What are the implications of using eval() in PHP code, and what alternatives should be considered?

Using eval() in PHP code can introduce security vulnerabilities as it allows for the execution of arbitrary code. It is generally recommended to avoid using eval() whenever possible and instead opt for safer alternatives such as using built-in functions or libraries to achieve the desired functionality. 

// Example of using eval()
$code = 'echo "Hello, World!";';
eval($code);
```

```php
// Safer alternative to eval() using a switch statement
$code = 'hello';
switch ($code) {
    case 'hello':
        echo "Hello, World!";
        break;
    default:
        // Handle other cases
        break;
}

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