Cannot Write to a file in PHP

Question

I am trying to write a simple text into a php file. The snap of the code is below:

$a =  $_GET["option"];
$a = (string)$a;
$b = $_GET["ip_address"];
$myfile = fopen("newfile.txt", "w");
fwrite($myfile,$a);
fwrite($myfile,$b);
echo $a;
echo $b;

When I open the file through the terminal , its empty. however the echo commands in the php code display output as expected.

Should the file retain the content after the program has finished execution ? I am using syntax from here

EDIT: The new file is created by PHP however it does not have write permissions. I changed it. It works now

Answer 1

$a =  $_GET["option"];
$a = (string)$a;
$b = $_GET["ip_address"];
$myfile = fopen("newfile.txt", "w");
fwrite($myfile,$a);
fwrite($myfile,$b);
fclose($myfile);
echo $a;
echo $b;

try this once, as you were not closing the connection, thus the output was not getting stored

Answer 2

use fclose($myfile); to close the file and check the permission of the file/folder in which you are writing.

Answer 3

you should must be close the connection. please read this manual fclose manual

$myfile = fopen("newfile.txt", "w");
fwrite($myfile,"some text");
fwrite($myfile,"another text");
fclose($myfile);
echo $a;
echo $b;

Answer 4

Although the other answers saying you must use fclose do solve your problem, this is incidental. The actual issue is when you use fwrite the output is buffered - it's stored in memory but not yet committed to the filesystem. In order to commit this output to your file you should use fflush($myfile) ( fflush documentation ); you can do this multiple times before closing your file handle. Do bear in mind you should always close file handles with fclose to ensure resources are cleaned up correctly.