PHP Reference

Description

Procedural style:

string mysqli_real_escape_string ( object link, string escapestr)

Object oriented style (method):

class mysqli {

string real_escape_sring ( string escapestr)

}

This function is used to create a legal SQL string that you can use in a SQL statement. The string escapestr is encoded to an escaped SQL string, taking into account the current character set of the connection.

Characters encoded are NUL (ASCII 0), \n, \r, \, ', ", and Control-Z.

Example

Example 1. Object oriented style


<?php

$mysqli = new mysqli("localhost", "my_user", "my_password", "world");



/* check connection */

if (mysqli_connect_errno()) {

    printf("Connect failed: %s\n", mysqli_connect_error());

    exit();

}



$mysqli->query("CREATE TEMPORARY TABLE myCity LIKE City");



$city = "'s Hertogenbosch";



/* this query will fail, cause we didn't escape $city */

if (!$mysqli->query("INSERT into myCity (Name) VALUES ('$city')")) {

    printf("Error: %s\n", $mysqli->sqlstate);

}



$city = $mysqli->real_escape_string($city);



/* this query with escaped $city will work */

if ($mysqli->query("INSERT into myCity (Name) VALUES ('$city')")) {

    printf("%d Row inserted.\n", $mysqli->affected_rows);

} 



$mysqli->close();

?>

Example 2. Procedural style


<?php

$link = mysqli_connect("localhost", "my_user", "my_password", "world");



/* check connection */

if (mysqli_connect_errno()) {

    printf("Connect failed: %s\n", mysqli_connect_error());

    exit();

}



mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City");



$city = "'s Hertogenbosch";



/* this query will fail, cause we didn't escape $city */

if (!mysqli_query($link, "INSERT into myCity (Name) VALUES ('$city')")) {

    printf("Error: %s\n", mysqli_sqlstate($link));

}



$city = mysqli_real_escape_string($link, $city);



/* this query with escaped $city will work */

if (mysqli_query($link, "INSERT into myCity (Name) VALUES ('$city')")) {

    printf("%d Row inserted.\n", mysqli_affected_rows($link));

} 



mysqli_close($link);

?>

The above examples would produce the following output:

Error: 42000
1 Row inserted.

mysqli_real_escape_string

Description

Return values

See also

Example