pdo not reading string from mysql function - php

Question

I am using the following code for reading a String from a mysql function:
<?php
print_r($_POST);
try {
$dbh = new PDO("mysql:dbname=mydb;host=myhost", "myuser", "mypass" );
$value = $_POST['myLname'];
print $value ;
//print $dbh ;
$stmt = $dbh->prepare("CALL check_user_exists(?)");
$stmt->bindParam(1, $value, PDO::PARAM_STR | PDO::PARAM_INPUT_OUTPUT, 50);
// call the stored procedure
$stmt->execute();
print "procedure returned $value\n";
echo "PDO connection object created";
$dbh = null;
} catch(PDOException $e) {
echo $e->getMessage();
}
?>
This is not reading the returned value , however if I read the value usimg mysql* like :
<?php
$dbhost='myhost';
$dbuser='mydb';
$dbpassword='mypass';
$db='mydb';
$con=mysql_connect($dbhost, $dbuser, $dbpassword) or die("Could not connect: " . mysql_error()); ;
mysql_select_db($db,$con);
$qry_str = "select check_user_exists('chadhass#hotmail.com')";
$rset = mysql_query($qry_str) or exit(mysql_error());
$row = mysql_fetch_assoc($rset);
mysql_close($con);
foreach($row as $k=>$v)
{
print $k.'=>'.$v;
}
?>
This returns correctly . ANy idea wha am I missing ?
function :
CREATE
FUNCTION `check_user_exists`(in_email
VARCHAR(100)) RETURNS varchar(1) CHARSET utf8
READS SQL DATA
BEGIN
DECLARE vcount INT;
DECLARE vcount1 INT;
SELECT COUNT(*) INTO vcount FROM USERS
WHERE USEREMAIL=in_email;
IF vcount=1 then
SELECT COUNT(*) INTO vcount1 FROM USERS
WHERE USEREMAIL=in_email and isactive=1;
if vcount1=1 then
return('1');
else
return('0');
end if;
ELSE
RETURN('2');
END IF;
END
code that worked for PDO ::
<?php
//print_r($_POST);
try {
$dbh = new PDO(PDO("mysql:dbname=mydb;host=myhost", "myuser", "mypass" );
$value = $_POST['myLname'];
$result = $dbh->prepare("select check_user_exists(?) as retval");
$result->bindParam(1, $value, PDO::PARAM_STR, 2);
$result->setFetchMode(PDO::FETCH_CLASS, 'stdClass');
$result->execute();
$obj = $result->fetch();
print($obj->retval);
echo "PDO connection object created";
$dbh = null;
}
catch(PDOException $e)
{
echo $e->getMessage();
}
?>

Answer 1

The reason is, you aren't fetching the results from the query.
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);