I Have this headache with PHP and MySQL - php

Question

I have this problem:
function search_by_name($mysql, $name, $lastname)
{
$query = 'SELECT idKlienci FROM Klienci WHERE Imie = "' . $name . '"
AND Nazwisko = "' . $lastnem . '"';
$result = $mysql->query($query);
$row = mysqli_fetch_array($result); // I want to get the ID' of table `Klienci1`
// and here i don't know how many dimentions have this array
echo $row[0][0]; // prints nothing
}

Answer 1

$lastnem != $lastname
So change the query to use the correct variable name
$query = 'SELECT idKlienci
FROM Klienci
WHERE Imie = "' . $name . '"
AND Nazwisko = "' . $lastname . '"';
To make this kind of code easier to read you can also make use of the fact that variables in a double quoted string are automatically expanded. Which make this easier to read and therefore debug.
$query = "SELECT idKlienci
FROM Klienci
WHERE Imie = '$name'
AND Nazwisko = '$lastname'";
$result = $mysql->query($query);
// use mysqli_fetch_assoc() then you get only one assoc array
// so you can use named parameters to the array.
// the names will match the column names in the table
//$row = mysqli_fetch_array($result);
// also mysqli_fetch_assoc() only returns one row at a time
$row = mysqli_fetch_assoc($result);
// a row is always one dimensional so do
echo $row['id'];
So if you have more than one row in the resultset of your query you have to get the results in a loop
$result = $mysql->query($query);
while ( $row = mysqli_fetch_assoc($result)) {
echo $row['id'] . '<br>';
}
Now you should see both rows

Answer 2

MYSQL doesn't use double quotes for strings, it uses simple quotes:
$query = "SELECT idKlienci FROM Klienci WHERE Imie = '$name' AND Nazwisko = '$lastname'";
You can also add the variable directly into PHP strings when you're using double quotes, without the need to concatenate them.

Answer 3

Your Argument name $lastname & used variable $lastnem name are not same.

Answer 4

try this :
$row = mysqli_fetch_array($result);
echo $row[0];