PHP file_put_contents() Guide

The file_put_contents() function is used to write a string into a file. Its basic usage is:

file_put_contents($filename, $data);

In this case, $filename refers to the path of the file to be written, and $data refers to the string data to be written.

The file_put_contents() function returns the number of bytes written to the file, or false if the writing fails.

Example usage:

$data = "Hello, world!";
$filename = "file.txt";
$result = file_put_contents($filename, $data);

if($result !== false) {
    echo "写入成功，共写入 " . $result . " 字节数据。";
} else {
    echo "写入失败。";
}

In the example above, the string data “Hello, world!” is written to a file named file.txt and the number of bytes written is displayed.