can't upload image using imagejpg - php

Question

I use this function for resize and upload image.
code:
function getExtension($str) {
$i = strrpos($str,".");
if (!$i) { return ""; }
$l = strlen($str) - $i;
$ext = substr($str,$i+1,$l);
return $ext;
}
function createThumbnail($widthbig,$widththumb,$image_directory,$image_directory_thumb,$newfilename,$newfilenamethumb,$source) {
define ("MAX_SIZE","5000");
$errors=0;
//$image =$_FILES["post_images"]["name"];
//$uploadedfile = $_FILES['file']['tmp_name'];
if ($newfilename)
{
$file = stripslashes($newfilename);
$extension = $this->getExtension($file);
$extension = strtolower($extension);
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif"))
{
echo ' Unknown Image extension ';
$errors=1;
}
else
{
$size= filesize($source);
if ($size > MAX_SIZE*1024)
{
echo "You have exceeded the size limit";
$errors=1;
}
if($extension=="jpg" || $extension=="jpeg" )
{
//$source = $source;
$src = imagecreatefromjpeg($source);
}
else if($extension=="png")
{
//$uploadedfile = $source;
$src = imagecreatefrompng($source);
}
else
{
$src = imagecreatefromgif($source);
}
list($width,$height)=getimagesize($source);
$newwidth=$widthbig;
$newheight=($height/$width)*$newwidth;
$tmp=imagecreatetruecolor($newwidth,$newheight);
$newwidth1=$widththumb;
$newheight1=($height/$width)*$newwidth1;
$tmp1=imagecreatetruecolor($newwidth1,$newheight1);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,
$width,$height);
imagecopyresampled($tmp1,$src,0,0,0,0,$newwidth1,$newheight1,
$width,$height);
$dirfile = $image_directory. $newfilename;
$dirfile1 = $image_directory_thumb. $newfilenamethumb;
if($extension=="jpg" || $extension=="jpeg" )
{
$upload = imagejpeg($tmp,$dirfile,100);
$upload1 = imagejpeg($tmp1,$dirfile1,100);
}
else if($extension=="png")
{
$upload = imagepng($tmp,$dirfile,100);
$upload1 = imagepng($tmp1,$dirfile1,100);
}
else if($extension=="gif")
{
$upload = imagegif($tmp,$dirfile,100);
$upload1 = imagegif($tmp1,$dirfile1,100);
}
imagedestroy($src);
imagedestroy($tmp);
imagedestroy($tmp1);
}
}
}
before, this function work in php 5.x but when in 7 this not work and give return null after i var_dump the imagejpg("xx","xx","xx"); end the result is false.
I have try to search in google but not get the same problem.
whats wrong whit this code, and how to fix this?
thanks

Answer 1

I was fix this : can't upload because permission denied in target folder
change to
chmod -r 0757 target_dir