If you need help with PHP assignment? Look no further! At programminghomeworkhelp.com, we specialize in providing expert guidance and solutions for PHP assignments. In this post, we delve into two master-level PHP questions, offering comprehensive solutions to help you grasp complex concepts and excel in your assignments.

Question 1: Understanding Object-Oriented Programming in PHP

You've been tasked with creating a PHP class to represent a banking account. The class should have properties for the account holder's name, account number, and balance. Implement methods to deposit funds, withdraw funds, and display the account details. Ensure that appropriate validation is performed for withdrawals to prevent overdrawing.

Solution 1:

```php
class BankAccount {
    private $holderName;
    private $accountNumber;
    private $balance;

    public function __construct($holderName, $accountNumber, $initialBalance) {
        $this-holderName = $holderName;
        $this-accountNumber = $accountNumber;
        $this-balance = $initialBalance;
    }

    public function deposit($amount) {
        if ($amount  0) {
            $this-balance += $amount;
            echo "Deposit of $amount successful. New balance: $this-balance";
        } else {
            echo "Invalid deposit amount";
        }
    }

    public function withdraw($amount) {
        if ($amount  0  $amount = $this-balance) {
            $this-balance -= $amount;
            echo "Withdrawal of $amount successful. New balance: $this-balance";
        } else {
            echo "Insufficient funds or invalid withdrawal amount";
        }
    }

    public function displayAccountDetails() {
        echo "Account Holder: $this-holderName\";
        echo "Account Number: $this-accountNumber\";
        echo "Balance: $this-balance\";
    }
}

// Usage
$account = new BankAccount("John Doe", "123456789", 1000);
$account-deposit(500);
$account-withdraw(200);
$account-displayAccountDetails();
```

Question 2: Implementing a File Upload System with PHP

You're building a file upload system where users can upload images. Create a PHP script that handles file uploads securely. Ensure that only image files (JPEG, PNG, GIF) are accepted, and implement proper file validation and error handling to prevent malicious file uploads.

Solution 2:

```php
?php
$targetDir = "uploads/";
$allowedTypes = array('image/jpeg', 'image/png', 'image/gif');

if ($_SERVER["REQUEST_METHOD"] == "POST"  isset($_FILES["file"])) {
    $fileName = basename($_FILES["file"]["name"]);
    $targetPath = $targetDir . $fileName;
    $fileType = $_FILES["file"]["type"];

    if (in_array($fileType, $allowedTypes)) {
        if (move_uploaded_file($_FILES["file"]["tmp_name"], $targetPath)) {
            echo "File uploaded successfully.";
        } else {
            echo "Error uploading file.";
        }
    } else {
        echo "Invalid file type. Only JPEG, PNG, and GIF files are allowed.";
    }
}
?

form action="?php echo $_SERVER["PHP_SELF"]; ?" method="post" enctype="multipart/form-data"
    Select image to upload:
    input type="file" name="file" id="file"
    input type="submit" value="Upload Image" name="submit"
/form
```

Conclusion

Mastering PHP requires a deep understanding of its concepts and practical application. By tackling complex assignments like those presented here, you'll sharpen your skills and become proficient in PHP development. If you need further assistance or want to explore more PHP assignments, don't hesitate to reach out to us at programminghomeworkhelp.com. Our team of experts is here to guide you every step of the way. Happy coding!