Example of php detecting file read-only, writable, and executable permissions

 $myfile = "./test.txt";
 if (is_readable ($myfile)) {
 echo "This file Readable. ", "n";
 } else {
 echo "This file is not readable.", "/n";
 }

 if (is_writable ($myfile)) {
 echo "This file is writable." , "/n";
 } else {
 echo "This file is not writable.", "/n";
 }
 if (is_executable ($myfile)) {
 echo "This File is executable!", "n";
 } else {
 echo "This file does not have executable permissions", "n";
 }
?>

Attached, detect the size of the file and learn how to use filesize.

 $myfile = "./test.txt";
 if (file_exists ($myfile)) {
 $checksize= filesize ($myfile);
 echo "$checksize";
 } else {
 echo "File does not exist!";
 }
?>