Php script loading forever not showing output

Question

Well i was trying to figure out where is the problem all day long now,
i wrote some php code to embed text in given image. I put evry 3 letters in each pixel by using its ASCII value as rgb values. My problem is that when i launch the script it keeps loading forver. I guess i have some problems with my code but i can't figure it out, the debugger didn't help very much as well.
Here is my code:

<?php

$img = imagecreatefromjpeg ("https://dataencrypt.xyz/testimage.jpg"); 

$data = "abcdefghi"; //example

if($q=strlen($data)%3!=0){

    $q==1?$data.="--":$data.="-";

}

if($img!=false){

    for($i = 0;$i<(strlen($data)-3);$i+3){

        $part = substr ($data , $i,3  );

        $color = getEncryptedColor($img,$part);

        imagesetpixel($img, $i,$i, $color);

    }

}

 $decrypted = decryptDataFromImage($img,0,0); // get the first 3 letters.

 echo "".$decrypted;

imagedestroy($img);



function getEncryptedColor($img,$string){

    return imagecolorallocate($img, ord($string[0]), ord($string[1]), ord($string[2]));

}

function printImageValues($image,$num){

    for($x = 0;$x<$num;$x++){

        echo "\n".imagecolorat($image, $x, $x);

    }

    echo "--END--";

}

function decryptDataFromImage($img,$x,$y){

    $currpixel = imagecolorat($img, $x, $y);

    $colors = imagecolorsforindex($img, $currpixel);

    $str = "".chr($colors["red"]).chr($colors["green"]).chr($colors["blue"]);

    return $str;

}

?>

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Answer 1

Your for loop runs forever because you wrote $i+3, instead of assigning that value to $i, which would be $i = $i + 3

So change this part:

for($i = 0;$i<(strlen($data)-3);$i+3)

into

for($i = 0;$i<(strlen($data)-3);$i+=3)

Php script loading forever not showing output

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