mysqli::real_escape_string, mysqli_real_escape_string

• mysqli::real_escape_string

  mysqli_real_escape_string

  Escapes special characters in a string for use in an SQL statement, taking into account the current charset of the connection

Description

Object oriented stylestring mysqli::escape_string(string escapestr);
string mysqli::real_escape_string(string escapestr);

Procedural stylestring mysqli_real_escape_string(mysqli link,
string escapestr);

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

Parameters

link

Procedural style only: A link identifier returned by mysqli_connect or mysqli_init

escapestr

The string to be escaped.

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

Return Values

Returns an escaped string.

Examples

Example 20.132. mysqli::real_escape_string example

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();
?>

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 will output:

Error: 42000
1 Row inserted.

Notes

Note

For those accustomed to using mysql_real_escape_string, note that the arguments of mysqli_real_escape_string differ from what mysql_real_escape_string expects. The link identifier comes first in mysqli_real_escape_string, whereas the string to be escaped comes first in mysql_real_escape_string.

See Also

mysqli_character_set_name

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