Help with function

[Trium918]

Problem: write a script that will only allow the

user to enter ,a-z A-Z 0-9, letters and numbers.

I have another script that I am using to validate

an email address and it's working using the same method.

Unfortunately, this one isn't working.

 

Note: Just Ideas

 

<?php
//clean out any SQL injections, but limited to numbers and letters only  
   if (!valid_entry($_POST['user_name']))
   {
      do_html_header("Problem:");
      echo "<p class=\"genmed\">That is not valid a user name.  Please go back "
           ." and try again.</p>";
      do_html_footer();
      exit; 
   }
?>

 

<?php
function valid_entry($user_name)
{
  if(ereg("/[^a-zA-Z0-9]/",$user_name))
  	return true;
  else
             return false;			
}
?>

[MadTechie]

<?php
function valid_entry($user_name)
{
  if(ereg("/[^a-zA-Z0-9]/",$user_name))
{
  	return true;
  }else{
             return false;
}
}
?>

[Trium918]

I got it working like this, but is it cool to

do it this way?

 

<?php
function valid_entry($user_name)
{
  if(ereg("^[a-zA-Z0-9]+$",$user_name))
  	return true;
  else
  	return false;			
}
?>

[genericnumber1]

why not...

 

<?php
function valid_entry($user_name)
{
  return ereg("^[a-zA-Z0-9]+$",$user_name);	
}
?>

 

but yes, you can do it like that, but most people use brackets to keep it easy to read

[Trium918]

why not...

 

<?php
function valid_entry($user_name)
{
  return ereg("^[a-zA-Z0-9]+$",$user_name);	
}
?>

 

but yes, you can do it like that, but most people use brackets to keep it easy to read

Thanks

 

Is it possible to set an array for every field that will

be using numbers and letters and place that variable

where $user_name is and would I have to have a loop?

[MadTechie]

it would be messy on the return as it will return an array of booleans

 

you can create a loop and just all the function

 

 

[Trium918]

I donnot want to have to create this for every

form field.

 

<?php
// clean out any SQL injections, but limited to numbers and letters only  
   if (!valid_entry($_POST['address']))
   {
   	  do_html_header("Problem:");
      echo "<p class=\"genmed\">That is not valid a user name.  Please go back "
           ." and try again.</p>";
      do_html_footer();
      exit; 
   }

// clean out any SQL injections, but limited to numbers and letters only  
   if (!valid_entry($_POST['lastname']))
   {
   	  do_html_header("Problem:");
      echo "<p class=\"genmed\">That is not valid a user name.  Please go back "
           ." and try again.</p>";
      do_html_footer();
      exit; 
   }

// clean out any SQL injections, but limited to numbers and letters only  
   if (!valid_entry($_POST['firstname']))
   {
   	  do_html_header("Problem:");
      echo "<p class=\"genmed\">That is not valid a user name.  Please go back "
           ." and try again.</p>";
      do_html_footer();
      exit; 
   }




?>

 

<?php
function valid_entry($user_name)
{
  if(ereg("^[a-zA-Z0-9]+$",$user_name))
  	return true;
  else
  	return false;			
}
?>

[MadTechie]

you could

 

<?php
foreach($_POST as $P)
{
   if (!valid_entry($P))
   {
   	  do_html_header("Problem:");
      echo "<p class=\"genmed\">That is not valid data.  Please go back "
           ." and try again.</p>";
      do_html_footer();
      exit; 
   }
}
?>

 

the address would fail

[Trium918]

you could

 

<?php
foreach($_POST as $P)
{
   if (!valid_entry($P))
   {
   	  do_html_header("Problem:");
      echo "<p class=\"genmed\">That is not valid data.  Please go back "
           ." and try again.</p>";
      do_html_footer();
      exit; 
   }
}
?>

 

the address would fail

 

I am getting the echo

[genericnumber1]

<?php
function valid_entry($entries)
{
   $valid = true;
   foreach((array)$entries as $entry)
   {
      if(!ereg("^[a-zA-Z0-9]+$", $entry))
      {
         $valid = false;
      }
   }
   return $valid;
}

$entries = array($_POST['username'], $_POST['password']);
if(!valid_entry($entries))
{
   echo 'Bad entry!';
}
?>

 

you could pass that function a string or an array.

[Trium918]

<?php
function valid_entry($entries)
{
   $valid = true;
   foreach((array)$entries as $entry)
   {
      if(!ereg("^[a-zA-Z0-9]+$", $entry))
      {
         $valid = false;
      }
   }
   return $valid;
}

$entries = array($_POST['username'], $_POST['password']);
if(!valid_entry($entries))
{
   echo 'Bad entry!';
}
?>

 

you could pass that function a string or an array.

 

It is giving me the echo 'bad entry'; even when

there is only letters and numbers.

[otuatail]

Sorry to be a snake in the grass, but been there got a t-shirt. What is a valid email address.

@aol.com @biz.co.uk endless ?

my atempt was it had to have one and only one @

only one dot after

and have 1 or more charecters before the @

emails I think have to start with a letter a - z

True email validation is very hard

[MadTechie]

for email you can try

 

<?php
if (eregi('\\A\\b[A-Z0-9._%-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}\\b\\z', $email))
{
echo "valid";
}
?>

 

this is untested