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 a SQL statement, taking into account the current charset of the connection

### 설명

Object oriented style (both methods are equivalent):

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

Procedural style:

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.

### 인수

`link`

  순차 형식 전용: mysqli_connect()나 mysqli_init()가 반환한 연결 식별자.

`escapestr`

  The string to be escaped.

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

### 반환값

Returns an escaped string.

### 예제

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);
?>`

위 예제의 출력:

    Error: 42000
    1 Row inserted.

### 참고

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

mysqli::real_connect
mysqli::real_query
MySQLi
PHP Manual