PDO::quote
(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.2.1)
PDO::quote —
Quotes a string for use in a query
Description
If you are using this function to build SQL statements, you are
strongly recommended to use
PDO::prepare() to prepare SQL statements with bound
parameters instead of using PDO::quote() to interpolate
user input into an SQL statement. Prepared statements with bound parameters
are not only more portable, more convenient, immune to SQL injection, but
are often much faster to execute than interpolated queries, as both the
server and client side can cache a compiled form of the query.
Not all PDO drivers implement this method (notably PDO_ODBC). Consider
using prepared statements instead.
Caution
Security: the default character set
The character set must be set either on the server level, or within the
database connection itself (depending on the driver) for it to affect
PDO::quote(). See the driver-specific
documentation for more information.
Parameters
string-
The string to be quoted.
type-
Provides a hint as to the type of data for drivers that have alternate quoting
styles. For example PDO_PARAM_LOB will tell the driver to
escape binary data.
Return Values
Returns a quoted string that is theoretically safe to pass into an
SQL statement. Returns false if the driver does not support quoting in
this way.
Examples
Example #1 Quoting a normal string
<?php
$conn = new PDO('sqlite:/home/lynn/music.sql3');
/* Simple string */
$string = 'Nice';
print "Unquoted string: $string\n";
print "Quoted string: " . $conn->quote($string) . "\n";
?>
The above example will output:
Unquoted string: Nice
Quoted string: 'Nice'
Example #2 Quoting a dangerous string
<?php
$conn = new PDO('sqlite:/home/lynn/music.sql3');
/* Dangerous string */
$string = 'Naughty \' string';
print "Unquoted string: $string\n";
print "Quoted string:" . $conn->quote($string) . "\n";
?>
The above example will output:
Unquoted string: Naughty ' string
Quoted string: 'Naughty '' string'
Example #3 Quoting a complex string
<?php
$conn = new PDO('sqlite:/home/lynn/music.sql3');
/* Complex string */
$string = "Co'mpl''ex \"st'\"ring";
print "Unquoted string: $string\n";
print "Quoted string: " . $conn->quote($string) . "\n";
?>
The above example will output:
Unquoted string: Co'mpl''ex "st'"ring
Quoted string: 'Co''mpl''''ex "st''"ring'
PDO::query
PDO