PHP

mysqli real escape string php

<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = mysqli_connect("localhost", "my_user", "my_password", "world");

$city = "'s-Hertogenbosch";

/* this query with escaped $city will work */
$query = sprintf("SELECT CountryCode FROM City WHERE name='%s'",
    mysqli_real_escape_string($mysqli, $city));
$resu = mysqli_query($mysqli, $query);
printf("Select returned %d rows.
", mysqli_num_rows($result));

/* this query will fail, because we didn't escape $city */
$query = sprintf("SELECT CountryCode FROM City WHERE name='%s'", $city);
$result = mysqli_query($mysqli, $query);

real escape string mysqli

$firstname = mysqli_real_escape_string($con, $_POST['firstname']);

mysqli_escape_string

$conn->real_escape_string($var);

mysqli real escape string

$escape = mysqli_real_escape_string($connection, $lastname);