50-fake-users-as-csv.php

<?php
/**
 * Simple script to generate a bunch of randomish names, email addresses
 * etc. Outputs CSV which can be piped into a file, etc.
 *
 * Adapt and modify as needed...remember there are more powerful tools out
 * there for this sort of thing if you have more complicated needs:
 *
 * @see https://github.com/fzaninotto/Faker
 * @see https://github.com/gevans/phaker
 */

$first_names = [
	'Abbas',
	'Annabelle',
	'Archie',
	'Belinda',
	'Bruce',
	'Davey',
	'Donna',
	'Edna',
	'Edgar',
	'Ethelbert',
	'Fakhir',
	'Fiona',
	'Fred',
	'Gayle',
	'Greg',
	'Heidi',
	'Henry',
	'Ingrid',
	'Innis',
	'Jabbar',
	'Jim',
	'Joanne',
	'Kareem',
	'Karen',
	'Kevin',
	'Len',
	'Lena',
	'Martin',
	'Melinda',
	'Mubarak',
	'Nina',
	'Norbert',
	'Oscar',
	'Othella',
	'Patricia',
	'Paul',
	'Qing',
	'Quentin',
	'Radwan',
	'Rachel',
	'Sadie',
	'Samuel',
	'Tabitha',
	'Timin',
	'Tony',
	'Umberto',
	'Una',
	'Veronica',
	'Victor',
	'William',
	'Wilma',
	'Xanthe',
	'Xavier',
	'Yael',
	'Yasmine',
	'Zandra',
	'Zane',
];

$last_names = [
	'Almasi',
	'Anderson',
	'Brucefield',
	'Coleman',
	'Dickinson',
	'Essa',
	'Franco',
	'Garcia',
	'Hernandez',
	'Inglis',
	'Jordan',
	'Kelly',
	'Khan',
	'Khoury',
	'King',
	'Lín',
	'Maldonado',
	'Nahas',
	'Núnez',
	'Otherly',
	'Phillips',
	'Quigley',
	'Rodríguez',
	'Sandringham',
	'Thompson',
	'Underhill',
	'Veracruz',
	'Wasem',
	'Wilson',
	'Wong',
	'Xanderson',
	'Xiāo',
	'Yule',
	'Zhang',
];

$email_providers = [
	'grabmail.fake.info',
	'instapost.test.email',
	'offline.simulated.net',
	'pretend.user.web',
	'quickimail.interwebs',
	'test.example.com',
];

$roles = [
	'subscriber',
	'contributor',
	'administrator',
];

shuffle( $first_names );
shuffle( $last_names );
$out = [];

while ( count( $out ) < 50 ) {
	if ( ! next( $first_names ) ) {
		shuffle( $first_names );
		reset( $first_names );
	}

	if ( ! next( $last_names ) ) {
		shuffle( $last_names );
		reset( $last_names );
	}

	$first_name = current( $first_names );
	$last_name = current( $last_names );
	$possible_name = "$first_name $last_name";

	if ( isset( $out[ $possible_name ] ) ) {
		continue;
	}

	$slug = str_replace( ' ', '-', strtolower( $possible_name ) );
	$email_provider = $email_providers[ array_rand( $email_providers ) ];

	$out[ $possible_name ] = [
		'username' => "{$slug}_test_user",
		'email'    => "{$slug}@{$email_provider}",
		'role'     => $roles[ array_rand( $roles ) ],
	];
}

foreach ( $out as $name => $property ) {
	print "{$name},{$property['username']},{$property['email']},{$property['role']}\n";
}

Sample use:

php 50-fake-users-as-csv.php > my-user-list.csv