How can different types of quotation marks affect the execution of SQL queries in PHP?

Different types of quotation marks can affect the execution of SQL queries in PHP because using the wrong type of quotation marks can lead to syntax errors or vulnerabilities like SQL injection. To solve this issue, it is recommended to use prepared statements with placeholders instead of directly concatenating variables into the SQL query string. Prepared statements automatically handle the correct escaping and quoting of values, making the query safe and secure. 

// Using prepared statements to execute SQL queries safely
$pdo = new PDO("mysql:host=localhost;dbname=myDB", "username", "password");

// Example SQL query with placeholders
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->execute(['username' => $username]);

// Fetching results
$results = $stmt->fetchAll();

Keywords

PHP SQL queries quotation marks execution syntax errors

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