<?php

// 6. file_put_contents()

$result = file_put_contents("testfile.txt", "Hello again, world!");

if ($result !== false) {

    echo "Data written successfully.\n";

} else {

    echo "Failed to write to file.\n";

}

// Output:

// Data written successfully.

​

// 7. file_exists()

if (file_exists("testfile.txt")) {

    echo "File exists.\n";

} else {

    echo "File does not exist.\n";

}

// Output:

// File exists.

​

// 8. unlink()

if (unlink("testfile.txt")) {

    echo "File deleted successfully.\n";

} else {

    echo "Failed to delete file.\n";

}

// Output:

// File deleted successfully.

​

// 9. rename()

$file = fopen("oldfile.txt", "w");

fclose($file);

if (rename("oldfile.txt", "newfile.txt")) {

    echo "File renamed successfully.\n";

} else {

    echo "Failed to rename file.\n";

}

// Output:

// File renamed successfully.

​

// 10. copy()

$file = fopen("sourcefile.txt", "w");

fclose($file);

if (copy("sourcefile.txt", "destinationfile.txt")) {

    echo "File copied successfully.\n";

} else {

    echo "Failed to copy file.\n";

}

// Output:

// File copied successfully.

?>

​