Creating and writing to files in PHP involves a few simple steps. Here's how you can create and write to a file:

php
<?php
$file_path = 'example.txt'; // Replace with the path to your file

// Open the file for writing (creates the file if it doesn't exist)
$file_handle = fopen($file_path, 'w');

if ($file_handle) {
    $content = "Hello, world!\n"; // Content to write to the file

    // Write content to the file
    fwrite($file_handle, $content);

    // Close the file handle
    fclose($file_handle);

    echo "File created and written successfully.";
} else {
    echo "Failed to create or open the file.";
}
?>

In this example, we use the `fopen()` function with mode `'w'` to open the file for writing. If the file doesn't exist, this will create a new file. If the file already exists, the existing content will be overwritten. If you want to append to the file instead of overwriting it, you can use mode `'a'`.

We then use the `fwrite()` function to write content to the file. The first argument is the file handle returned by `fopen()`, and the second argument is the content you want to write.

Finally, we close the file handle using the `fclose()` function to ensure that the file is properly saved and resources are released.

Remember to replace `'example.txt'` with the actual path and filename you want to create or write to. Also, ensure proper error handling and validation in real-world scenarios to handle cases where file operations might fail.

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