Error when I passed on values on function - php

Question

Sorry about the last post I had. Here's my revision, please help me.
<?php
//connect database
$sql = "SELECT * FROM user where user_id = 8320 AND password = 'admin' ";
$query = pg_query($sql);
var_dump($row = pg_fetch_array($query)); //dumps correctly.
?>
BUT THE PROBLEM IS THIS..when I try to make it as a function LIKE:
function check($user_id, $password)
{
$sql = "SELECT * FROM user where user_id = $user_id AND password = '$password' ";
$query = pg_query($sql);
$row = pg_fetch_array($query);
return $row;
}
AND CALL IT HERE:
var_dump($data = check(8320, 'admin')); DUMPS NULL;
How come it ended up like this?

Answer 1

Its returning NULL because there is an error with your SQL query, and no results are being returned. You should do some error checking in your function, try this version:
function check($user_id, $password)
{
$dbconn = pg_connect("host=localhost dbname=test");
$sql = "SELECT * FROM user where user_id = $1 AND password = $2 ";
$result = pg_query_params($dbconn, $sql, array($user_id,$password));
$row = pg_fetch_array($result);
if (!$row) {
echo pg_last_error($dbconn);
} else {
return $row;
}
}

Answer 2

Try the code below. It should work fine for you.
$data = check(8320, 'admin');
var_dump($data);

Answer 3

Seems like your PostgreSQL resource is missing inside the function. You have two options.
Declare the connection resource inside the function using global.
Establish the connection inside the function.
This is the first option:
$conn = pg_connect('host','user','pass','db');
function check($user_id, $password)
{
global $conn;
$sql = "SELECT * FROM user where user_id = $user_id AND password = '$password' ";
$query = pg_query($conn, $sql);
$row = pg_fetch_array($query);
return $row;
}
And this is the second option:
function check($user_id, $password)
{
$conn = pg_connect('host','user','pass','db');
$sql = "SELECT * FROM user where user_id = $user_id AND password = '$password' ";
$query = pg_query($conn, $sql);
$row = pg_fetch_array($query);
return $row;
}
According to the PHP manual, You may omit connection resource, but it is not recommended, since it can be the cause of hard to find bugs in scripts.