This is a fully functional version based on the idea of minimum viabl…

…e product.

README.md

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+# Media Post Permalink
+
+## Description 
+
+When Any media is uploaded in WordPress, by default wordpress creates the attachment(post) against it and set it's permalink using the post name (media name). 
+
+This plugin helps:
+
+* To add some prefix in all the Media/Attachments when you added/updated it.
+* To add some suffix in all the Media/Attachments when you added/updated it.
+* To add both prefix as well as suffix in all the Media/Attachments when you added/updated it.
+* Remove Parent Post (Parent Post adds it's permalink in the Media Permalink so, by this feature, None of the media would contains it's parent post).
+* Make the Permalinks User Friendly.
+
+### Advantages:
+
+* Adding prefix/suffix or both would help you to distinguish your attachment posts from the other posts.
+* Your Media doesn't reserve any permalink. Like, if you upload the image named services.png so, services permalink reserved by the Media/Attachment Post. By using this plugin, it won't happen anymore.
+* Your Permalinks would be user Friendly. Underscore doesn't be allowed anymore.
+
+You can define your own prefix and suffix from the settings page. By default, they are empty(Null). You can also choose whether you want to remove the Parent Post or not and whether you want the user-friendly Permalink or not.
+
+## Installation 
+
+The easiest way to install the plugin is to use the WP built-in menu for finding and installing new plugins directly from the WordPress repositories.
+
+If you need to install this using FTP or SFTP, you should follow these steps:
+
+1. Upload `media-post-permalink` to the `/wp-content/plugins/` directory using your favorite FTP client.
+2. Activate the plugin through the 'Plugins' menu in WordPress.
+3. Apply the settings as per your requirements.
+4. That's it.

