remove-unuseful-wp-stuff.php

<?php
//***MEGA REMOVAL OF BACKEND THINGS**********************************************
//There is apparently no easy way to remove the fields, so you have to
//unset some, filter others, and inline hide one or two
//sorry in advance for this mess of spaghetti code
//********************************************************************************

  //Remove Admin Color Scheme Options from WordPress dashboard

  remove_action( 'admin_color_scheme_picker', 'admin_color_scheme_picker' );

  if ( ! function_exists( 'cor_remove_personal_options' ) ) {
    /**
     * Removes the leftover 'Visual Editor', 'Keyboard Shortcuts' and 'Toolbar' options.
     */
    function cor_remove_personal_options( $subject ) {
      $subject = preg_replace( '#<h3>Personal Options</h3>.+?/table>#s', '', $subject, 1 );
      return $subject;
    }

    function cor_profile_subject_start() {
      ob_start( 'cor_remove_personal_options' );
    }

    function cor_profile_subject_end() {
      ob_end_flush();
    }
  }

  add_action( 'admin_head-user-edit.php', 'cor_profile_subject_start' );
  add_action( 'admin_footer-user-edit.php', 'cor_profile_subject_end' );

  // Remove Default Bio Field From User Profile Pages

  function remove_plain_bio($buffer) {
    $titles = array('#<h3>About Yourself</h3>#','#<h3>About the user</h3>#');
    $buffer=preg_replace($titles,'<h3>Password</h3>',$buffer,1);
    $biotable='#<h3>Password</h3>.+?<table.+?/tr>#s';
    $buffer=preg_replace($biotable,'<h3>Password</h3> <table class="form-table">',$buffer,1);
    return $buffer;
  }

  function profile_admin_buffer_start() { ob_start("remove_plain_bio"); }
  function profile_admin_buffer_end() { ob_end_flush(); }

  add_action('admin_head', 'profile_admin_buffer_start');
  add_action('admin_footer', 'profile_admin_buffer_end');

  //Remove the Your Profile Field Settings

  function remove_website_row_wpse_94963_css()
  {
      echo '<style>tr.user-url-wrap{ display: none; }</style>';
  }
  add_action( 'admin_head-user-edit.php', 'remove_website_row_wpse_94963_css' );
  add_action( 'admin_head-profile.php',   'remove_website_row_wpse_94963_css' );

  function hide_personal_options(){
  echo "\n" . '<script type="text/javascript">jQuery(document).ready(function($) { $(\'form#your-profile > h3:first\').hide(); $(\'form#your-profile > table:first\').hide(); $(\'form#your-profile\').show(); });</script>' . "\n";
  }
  add_action('admin_head','hide_personal_options');

  //Hide the Website Field
  function mod_backend_new_user_fields() { ?>
    <script type="text/javascript">
      // Remove selected fields only
      var hideFields = ["url" ];
      jQuery.each( jQuery( "tr.form-field" ), function() {
        var field = jQuery( this ).find( "input" ).attr( "id" );
        if ( hideFields.indexOf( field ) != -1 ) {
          jQuery( this ).remove();
        }
      });
    </script>
  <?php }
  add_action( 'admin_footer-user-new.php', 'mod_backend_new_user_fields' );


  //Hides the Unused Roles
  add_action( 'editable_roles' , 'hide_unused_roles' );

  function hide_unused_roles( $roles ){

      unset( $roles['contributor'] );
      unset( $roles['author'] );
      unset( $roles['editor'] );

    return $roles;
  }


  //**** END OF THE SPAGHETTI!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~