What are common errors to watch out for when writing PHP code that interacts with files and databases?

One common error to watch out for when writing PHP code that interacts with files and databases is not properly handling errors that may occur during file or database operations. It is essential to implement error handling mechanisms to catch and handle any potential issues that may arise, such as file not found errors or database connection failures. This ensures that your code can gracefully handle errors and provide meaningful feedback to users. 

// Example of implementing error handling for file operations
$file = 'example.txt';

if (file_exists($file)) {
    $content = file_get_contents($file);
    if ($content === false) {
        echo 'Error reading file.';
    } else {
        echo $content;
    }
} else {
    echo 'File not found.';
}

Keywords

SQL injection file permissions fopen mysqli_connect error handling

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