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public string PDO::quote ( string $string [, int $parameter_type = PDO::PARAM_STR ] )

<?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";
?>

Unquoted string: Nice
Quoted string: 'Nice'

<?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";
?>

Unquoted string: Naughty ' string
Quoted string: 'Naughty '' string'