PHP file-writing problems - php

Question

I have a file called "number.txt"(there is a number inside, e.g.: 0 )
And I want to read the number inside the number.txt and use fwrite to write the number plus 1
(number+1), so that each time anyone visit this webpage, the number will add 1.
but when i test it, it only works at first time(now number.txt is 1).
Then i try another time, the fread function read 0 but not 1.
<?php
$fgc = file_get_contents('number.txt');
settype($cont, "integer");
$cont = $cont + 1;
settype($cont, "string");
file_put_contents('number.txt', $cont);
$str = settype($cont, "string");
$fp = fopen( $str ,'w+');
if($fp==false) {
$str = $str + 1;
$fp = fopen( $str ,'w+');
}
if($fp==false) {
$str = $str + 1;
$fp = fopen( $str ,'w+');
}
if($fp==false) {
$str = $str + 1;
$fp = fopen( $str ,'w+');
}
if($fp==false) {
$str = $str + 1;
$fp = fopen( $str ,'w+');
}
$da = $_GET['data'];
fwrite($fp, $da);
fclose($fp);
?>

Answer 1

And why not to do simple like this:
file_put_contents('numbers.txt', is_writeable('numbers.txt')?((int)file_get_contents('numbers.txt'))+1:exit('Failed to open file'));

Answer 2

Borrowing on Eugene's great one-liner, came up with the following solution.
(Credit goes to go Eugene)
The following code will create the file if it does not exist, and increment by +1 each time it is reloaded.
(Tested)
<?php
$filename = "number.txt";
$filename = fopen($filename, 'a') or die("can't open file");
file_put_contents('number.txt', ((int)file_get_contents('number.txt'))+1);
// To show (echo) the contents of the file, you can use one of the following
// include("number.txt");
// echo file_get_contents('number.txt');
?>

Answer 3

It is because you are setting the write data to the old GET var and not the new set var.
fwrite($fp, $da);
Try using
fwrite($fp, $str);
And also you only need to fopen() once.

Answer 4

$filename = 'number.txt';
$content = (int) file_get_contents($filename);
$content++;
var_dump($content);
file_put_contents($filename, $content);
You have to create that file number.txt and insert there 0 as file content, then your script should work every time.

Answer 5

You are reading the contents into the variable $fgc, but you're trying to use $cont to represent that value, which is uninitialized. So your settype call is going to cast that to 0. Instead, try:
$fgc = file_get_contents('number.txt');
settype($fgc, "integer");