Problem in executing gpio shell via PHP

Question

I was trying to execute gpio[bash shell] command from PHP. I was executing properly as expected, but when I cross check the same with bash shell pin 0 values got changed. 1. input url :gpio.php?value=4 [working and output displayed as expected toggle happens] 2. bash shell : #gpio read 4 [doesn't change the value, only pin 0 changes]

$num = intval($_GET['value']);
echo $num;
if (isset($num)){
        $read = shell_exec('gpio read ".$num."');
        if($read == 0) {
                echo "OFF";
                $re = shell_exec('gpio write ".$num." 1');}
        if($read == 1) {
                echo "ON";
                $re = shell_exec('gpio write ".$num." 0');}

        $read = shell_exec('gpio read ".$num."');
        if($read == 0) {echo " --> OFF";}
        if($read == 1) {echo " --> ON";}
        }
else {echo "No value Found";}

Let me known were I'm wrong...?

Answer 1

My PHP is rusty (to say the least).

I would use

$cmd = "gpio write $num 1";
$re = shell_exec($cmd);

or possibly just

$re = shell_exec("gpio write $num 1");