MySQLi
PHP Manual

mysqli::real_escape_string

mysqli::escape_string

mysqli_real_escape_string

(PHP 5, PHP 7)

mysqli::real_escape_string -- mysqli::escape_string -- mysqli_real_escape_stringEscapes special characters in a string for use in an SQL statement, taking into account the current charset of the connection

说明

面向对象风格

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

过程化风格

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.

Caution

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.

参数

link

仅以过程化样式:由mysqli_connect()mysqli_init() 返回的链接标识。

escapestr

The string to be escaped.

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

返回值

Returns an escaped string.

错误/异常

Executing this function without a valid MySQLi connection passed in will return NULL and emit E_WARNING level errors.

范例

Example #1 mysqli::real_escape_string() example

面向对象风格

<?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();
?>

过程化风格

<?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);
?>

以上例程会输出:

Error: 42000
1 Row inserted.

注释

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().

参见


MySQLi
PHP Manual