What are the potential pitfalls of using eval() in PHP code?

Using eval() in PHP code can introduce security vulnerabilities as it allows for the execution of arbitrary code, opening the door for potential injection attacks. To avoid these pitfalls, it is recommended to find alternative solutions such as using built-in PHP functions or creating dynamic code execution in a safer manner.

// Avoid using eval() to execute dynamic code
$code = "echo 'Hello, World!';";
eval($code); // This is not recommended

// Use alternative solutions such as built-in PHP functions
$code = "echo 'Hello, World!';";
echo $code; // This is a safer alternative to eval()