prepared statement in php

To use prepared statements in PHP, you need to follow these steps:

Create a database connection using mysqli or PDO
Prepare the SQL statement with placeholders for the values you want to insert or select
Bind the values to the placeholders using the appropriate method (bind_param for mysqli or bindValue/bindParam for PDO)
Execute the prepared statement
Fetch the results if you are selecting data

Here's an example of how to use prepared statements with mysqli:


main.php
// create db connection
$conn = new mysqli($servername, $username, $password, $dbname);

// prepare statement
$stmt = $conn->prepare("SELECT * FROM users WHERE username = ?");

// bind parameter(s)
$username = "john";
$stmt->bind_param("s", $username);

// execute statement
$stmt->execute();

// store result
$result = $stmt->get_result();

// fetch data
while ($row = $result->fetch_assoc()) {
    echo $row['username'] . "<br>";
}

// close statement and connection
$stmt->close();
$conn->close();
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And here's an example of how to use prepared statements with PDO:


main.php
// create db connection
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);

// prepare statement
$stmt = $conn->prepare("SELECT * FROM users WHERE username = :username");

// bind parameter(s)
$username = "john";
$stmt->bindParam(":username", $username);

// execute statement
$stmt->execute();

// fetch data
while ($row = $stmt->fetch()) {
    echo $row['username'] . "<br>";
}

// close statement and connection
$stmt = null;
$conn = null;
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