Upload base64 to file in PHP

While we have working with API for mobile or web application , You will notice that they will send the format of images in Base64 encoded. So in that case, you will need to move the Base64 encoded image to server as a image file.and have to save it in the folder

Example Core PHP:

<?php
    $base64string = '';
    $uploadpath   = 'upload/images/';
    $parts        = explode(";base64,", $base64string);
    $imageparts   = explode("image/", @$parts[0]);
    $imagetype    = $imageparts[1];
    $imagebase64  = base64_decode($parts[1]);
    $file         = $uploadpath . uniqid() . '.png';
    file_put_contents($file, $imagebase64);
?> 

Upload base64 to file in Codeigniter 
create file application/libraries/Base64fileUploads.php

<?php defined('BASEPATH') OR exit('No direct script access allowed');
class Base64fileUploads { 
    
    function is_base64($s){
        // Check if there are valid base64 characters
       // if (!preg_match('/^[a-zA-Z0-9\/\r\n+]*={0,2}$/', $s)) return false;
        // Decode the string in strict mode and check the results
        $decoded = base64_decode($s, true);
        if(false === $decoded) return false;
        // Encode the string again
        if(base64_encode($decoded) != $s) return false;
        return true;
    }
    
    public function du_uploads($path,$base64string){
        if(
            $this->is_base64($base64string) == true 
        ){  
            $base64string = "data:image/jpeg;base64,".$base64string;
            $this->check_size($base64string);
            $this->check_dir($path);
            $this->check_file_type($base64string);
            
            /*=================uploads=================*/
            list($type, $base64string) = explode(';', $base64string);
            list(,$extension)          = explode('/',$type);
            list(,$base64string)       = explode(',', $base64string);
            $fileName                  = uniqid().date('Y_m_d').'.'.$extension;
            $base64string              = base64_decode($base64string);
            file_put_contents($path.$fileName, $base64string);
            return array('status' =>true,'message' =>'successfully upload !','file_name'=>$fileName,'with_path'=>$path.$fileName);
        }else{
            print_r(json_encode(array('status' =>false,'message' => 'This Base64 String not allowed !')));exit;
        }
    }
    
    public function check_size($base64string){
        $file_size = 8000000;
        $size = @getimagesize($base64string);
        
        if($size['bits'] >= $file_size){
            print_r(json_encode(array('status' =>false,'message' => 'file size not allowed !')));exit;
        }
        return true;
    }
    
    public function check_dir($path){
        if (!file_exists($path)) {
            mkdir($path, 0777, true);
            return true;
        }
        return true;
    }
    
    public function check_file_type($base64string){
        $mime_type = @mime_content_type($base64string);
        $allowed_file_types = ['image/png', 'image/jpeg', 'application/pdf'];
        if (! in_array($mime_type, $allowed_file_types)) {
            // File type is NOT allowed
           // print_r(json_encode(array('status' =>false,'message' => 'File type is NOT allowed !')));exit;
        }
        return true;
    }
}

Call this class Codeigniter in controller 

$base64file   = new Base64fileUploads();
$return = $base64file->du_uploads($this->data['document'],$document_front_site);
$db_file_name = $return['file_name'];