What are the consequences of not separating different programming languages and technologies when working on a project in PHP?

Mixing different programming languages and technologies in a PHP project can lead to confusion, compatibility issues, and potential security vulnerabilities. It is important to separate concerns and use appropriate tools and libraries for each specific task to maintain code clarity and efficiency. 

// Example of separating concerns by using a separate file for database connection

// db.php
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
?>

// index.php
<?php
include 'db.php';

$sql = "SELECT * FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 results";
}
$conn->close();
?>

Keywords

JavaScript SQL injection security vulnerabilities cross-site scripting code readability

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