AFAIK, You have to use image function imagecreatefromstring, imagejpeg to create the images.
$imageData = base64_decode($imageData);
$source = imagecreatefromstring($imageData);
$rotate = imagerotate($source, $angle, 0); // if want to rotate the image
$imageSave = imagejpeg($rotate,$imageName,100);
imagedestroy($source);
Hope this will help.
PHP CODE WITH IMAGE DATA
$imageDataEncoded = base64_encode(file_get_contents('sample.png'));
$imageData = base64_decode($imageDataEncoded);
$source = imagecreatefromstring($imageData);
$angle = 90;
$rotate = imagerotate($source, $angle, 0); // if want to rotate the image
$imageName = "hello1.png";
$imageSave = imagejpeg($rotate,$imageName,100);
imagedestroy($source);
So Following is the php part of your program .. NOTE
the change with comment Change is here
$uploadedPhotos = array('photo_1','photo_2','photo_3','photo_4');
foreach ($uploadedPhotos as $file) {
if($this->input->post($file)){
$imageData = base64_decode($this->input->post($file)); // <-- **Change is here for variable name only**
$photo = imagecreatefromstring($imageData); // <-- **Change is here**
/* Set name of the photo for show in the form */
$this->session->set_userdata('upload_'.$file,'ant');
/*set time of the upload*/
if(!$this->session->userdata('uploading_on_datetime')){
$this->session->set_userdata('uploading_on_datetime',time());
}
$datetime_upload = $this->session->userdata('uploading_on_datetime',true);
/* create temp dir with time and user id */
$new_dir="temp/user_".$this->session->userdata('user_id',true).'_on_'.$datetime_upload."https://stackoverflow.com/";
if(!is_dir($new_dir)){
@mkdir($new_dir);
}
/* move uploaded file with new name */
// @file_put_contents( $new_dir.$file.'.jpg',imagejpeg($photo));
imagejpeg($photo,$new_dir.$file.'.jpg',100); // <-- **Change is here**
}
}