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The ereg() function is gone

with one comment

Alas, poor ereg() I abused you well. PHP 5.3 has deprecated ereg() and now we must move forward with preg_match(). Along with that change, somebody asked me to show how to upload images to the file system as opposed to the database. Personally, I think they should be stored in the database.

With my bias toward databases, I threw in a virtual directory mapping in a MySQL database because it doesn’t natively support an Oracle equivalent BFILE data type. You can see this older post how to use the DBA_DIRECTORIES view in Oracle to mimic this behavior.

Naturally, MySQL is the preferred database of the person asking the question. You could also implement this exactly the same in Oracle but you really don’t want to do so. Using Oracle’s virtual directories has it’s own pre-built set of security features. They provide a more robust solution.

The code is presented as follows (setup for MySQL instructions):

  1. Create and seed the DIRECTORY table in MySQL:
-- Create a directory table.
CREATE TABLE directory
( directory_id   INT PRIMARY KEY AUTO_INCREMENT
, virtual_name   VARCHAR(30)
, directory_name VARCHAR(60));
 
-- Seed the table with a virtual directory mapping.
INSERT INTO directory VALUES ( NULL,'CMS_IMAGES','C:\\Data' );
  1. Create a MySQLCredentials.inc credentails file for inclusion in the PHP program:
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<?php
  // Connection variables.
  define('HOSTNAME',"localhost");
  define('USERNAME',"student");
  define('PASSWORD',"student");
  define('DATABASE',"sampledb");
?>
  1. Create the PHP uploading program, named MySQLFileUpload.php:
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<?php
  // Set database credentials.
  include_once("MySQLCredentials.inc");
 
  // Declare input variables.
  $id = (isset($_POST['id'])) ? $_POST['id'] : 1021;
 
  // Upload a file to server in a mapped physical drive location.
  if (process_uploaded_file(map_virtual_directory($id)))
    print "Successfully Uploaded the file.<br />";
 
  // Map a virtual directory to a physical directory.
  function map_virtual_directory($virtual) {
 
    // Return successful attempt to connect to the database.
    if (!$c = @mysqli_connect(HOSTNAME,USERNAME,PASSWORD,DATABASE)) {
 
      // Print user message.
      print "Sorry! The connection to the database failed. Please try again later.";
 
      // Return error message.
      print mysqli_error();
 
      // Kill the resource.
      die();
    }
    else {
 
      // Initialize a statement in the scope of the connection.
      $stmt = mysqli_stmt_init($c);
 
      // Declare a case insensitive dynamic SQL statement.
      $sql = "SELECT directory_name FROM directory WHERE virtual_name = UCASE(?)";
 
      // Prepare the statement.
      if (mysqli_stmt_prepare($stmt,$sql)) {
 
        // Bind the input parameter to the prepared statement.
        mysqli_stmt_bind_param($stmt,'s',$virtual);
 
        // Execute the prepared statement.
        if (mysqli_stmt_execute($stmt)) {
 
          // Bind the result to a local variable.
          mysqli_stmt_bind_result($stmt,$directory);
 
          // FetchPrepare statement and link it to a connection.
          while (mysqli_stmt_fetch($stmt))
            return $directory;
        }
        else
          // Return error message.
          print mysqli_error();
      }
      else
        // Return error message.
        print mysqli_error();
 
          // Disconnect from database.
      mysqli_close($c);
    }
  }
 
  // Manage file upload.
  function process_uploaded_file($directory) {
 
    /* Assume the application may allow a virtual directory with a trailing backslash or forward
       slash to be stored in the database, and manage both scenarios across Windows and Linux. */
    if (preg_match(".Win32.",$_SERVER["SERVER_SOFTWARE"]))
      if (preg_match("/\b\\\/",$directory));
      else if (preg_match("/\b\//",$directory)) {
        $directory = substr($directory,0,strlen($directory)-1);
        $directory = $directory."\\";
      }
      else $directory = $directory."\\";
    else
      if (preg_match("/\b\//",$directory))
        $directory = substr($directory,0,strlen($directory)-1);
      else
        $directory = $directory."/";  
 
    // Check for, move uploaded file, and confirm processing.
    if (is_uploaded_file($_FILES['userfile']['tmp_name'])) {
 
      // Move temporary cache into a file directory with the uploaded file name.
      move_uploaded_file($_FILES['userfile']['tmp_name'],$directory.$_FILES['userfile']['name']);
 
      // Remove this from real code, it's here for example only. ;-)
      print "Uploaded [".$_FILES['userfile']['name']."] to".$directory."<br />";
 
      // Return true to encapsulate the functional logic on success.
	    return true;
    }
    else
      // Return false to encapsulate the functional logic on failure.
	    return false;
  }
?>
  1. Create a web page to test it:
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<html>
<head>
<title>
  UploadFileFormMySQL.htm
</title>
</head>
<body>
<form id="uploadForm"
      action="MySQLFileUpload.php"
      enctype="multipart/form-data"
      method="post">
  <table border=0 cellpadding=0 cellspacing=0>
    <tr>
      <td width=125>Item Number</td>
      <td>
        <input id="id" name="id" type="text">
      </td>
    </tr>
    <tr>
      <td width=125>Select File</td>
      <td>
        <input id="uploadfilename" name="userfile" type="file">
      </td>
    </tr>
    <tr>
      <td width=125>Click Button to</td>
      <td><input type="submit" value="Upload File"></td>
    </tr>
  </table>
</form>
</body>
</html>

Hope this helps a few folks. I imagine that the prepared statement with bound variables may help a few folks because it’s not found (at writing) on the php.net web site.

Written by maclochlainn

December 29th, 2009 at 2:03 am

Posted in LAMP,Linux,MAMP,PHP,Zend

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