Drawing shapes on image and saving it in PHP - php

Question

I am trying to read an image from a location in my server and then draw lines on it and then overwrite the image in the location.
My code is as follows:
function drawShapes($src_path, $json)
{
echo "---inside draw Sharpes-------";
$x1= $json['x1'];
$y1= $json['y1'];
$x2= $json['x2'];
$y2= $json['y2'];
$x3= $json['x3'];
$y3= $json['y3'];
$x4= $json['x4'];
$y4= $json['y4'];
$type = exif_imagetype($src_path);
$allowedTypes = array(
1, // [] gif
2, // [] jpg
3, // [] png
);
if (!in_array($type, $allowedTypes)) {
return false;
}
switch ($type) {
case 1 :
$im = imageCreateFromGif($src_path);
break;
case 2 :
$im = imageCreateFromJpeg($src_path);
break;
case 3 :
$im = imageCreateFromPng($src_path);
break;
}
if (!$im)
return false;
imagesetthickness($im, 5);
$color = imagecolorallocate($im, 255, 255, 255);
echo $color;
imageline($im, $x1, $y1, $x2, $y2, $color);
imageline($im, $x2, $y2, $x3, $y3, $color);
imageline($im, $x3, $y3, $x4, $y4, $color);
imageline($im, $x4, $y4, $x1, $y1, $color);
header("Content-type: image/jpeg");
imagejpeg($im,$src_path);
imagedestroy($im);
}
Here $src_path= "uploads/case.jpg"- uploads is a folder inside my solution & case.jpg is the image file name.
But I am getting image missing icon as output. What is the mistake I do?
What is the solution to it? Thank you.

Answer 1

You are echoing data before you send the headers.
If you want to overwrite the image in the location and then display it in the browser, maybe you can work with this adjustment:
<?php
function drawShapes($src_path, $json)
{
//echo "---inside draw Sharpes-------";
$x1= $json['x1'];
$y1= $json['y1'];
$x2= $json['x2'];
$y2= $json['y2'];
$x3= $json['x3'];
$y3= $json['y3'];
$x4= $json['x4'];
$y4= $json['y4'];
$type = exif_imagetype($src_path);
$allowedTypes = array(
1, // [] gif
2, // [] jpg
3, // [] png
);
if (!in_array($type, $allowedTypes)) {
return false;
}
switch ($type) {
case 1 :
$im = imageCreateFromGif($src_path);
break;
case 2 :
$im = imageCreateFromJpeg($src_path);
break;
case 3 :
$im = imageCreateFromPng($src_path);
break;
}
if (!$im)
return false;
imagesetthickness($im, 5);
$color = imagecolorallocate($im, 255, 255, 255);
//echo $color;
imageline($im, $x1, $y1, $x2, $y2, $color);
imageline($im, $x2, $y2, $x3, $y3, $color);
imageline($im, $x3, $y3, $x4, $y4, $color);
imageline($im, $x4, $y4, $x1, $y1, $color);
imagejpeg($im,$src_path);
imagedestroy($im);
$fp = fopen($src_path, 'rb');
header("Content-Type: image/jpeg");
header("Content-Length: " . filesize($src_path));
fpassthru($fp);
exit;
}