Phpmysql_real_escape_string () function _ PHP Tutorial

Phpmysql_real_escape_string () function. Mysql tutorial _ real_escape_string () function escape special characters in strings used in SQL statements. The following characters are affected: if x00nrx1a succeeds, the function returns the special characters in the character strings used in the escape mysql tutorial _ real_escape_string () function to escape SQL statements.

The following characters are affected:

X00
N
R

'
"
X1a
If yes, the function returns the escaped string. If it fails, false is returned.

Syntax
Mysql_real_escape_string (string, connection) parameter description
String is required. Specifies the string to be escaped.
Connection is optional. MySQL connection is required. If not specified, use the previous connection.
Instance

Function opendatabase ($ host, $ user, $ pass ){
Try {
If ($ db = mysql_connect ($ host, $ user, $ pass )){
Return $ db;
} Else {
Throw new exception ("Sorry, cocould not connect to mysql .");
}
} Catch (exception $ e ){
Echo $ e-> getmessage ();
}
}

Function selectdb ($ whichdb, $ db ){
Try {
If (! Mysql_select_db ($ whichdb, $ db )){
Throw new exception ("Sorry, database cocould not be opened .");
}
} Catch (exception $ e ){
Echo $ e-> getmessage ();
}
}
Function closedatabase ($ db ){
Mysql_close ($ db );
}
$ Db = opendatabase ("localhost", "root ","");
Selectdb ("mydatabase", $ db );
$ _ POST ['user'] = "myname ";
$ _ POST ['pass'] = "mypassword ";

Function validatelogin ($ user, $ pass ){
Mysql_real_escape_string ($ user );
Mysql_real_escape_string ($ pass );
$ Thequery = "SELECT * FROM userlogin WHERE username = '$ user' AND password =' $ pass '";
If ($ aquery = mysql_query ($ thequery )){
If (mysql_num_rows ($ aquery)> 0 ){
Return true;
} Else {
Return false;
}
} Else {
Echo mysql_error ();
}
}

If (validatelogin ($ _ POST ['user'], $ _ POST ['pass']) {
Echo "You have successfully logged in .";
} Else {
Echo "Sorry, you have an incorrect username and/or password .";
}

Closedatabase ($ db );

?>

The Escape () function escapes special characters in strings used in SQL statements. The following characters are affected: if x00 n r'x1a succeeds, the function returns the escaped...