PHP Dokumentation: Mysqli real-escape-string
12. Januar 2010 von werner
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 a SQL statement, taking into account the current charset of the connection
Beschreibung
Object oriented style (both methods are equivalent):
Procedural style:
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.
Parameter-Liste
- link
Nur bei prozeduralem Aufruf: Ein vonmysqli_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 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();
?>Beispiel #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);
?>Das oben gezeigte Beispiel erzeugt folgendeAusgabe:
Error: 420001 Row inserted.
Siehe auch
- mysqli_character_set_name() – Returns the default character set for the database connection
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