Mysqli statement returning warnings [duplicate] - php

Question

This question already has an answer here:
mysqli_real_escape_string() expects exactly 2 parameters, 1 given Fatal Error [duplicate]
(1 answer)
Closed 6 years ago.
Here is my code:
include "db_conx.php";
$sql = mysqli_query("INSERT INTO table(column) VALUES('" . mysqli_real_escape_string($var) . "')");
if ($sql) {echo "connection successful";
} else {
echo "failure";
}
It returns these errors:
Warning: mysqli_real_escape_string() expects exactly 2 parameters, 1 given
Warning: mysqli_query() expects at least 2 parameters, 1 given
I tried using PDO but that didn't work either...

Answer 1

First Parameter is mysql connection link identifier, and second is string For more details, you can visit this link : http://in2.php.net/manual/en/mysqli.real-escape-string.php.
include "db_conx.php";
$sql = mysqli_query(pass_your_connection_identifier_here ,"INSERT INTO table(column) VALUES('" . mysqli_real_escape_string(pass_your_connection_identifier_here, $var) . "')");
if ($sql) {echo "connection successful";
} else {
echo "failure";
}

Answer 2

You are missing connection identifier in both mysqli_real_escape_string() and mysqli_query()
change your code to mysqli_query($connection,$sql) and mysqli_real_escape_string($connection,$string)

Answer 3

You are missing connection variable at both the lines that's why you are facing issues :
Try to replace your code with this :
//$con // it is your connection variable
include "db_conx.php";
$sql = mysqli_query($con,"INSERT INTO table(column) VALUES('" . mysqli_real_escape_string($con,$var) . "')");
if ($sql) {echo "connection successful";
} else {
echo "failure";
}