admin/class.media-post-permalink.php

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+<?php
+
+/**
+ * @package MediaPostPermalink\Admin
+ */
+
+class Media_Post_Permalink_Admin {
+
+  private static $initiated = false;
+
+  /**
+	 * Initializes WordPress hooks
+	 */
+  public static function init() {
+    if ( ! self::$initiated ) {
+			self::$initiated = true;
+
+      add_action( 'admin_menu', array('Media_Post_Permalink_Admin', 'media_post_permalink_menu') );
+		}
+  }
+
+  /**
+   * Permalink Settings Menu
+   */
+  public static function media_post_permalink_menu() {
+	  add_menu_page('Media Post Permalink Settings', 'Media Permalinks', 'administrator', 'media-post-permalink-settings', array('Media_Post_Permalink_Admin', 'media_post_permalink_settings_page'));
+  }
+
+  /**
+   * Permalink Setting Page
+   */
+  public static function media_post_permalink_settings_page() {
+    if ( !current_user_can( 'administrator' ) )  {
+      wp_die( __( 'You do not have sufficient permissions to access this page.' ) );
+    }
+
+    if( isset($_POST['submit']) ) {
+      $user_friendly_enable = "off";
+      if($_POST['user_friendly'] == "on") {
+        $user_friendly_enable = "on";
+      }
+      $media_post_permalink_settings =  array(
+        'post_prefix'  =>  Media_Post_Permalink_Admin::media_post_permalink_sanitize($_POST['post_name_prefix'], $user_friendly_enable),
+        'post_suffix'  =>  Media_Post_Permalink_Admin::media_post_permalink_sanitize($_POST['post_name_suffix'], $user_friendly_enable),
+        'post_parent'  =>  $_POST['post_parent'],
+        'user_friendly'  =>  $_POST['user_friendly'],
+      );
+      update_option('media_post_permalink_settings', serialize( $media_post_permalink_settings ) );
+    }
+    $media_post_settings = unserialize( get_option('media_post_permalink_settings') );
+
+    $media_post_prefix = "";
+    $media_post_suffix = "";
+    $parent_post_checked = "";
+    $user_friendly_checked = "";
+    if(isset($media_post_settings['post_prefix']) && !empty($media_post_settings['post_prefix'])) {
+      $media_post_prefix = $media_post_settings['post_prefix'];
+    }
+    if(isset($media_post_settings['post_suffix']) && !empty($media_post_settings['post_suffix'])) {
+      $media_post_suffix = $media_post_settings['post_suffix'];
+    }
+    if(isset($media_post_settings['post_parent']) && !empty($media_post_settings['post_parent'])) {
+      $parent_post_checked = "checked";
+    }
+    if(isset($media_post_settings['user_friendly']) && !empty($media_post_settings['user_friendly'])) {
+      $user_friendly_checked = "checked";
+    }
+    wp_enqueue_style( 'style', plugins_url('/css/admin-style.min.css', __FILE__) );
+    ?>
+    <div class="wrap">
+    <h2>Media Post Permalink Settings</h2>
+    <div>Make your Media/Attachment Post Permalinks customize so, it doesn't conflict with your future/planned page permalinks.</div>
+    <form enctype="multipart/form-data" method="POST" action="" id="media-post-permalink">
+      <table class="media-post-admin-table">
+          <caption>Post Permalink Changes <b>(Optional)</b></caption>
+
+          <tr>
+            <th><label for="post-prefix">Post Prefix :</label></th>
+            <td>
+              <input type="text" name="post_name_prefix" id="post_prefic_name" class="regular-text" value="<?php echo $media_post_prefix; ?>" />
+              <small>Example: media-prefix</small>
+            </td>
+          </tr>
+          <tr>
+            <th><label for="post-suffix">Post Suffix :</label></th>
+            <td>
+              <input type="text" name="post_name_suffix" id="post_suffix_name" class="regular-text" value="<?php echo $media_post_suffix; ?>" />
+              <small>Example: media-suffix</small>
+            </td>
+          </tr>           
+        </table>
+        <table class="media-post-admin-table">
+          <caption>Parent Post <b>(Recommended)</b></caption>
+          <tbody>
+            <tr>
+              <td class="extra-space"></td>
+              <td><input type="checkbox" name="post_parent" value="on" <?php echo $parent_post_checked; ?> /><strong>Don't Attach the Media with any Post</strong><br><small>When you upload the Featured Image in Post, That post becomes the Parent Post of the Media or in other words that media would attach to the respective post.</small></td>
+            </tr>
+          </tbody>
+        </table>
+        <table class="media-post-admin-table">
+          <caption>Make URL User-Friendly <b>(Recommended)</b></caption>
+          <tbody>
+            <tr>
+              <td class="extra-space"></td>
+              <td><input type="checkbox" name="user_friendly" value="on" <?php echo $user_friendly_checked; ?> /><strong>Replaces UnderScore(_) with Dash(-)</strong><br><small>This check will replace all the underscore with dash in the permalink. According to SEO, Underscore should not be included in the URL.</small></td>
+            </tr>
+          </tbody>
+        </table>
+        <p><strong>Note:</strong> Don't use special characters. You can only use Numeric, Alphabets, Dash(<b>-</b>) and underscore(<b>_</b>). If you used some other keywords Like Plus(<b>+</b>), Slash(<b>/</b>) etc, it's removed automatically. Underscore can be used but it should not be used as per SEO.</p>
+      <?php submit_button(); ?>
+    </form>
+    </div>
+    <?php
+  }
+
+  /**
+   * Sanitize the String(Make the CAPITAL letters to SMALL, Remove special characters, Replace Undersocre with Dash )
+   */ 
+  public static function media_post_permalink_sanitize($sanitize_string, $user_friendly) {
+    $sanitize_string = strtolower($sanitize_string);
+    $sanitize_string = preg_replace("/[^a-z0-9_\s-]/", "", $sanitize_string);
+    $sanitize_string = preg_replace("/[\s-]+/", " ", $sanitize_string);
+    if($user_friendly == "on") {
+      $sanitize_string = preg_replace("/[\s_]/", "-", $sanitize_string);
+    } else {
+      $sanitize_string = preg_replace("/[\s]/", "-", $sanitize_string);
+    }
+    $sanitize_string = trim($sanitize_string, "-");
+
+    return $sanitize_string;
+  }
+}

admin/css/admin-style.css

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+/** Posts page */
+.media-post-admin-table {
+	margin: 15px 0 15px 0;
+}
+.media-post-admin-table caption {
+	border-left: solid 4px #00a0d2;
+	margin: 0 0 5px 0;
+	padding: 3px 0 3px 7px;
+	text-align: left;
+}
+.media-post-admin-table th {
+	height: 2em;
+	padding: 0 5px 0 0;
+	text-align: right;
+	vertical-align: middle;
+	width: 150px;
+}
+.media-post-admin-table td {
+	vertical-align: middle;
+}
+.media-post-admin-table td label {
+	margin: 0 10px 0 0;
+}
+.media-post-admin-table small {
+	margin: 0 0 0 5px;
+}
+.media-post-admin-table input[type="checkbox"] {
+	margin: 0 5px 0 0;
+}
+.media-post-admin-table td.extra-space {
+	width: 50px;
+}
+strong {
+    font-size: 14px;
+}

admin/index.php

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+<?php
+/**
+ * Silence is golden
+ */

index.php

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+<?php
+/**
+ * Silence is golden
+ */