mysqli::real_connect
mysqli::real_query
mysqli
PHP Manual

# mysqli::real_escape_string

# mysqli_real_escape_string

(PHP 5)

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

### Beschreibung

Objektorientierter Stil

string mysqli::escape_string ( string `$escapestr` )
string mysqli::real_escape_string ( string `$escapestr` )

Prozeduraler Stil

string 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.

Achtung

# Security: the default character set

The character set must be set either at the server level, or with the API function mysqli_set_charset() for it to affect mysqli_real_escape_string(). See the concepts section on character sets for more information.

### Parameter-Liste

`link`

  Nur bei prozeduralem Aufruf: Ein von mysqli_connect() oder mysqli_init() zurückgegebenes Verbindungsobjekt.

`escapestr`

  The string to be escaped.

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

### Rückgabewerte

Returns an escaped string.

### Beispiele

Beispiel #1 mysqli::real_escape_string() example

Objektorientierter Stil

`<?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();
?>`

Prozeduraler Stil

`<?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);
?>`

Die obigen Bespiele erzeugen folgende Ausgabe:

    Error: 42000
    1 Row inserted.

### Anmerkungen

> Hinweis:

> 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().

### Siehe auch

- mysqli_set_charset() - Sets the default client character set
- mysqli_character_set_name() - Returns the default character set for the database connection

mysqli::real_connect
mysqli::real_query
mysqli
PHP Manual