Podręcznik PHP
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# mysqli_real_escape_string

(PHP 5)

mysqli_real_escape_string

(no version information, might be only in CVS)

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

## Opis

Procedural style:

string mysqli_real_escape_string ( mysqli link, string escapestr )

Object oriented style (both methods are equivalent):

class mysqli {
string escape_string ( string escapestr )
string real_escape_string ( 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.

## Parametry

`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`.

## Zwracane wartości

Returns an escaped string.

## Przykłady

Przykład 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();
?>`

Przykład 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);
?>`

Powyższy przykład wyświetli:

    Error: 42000
    1 Row inserted.

## Patrz także

mysqli_character_set_name()

Poprzedni | Spis treści | Następny
mysqli_real_connect | Początek rozdziału | mysqli_real_query