Create main feature of plugin

Author: ikamal7

index.php

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+<?php
+    //Silence is golden

posts-qr-code.php

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+<?php
+    /**
+     * Plugin Name: Posts QR Code
+     * Description: Display QR Code under every posts
+     * Plugin URI: http://github.com/ikamal7/posts-qr-code-wp-plugin/
+     * Author: Kamal Hosen
+     * Author URI: http://ikamal.me/
+     * Version: 1.0.0
+     * License: GPL2
+     * Text Domain: posts-qrcode
+     * Domain Path: /languages/
+     */
+    
+    /**
+     * Copyright (C) 2018  Kamal  kamalhosen8920@gmail.com
+     *
+     * This program is free software; you can redistribute it and/or modify
+     * it under the terms of the GNU General Public License, version 2, as
+     * published by the Free Software Foundation.
+     *
+     * This program is distributed in the hope that it will be useful,
+     * but WITHOUT ANY WARRANTY; without even the implied warranty of
+     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     * GNU General Public License for more details.
+     *
+     * You should have received a copy of the GNU General Public License
+     * along with this program; if not, write to the Free Software
+     * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+     */
+    
+    
+    function pqrc_load_textdomain() {
+        load_plugin_textdomain( 'posts-qrcode', false, dirname( __FILE__ ) . '/languages' );
+    }
+    
+    
+    function pqrc_display_qr_code( $content ) {
+        $current_post_id    = get_the_ID();
+        $current_post_title = get_the_title( $current_post_id );
+        $current_post_url   = urlencode_deep( get_the_permalink( $current_post_id ) );
+        $current_post_type  = get_post_type( $current_post_id );
+        /**
+         * Post Type Check
+         */
+        $excluded_post_types = apply_filters( 'pqrc_excluded_post_types', array() );
+        if ( in_array( $current_post_type, $excluded_post_types ) ){
+            return $content;
+        }
+    
+        /**
+         * Dimension Hook
+         *
+         */
+        $dimension = apply_filters('pqrc_qrcode_img_dimension', '185x185');
+    
+        /**
+         * Image Attributes
+         */
+        $image_attributes = apply_filters('pqrc_image_attributes', null);
+        /**
+         * Generate QR Code
+         */
+        $img_src = sprintf( 'https://api.qrserver.com/v1/create-qr-code/?size=%s&data=%s', $dimension, $current_post_url );
+        $content .= sprintf( '<div class="qrcode"><img %s src="%s" alt="%s" /></div>', $image_attributes, $img_src, $current_post_title );
+        
+        return $content;
+    }
+    
+    add_filter( 'the_content', 'pqrc_display_qr_code' );
+