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PDO->quote()

Quotes a string for use in a query. ()

PDO {
  string quote(string string,
               int parameter_type);

}

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.

Parameters

string

The string to be quoted.

parameter_type

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

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 1766. 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 1767. 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 1768. 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'