即使文件不为空，fgets（）也会返回false

Question

I have a form from which I save the given input into a textfile,
but I have trouble reading from the saved file:

while(!feof($fileNotizen)) {
$rawLine = fgets($fileNotizen);
if($rawLine==false) {
  echo "An error occured while reading the file"; 
}

$rawLine seems to be always false, even though I use this function before, to fill the textfile:

function addToTable($notizFile) {
 fwrite($notizFile, $_POST["vorname"]." ".$_POST["nachname"]."#");
 $date = date(DATE_RFC850);
 fwrite($notizFile, $date."#");
 fwrite($notizFile, $_POST["notiz"].PHP_EOL);   
}

And after I submit the form and get the error message, if I check the textfile, everything is there, so the function works correctly.

If it is of value, I open the file with this command:

$fileNotizen = fopen("notizen.txt", "a+");

Could the problem be that the pointer is already at the end of the file and thus returns false?

Answer 1

$fileNotizen = fopen("notizen.txt", "a+");

a+ opens for read/write but places file pointer AT THE END. So you must fseek() to the beginning first or look into fopen() flags and choose more wisely based on your needs.

Use fseek($fileNotizen, 0, SEEK_SET); to rewind the file.