PHP将image转换为base64字符串

下面的php代码将图片转换成base64格式的字符串：

<title>Image to Base64 String</title>
<fieldset>
    <legend>Image to Base64 String</legend>
        <center>
        <form name="select_all">
                <?php
                /**
 * @author vir0e5 a.k.a banditc0de
 * @copyright 2010 by vir0e5
 * @authorurl http://facebook.com/vir0e5.vbs
 * @Blog http://banditc0de.blogspot.com
  This code will help you to learn how we can convert an image into a base64 string!!
 */
                    echo"<h3><p>Image</p></h3>";
                    //$file = File Image yang ingin di encode 
                    //Filetype: JPEG,PNG,GIF
                    $file = "encode.jpg";
                    if($fp = fopen($file,"rb", 0))
                    {
                    $gambar = fread($fp,filesize($file));
                    fclose($fp);

                    $base64 = chunk_split(base64_encode($gambar));
                    //Result
                    $encode = '<img src="data:image/jpg/png/gif;base64,' . $base64 .'" >';
                    echo $encode;
                    }    
                ?>
                <br><textarea  name="text_area" rows="20" cols="70"><? echo $encode; ?></textarea>
                <p><input type="button" value="Select All Code" onClick="javascript:this.form.text_area.focus();this.form.text_area.select();"></p>
        </form>
        </center>
    </fieldset>