详解PHP中的PDO::quote(附代码实例）

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

<?php
$servername = "localhost";
$username = "root";
$password = "root123456";
$dbname   = "my_database";
 
try {
    $pdo = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    echo "连接成功"."<br>"; 
    // $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $pdo->setAttribute(PDO::ATTR_CASE, PDO::CASE_UPPER);

    $string = 'Nice';
    print "Unquoted string: $string";
    echo "<br>";
    print "Quoted string: " . $pdo->quote($string) . "\n";
}catch(PDOException $e){
    echo $e->getMessage();
}

输出：连接成功
    Unquoted string: Nice
    Quoted string: 'Nice'

<?php
$servername = "localhost";
$username = "root";
$password = "root123456";
$dbname   = "my_database";
 
try {
    $pdo = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    echo "连接成功"."<br>"; 
    // $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $pdo->setAttribute(PDO::ATTR_CASE, PDO::CASE_UPPER);
    $string = 'Naughty \' string';
    print "Unquoted string: $string";
    echo "<br>";
    print "Quoted string:" . $pdo->quote($string);
    }

输出：连接成功
Unquoted string: Naughty ' string
Quoted string:'Naughty \' string'