PHP exec() 并显示输出

Question

I've already seen a lot of solutions online for my problem but I have to admit that most of them did not work for me. Either they did just not output anything or even broke the upload function in my program, which actually works fine. I have written a little Script for the RaspberryPi enabling people to upload a hex file via http and have it automatically compiled using avrdude. Maybe I'm just too stupid to figure it out.

<?php
$target_dir = "upload/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$all_ok = 1;

    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], "upload/upload.hex")) {
        echo "Die Datei ". basename( $_FILES["fileToUpload"]["name"]). " wurde hochgeladen."."<br>";
        $all_ok=1;
    } else {
        $all_ok == 0;
        echo "Sorry, während dem Upload ist ein Fehler aufgetreten!"."<br>";
    }
    
    if ($all_ok == 1){
        $result = exec("/usr/bin/avrdude -c gpio -p m328p /var/www/upload/upload.hex -Uflash:w:/var/www/upload/upload.hex 2>&1", $output, $return_var);
        $result_array=explode(' ',$result);
        echo "Output: ".$result_array."<br>";
        echo "Exit status: ".$return_var."<br>";
    } else {
        echo "Sorry, während dem Kompilieren ist ein Fehler aufgetreten!";
    }   
?>

This is the current version of my program which sadly doesn't display anything more then

Die Datei blink.hex wurde hochgeladen.

Output: Array

Exit status: 0

I think the problem is somewhere near

$result_array=explode(' ',$result);
        echo "Output: ".$result_array."<br>";

This was my latest vain approach, hopefully someone will enlighten me.

Answer 1

$all_ok == 0;

应该

$all_ok = 0;

Answer 2

exec()

exec( string $command [, array &$output [, int &$return_var ]] )

It means second parameter is your output array. So do not assign the exec to any variable just use

 exec("/usr/bin/avrdude -c gpio -p m328p /var/www/upload/upload.hex -Uflash:w:/var/www/upload/upload.hex 2>&1", $output, $return_var);

print_r($output);
 $result_array=explode(' ',$output);
        echo "Output: ".$result_array."<br>";
        echo "Exit status: ".$return_var."<br>";