PHP pdo_quote function

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PDO->quote()

(no version information, might be only in CVS)

PDO->quote() places quotes around the input string (if
required) and escapes special characters within the input string, using a
quoting style appropriate to the underlying driver.

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 a 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.

The string to be quoted.

Provides a data type hint for drivers that have alternate quoting styles.
The default value is PDO::PARAM_STR.

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.

Example 1. Quoting a normal string

$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:

Example 2. Quoting a dangerous string

$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:

Example 3. Quoting a complex string

$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: