使用 php 写入文件时检查行是否受影响

Question

how can i check if a line was written to a file? I am trying something like this:

    if (fwrite($handle, $data) == FALSE) {
    echo "<script>
            alert('Not written');
        </script>";
    include ('index.html');
    }
    else{
    echo "<script>
            alert('Written');
        </script>";
            include ('index2.html');}
    fclose($handle);

but it still notifies me as written even if nothing was put in the file.

Answer 1

check your parameters first (as markus suggested).

Also check comparison operator. You should use === instead of == in if statement.

Answer 2

Try file_put_contents , it returns number of bytes written, or false on failure.

if (file_put_contents($filename, $data, FILE_APPEND) !== false) {
  // success
} else {
  // fail: function failure
}