Snippet para transformar campos BLOB (MySQL) em imagens físicas no disco local.

snippet_BlobToImage.php

<?php

	mysql_connect("localhost","root","root");
	mysql_select_db("db");
  
	$qryBlob = "SELECT data FROM tb_imagens limit 1";
	$resBlob = mysql_query($qryBlob) or die('Error, query failed');
  
	while($row = mysql_fetch_array($resBlob)) {
    		$imgEncode = base64_encode($row['data']);
    		$dirImg = 'img/nomedoarquivo.jpg';
  		$img = imagecreatefromstring(base64_decode($imgEncode)); 
    		if($img != false) { 
      			imagejpeg($img, $dirImg); 
    		}   
	}

?>