SELF']?>" method="post">
<p>
<input type="hidden" name="MAX_FILE_SIZE" value="102400" />
<input type="file" name="fupload" /><br/>
<input type="submit" value="upload!" />
</p>
</form>
</body>
</html>