php man page for mysqli_real_escape_string

MYSQLI_REAL_ESCAPE_STRING(3)						 1					      MYSQLI_REAL_ESCAPE_STRING(3)

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

       Object oriented style

SYNOPSIS
       string mysqli::escape_string (string  $escapestr)

DESCRIPTION
       string mysqli::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.

       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(3) for it to affect
	      mysqli_real_escape_string(3). See the concepts section on character sets for more information.

PARAMETERS
	      o $
		link -Procedural style only: A link identifier returned by mysqli_connect(3) or mysqli_init(3)

	      o $escapestr
		- The string to be escaped.  Characters encoded are NUL (ASCII 0), 
, 
, , ', ", and Control-Z.

RETURN VALUES
	Returns an escaped string.

EXAMPLES
       Example #1

	      mysqli::real_escape_string example

	      Object oriented style

	      <?php
	      $mysqli = new mysqli("localhost", "my_user", "my_password", "world");

	      /* check connection */
	      if (mysqli_connect_errno()) {
		  printf("Connect failed: %s
", 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
", $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.
", $mysqli->affected_rows);
	      }

	      $mysqli->close();
	      ?>

	      Procedural style

	      <?php
	      $link = mysqli_connect("localhost", "my_user", "my_password", "world");

	      /* check connection */
	      if (mysqli_connect_errno()) {
		  printf("Connect failed: %s
", 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 ('$city')")) {
		  printf("Error: %s
", mysqli_sqlstate($link));
	      }

	      $city = mysqli_real_escape_string($link, $city);

	      /* this query with escaped $city will work */
	      if (mysqli_query($link, "INSERT into myCity (Name) VALUES ('$city')")) {
		  printf("%d Row inserted.
", mysqli_affected_rows($link));
	      }

	      mysqli_close($link);
	      ?>

	      The above examples will output:

	      Error: 42000
	      1 Row inserted.

NOTES
       Note

	       For those accustomed to using mysql_real_escape_string(3), note that the arguments of mysqli_real_escape_string(3) differ from what
	      mysql_real_escape_string(3)  expects.  The  $link  identifier  comes first in mysqli_real_escape_string(3), whereas the string to be
	      escaped comes first in mysql_real_escape_string(3).

SEE ALSO
       mysqli_set_charset(3), mysqli_character_set_name(3).

PHP Documentation Group 											      MYSQLI_REAL_ESCAPE_STRING(3)