Question

How to enable my form users to enter apostrophes?

Asked by: evibesmusic

Hello.  I have a simple form that accepts a users first name and last name.  If the user's last name has an apostrophe, my form information will not save into my database.

Example: O'Sullivan > will not save into the DB
Example2: OSullivan > will save into the DB

I've heard of the addslashes() function but do not know how to envoke it properly.  Anyone have an idea on how to do this, when processing my form data?

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Asked On
2009-09-04 at 16:23:16ID24709151
Tags

php

,

mysql

,

apostrophe usage

Topic

PHP Scripting Language

Participating Experts
4
Points
500
Comments
12

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Answers

 

by: wuff1ukPosted on 2009-09-04 at 17:34:37ID: 25264393

When you pass the variables in your mysql insert/update statement, ensure that the variables are enclosed by addslashes. And in the functions that will display the name from the database table you'd then have to use stripslashes to remove them again.

$sql="insert into table set name=".addslashes($_POST['name']).",otherdata=".addslashes($_POST['otherdata']);
 
----
 
echo "Name: ".stripslashes($row['name'])."<br />";

                                              
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by: wuff1ukPosted on 2009-09-04 at 17:42:03ID: 25264408

For mysql it's better to use mysql_real_escape_string though as it's db specific and takes care of some additional characters.

See the PHP doc for further info and examples:
http://uk3.php.net/manual/en/function.mysql-real-escape-string.php
http://uk3.php.net/manual/en/function.addslashes.php

 

by: cxrPosted on 2009-09-04 at 17:49:46ID: 25264450

FYI, it is not necessary to use stripslashes() when you read the data from the database. The added slashes are not stored in the database at all, they are stripped away by mysql when the INSERT statement is parsed.

 

by: Slick812Posted on 2009-09-05 at 11:25:07ID: 25267215

hey evibesmusic, , not wanting to make this confusing, but offering an idea for more recent PHP MySql implementation, since you are learning MySql, you might consider using the newer, more secure,  MySQL Improved Extension , , mysqli

from the MySqli site - Note: If you are using MySQL versions 4.1.3 or later it is strongly recommended that you use this mysqli extension.
mysqli  offers much improved methods for all of the - add slashes and mysql_real_escape_string stuff, but it is a little more to learn, and in my opinion worth the trouble.

you can see an intro tutoral at -
http://devzone.zend.com/article/686
or
http://forge.mysql.com/wiki/Converting_to_MySQLi

 

by: Ray_PaseurPosted on 2009-09-06 at 07:50:34ID: 25270128

@cxr: Except...  
If you have magic_quotes turned on (like I did once), and you are unaware (like I was) and you use addslashes unconditionally (like I did) you can get slashes inserted into your tables.  You don't want them there, of course, so if some idiot (like me) does this to your data base, you can use the stripslashes() to remove these from the character and text strings in the data base.

Experience is a great teacher!

Please see the code from line 57 to 87 in this example.  Best, ~Ray

<?php // RAY_mysql_example_2.php
error_reporting(E_ALL);
 
// IMPORTANT PAGES FROM THE MANUALS
// MAN PAGE: http://us2.php.net/manual/en/ref.mysql.php
// MAN PAGE: http://us2.php.net/manual/en/mysql.installation.php
// MAN PAGE: http://us.php.net/manual/en/function.mysql-error.php
 
// CONNECTION AND SELECTION VARIABLES FOR THE DATABASE
$db_host = "localhost"; // PROBABLY THIS IS OK
$db_name = "??";        // GET THESE FROM YOUR HOSTING COMPANY
$db_user = "??";
$db_word = "??";
 
// OPEN A CONNECTION TO THE DATA BASE SERVER
// MAN PAGE: http://us2.php.net/manual/en/function.mysql-connect.php
if (!$db_connection = mysql_connect("$db_host", "$db_user", "$db_word"))
{
   $errmsg = mysql_errno() . ' ' . mysql_error();
   echo "<br/>NO DB CONNECTION: ";
   echo "<br/> $errmsg <br/>";
}
 
// SELECT THE MYSQL DATA BASE
// MAN PAGE: http://us2.php.net/manual/en/function.mysql-select-db.php
if (!$db_sel = mysql_select_db($db_name, $db_connection))
{
   $errmsg = mysql_errno() . ' ' . mysql_error();
   echo "<br/>NO DB SELECTION: ";
   echo "<br/> $errmsg <br/>";
   die('NO DATA BASE');
}
// IF WE GOT THIS FAR WE CAN DO QUERIES
 
 
 
 
// CREATING A TABLE
$sql = "CREATE TEMPORARY TABLE my_table (
        _key int         NOT NULL AUTO_INCREMENT,
        name varchar(24) NOT NULL DEFAULT '',
        PRIMARY KEY(_key)  )";
$res = mysql_query($sql);
 
