mypmpro-member-directory-search-shortcode.php

<?php
/**
 * This recipe will create the [pmpro_member_search] shortcode, allowing to you to search 
 * your member directory.
 *
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 
 function mypmpro_member_search(){

	$url = 'https://mysite.com/member-directory'; //Change this line to the member directory URL

	$ret = "";

	if(isset($_REQUEST['limit'])){
		$limit = intval($_REQUEST['limit']);
	} else if(empty($limit)){
		$limit = 15;
	}
	
	if( !empty( $_REQUEST['ps'] ) ){
		$ps =  stripslashes( esc_attr( $_REQUEST['ps'] ) );
	} else {
		$ps = '';
	}

	$ret .= '<form role="search" method="post" class="pmpro_member_directory_search search-form" action="'.$url.'">';
		$ret .= '<label>';
			$ret .= '<span class="screen-reader-text">'.__('Search for:','pmpromd').'</span>';
			$ret .= '<input type="search" class="search-field" placeholder="'.__('Search Members','pmpromd').'" name="ps" value="'.$ps.'" title="'.__('Search Members','pmpromd').'" />';
			$ret .= '<input type="hidden" name="limit" value="'.esc_attr($limit).'" />';
		$ret .= '</label>';
		$ret .= '<input type="submit" class="search-submit" value="'.__('Search Members','pmpromd').'">';
	$ret .= '</form>';

	return $ret;

}
add_shortcode( 'pmpro_member_search', 'mypmpro_member_search' );