// IF mysql_query() RETURNS FALSE, GET THE ERROR REASONS
if (!$res)
{
   $errmsg = mysql_errno() . ' ' . mysql_error();
   echo "<br/>QUERY FAIL: ";
   echo "<br/>$sql <br/>";
   die($errmsg);
}
 
 
 
 
// ESCAPING A DATA FIELD FOR USE IN MYSQL QUERIES
// MAN PAGE: http://us2.php.net/manual/en/function.mysql-real-escape-string.php
// CREATE AN ARRAY OF NAMES
$names[] = mysql_real_escape_string("Williams");
$names[] = mysql_real_escape_string("Paseur");
$names[] = mysql_real_escape_string("O'Reilly");
 
 
 
// MAKING AN INSERT QUERY, USING THE ESCAPED STRINGS AND TESTING THE RESULTS
foreach ($names as $name)
{
   $sql = "INSERT INTO my_table (name) VALUES (\"$name\")";
   $res = mysql_query($sql);
 
// IF mysql_query() RETURNS FALSE, GET THE ERROR REASONS
   if (!$res)
   {
      $errmsg = mysql_errno() . ' ' . mysql_error();
      echo "<br/>QUERY FAIL: ";
      echo "<br/>$sql <br/>";
      die($errmsg);
   }
// IF WE GET THIS FAR, THE INSERT QUERY SUCCEEDED
}
 
// GET THE AUTO_INCREMENT ID OF THE RECORD JUST INSERTED
// MAN PAGE: http://us2.php.net/manual/en/function.mysql-insert-id.php
$_key  = mysql_insert_id();
 
echo "<br/><br/>LAST KEY: $_key AND NAME WITH ESCAPE STRING INCLUDED: $name <br/><br/>\n";
 
 
 
 
// MAKING A SELECT QUERY AND TESTING THE RESULTS
$sql = "SELECT * FROM my_table";
$res = mysql_query($sql);
 
// IF mysql_query() RETURNS FALSE, GET THE ERROR REASONS
if (!$res)
{
   $errmsg = mysql_errno() . ' ' . mysql_error();
   echo "<br/>QUERY FAIL: ";
   echo "<br/>$sql <br/>";
   die($errmsg);
}
// IF WE GET THIS FAR, THE QUERY SUCCEEDED AND WE HAVE A RESOURCE-ID IN $res SO WE CAN NOW USE $res IN OTHER MYSQL FUNCTIONS
 
// ITERATE OVER THE RESULTS SET
while ($row = mysql_fetch_assoc($res))
{
   var_dump($row);
}
                                              
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by: cxrPosted on 2009-09-06 at 18:14:17ID: 25272249

If there are unwanted slashes in the database, I would fix it once and for all with UPDATE statements, not by using stripslashes() for every SELECT statement.

 

by: Ray_PaseurPosted on 2009-09-08 at 04:42:56ID: 25280775

@cxr:  Agreed.  It's the sort of thing that can get fixed in the background without too much load on the server.

An interesting "future-proofing" note.  In case you are testing for magic quotes with this function:
http://us.php.net/manual/en/function.get-magic-quotes-gpc.php

You might want to read this page, too:
http://us.php.net/manual/en/security.magicquotes.php

In my (limited) experience with PHP6, the get_magic_quotes_gpc() function is gone, so a script that relies on it will throw a fatal error.

 

by: cxrPosted on 2009-09-08 at 05:02:40ID: 25280923

Yes... to maintain bacwards compatibillity we might need to do something like this in the future:

function db_escape($val) {
  if(function_exists('get_magic_quotes_gpc') and get_magic_quotes_gpc()) 
    $val = stripslashes($val);
  return mysql_real_escape_string($val);
}
                                              
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by: Ray_PaseurPosted on 2009-09-08 at 05:19:11ID: 25281038

Yep, that looks right to me.  I think the data base connection needs to be in the var scope for the mysql_real_esacpe_string() to work.  Best regards, ~Ray

 

by: cxrPosted on 2009-09-08 at 05:42:53ID: 25281219

A connection to mysql must have been opened with mysql_connect(), but it does not need to be in the same scope.

I think it is a bit odd that they are removing get_magic_quotes_gpc() in PHP6, because that function is used to write more portable code. I usually try to write portable code, so that it can run on any PHP enabled server, regardless of the PHP version.

An alternative way would be to define get_magic_quotes_gpc()  if it does not exist, like this:

if(!function_exists('get_magic_quotes_gpc')) {
  function get_magic_quotes_gpc() {
    return false;
  }
}

                                              
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by: Ray_PaseurPosted on 2009-09-08 at 05:44:52ID: 25281235

"a bit odd" - yes, indeed.  Maybe it will resurface.  After all, if PHP can have a GOTO statement, it can surely have this function carried forward!

 

by: evibesmusicPosted on 2009-09-15 at 15:01:52ID: 31625180

Thank you all for the help.  I will read up on the documentation that followed this comment.  Sorry for the delay in response.  Good work.

20120131-EE-VQP-002

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