A naive acronym generator

acronyzer.php

<?php


$things = [
    // WORKING TEST CASES
    'Aangenaam Door Vermaak En Nuttig Door Ontspanning'                     => 'ADVENDO',       // "Pleasant by entertainment and useful by relaxation")[28][29]
    'abdominal aortic aneurysm'                                             => 'AAA',
    'Amateur Athletic Association'                                          => 'AAA',
    'American Automobile Association'                                       => 'AAA',
    'American Standard Code for Information Interchange'                    => 'ASCII',
    'anti-aircraft artillery'                                               => 'AAA',
    'AOL Instant Messenger'                                                 => 'AIM',
    'Asistencia, Asesoría y Administración'                                 => 'AAA',
    'automated teller machine'                                              => 'ATM',
    'British Broadcasting Company'                                          => 'BBC',
    'compact disc'                                                          => 'CD',
    'digital video disc'                                                    => 'DVD',
    'frequently asked questions'                                            => 'FAQ',
    'GNU Image Manipulation Program'                                        => 'GIMP',
    'Graphics Interchange Format'                                           => 'GIF',
    'GTK+ AOL Instant Messenger'                                            => 'GAIM',
    'human immunodeficiency virus'                                          => 'HIV',
    'individual retirement account'                                         => 'IRA',
    'Institute of Electrical and Electronics Engineers'                     => 'IEEE',
    'International Union of Pure and Applied Chemistry'                     => 'IUPAC',
    'Joint Photographic Experts Group'                                      => 'JPEG',
    'light amplification by stimulated emission of radiation'               => 'Laser',
    'liquid-crystal display'                                                => 'LCD',
    'National Aeronautics and Space Administration'                         => 'NASA',
    'National Association for the Advancement of Colored People'            => 'NAACP',
    'National Collegiate Athletic Association'                              => 'NCAA',
    'NOAD ADVENDO Combinatie'                                               => 'NAC',
    'Nooit Opgeven Altijd Doorgaan'                                         => 'NOAD',          // "Never give up, always persevere")
    'North Atlantic Treaty Organization'                                    => 'NATO',
    'original equipment manufacturer'                                       => 'OEM',
    'personal identification number'                                        => 'PIN',
    'self-contained underwater breathing apparatus'                         => 'Scuba',
    'Structured Query Language'                                             => 'SQL',
    'United States of America'                                              => 'USA',
    'Very High Speed Integrated Circuit'                                    => 'VHSIC',
    'VHSIC hardware description language'                                   => 'VHDL',

    'Hypertext Preprocessor'                                                => 'PHP',
    'Hypertext Markup Language'                                             => 'HTML',
    'Cascading Stylesheets'                                                 => 'CSS',
    'Javascript'                                                            => 'JS',

    // KNOWN FAILURE CASES DUE TO SOPHISTICATED RULES
    'alpha-methyl-phenethylamine'                                           => 'Amphetamine',
    'Command, Control, Communications, Computers, Intelligence, Surveillance, Target Acquisition, and Reconnaissance' => 'C4ISTAR',         // (C-four Istar)
    'compact disc read-only memory'                                         => 'CD-ROM',
    'Geheime Staatspolizei'                                                 => 'Gestapo',       // ('Secret State Police')
    'International Information Systems Security Certification Consortium'   => '(ISC)²',        // (ISC squared)
    'Minnesota Mining and Manufacturing Company'                            => '3M',            // (three M) originally
    'Museum of Modern Art'                                                  => 'MOMA',
    'oculocutaneous albinism'                                               => 'OCA',
    'paracoccidioidomycosis'                                                => 'PCM',
    'polymorphonuclear leukocytes'                                          => 'PMN',
    'radio detection and ranging'                                           => 'Radar',
    'San Francisco Museum of Modern Art'                                    => 'SFMOMA',
    'World Wide Web Consortium'                                             => 'w3C',           // (W-three C)

];


/**
 * Naive acronym generator
 * @param  string $str The string we wish to build an acronym from
 * @return string      The resulting acronym without explicit case formatting
 */
function acronyze(string $str) {

    $str    = preg_replace('/[-,\.]/', ' ', $str);
    $str    = preg_replace('/\s+/', ' ', $str);

    $parts  = explode(' ', $str);

    $res    = '';

    foreach ($parts as $part) {

        $part       = trim(strtolower($part));
        $continue   = false;

        switch($part) {
            case 'a':
            case 'and':
            case 'by':
            case 'for':
            case 'of':
            case 'the':
            case 'y':
                $continue = true;
                break;
        }

        if ($continue) {
            continue;
        }

        $res .= substr($part, 0, 1);
    }

    return strtoupper($res);
}





foreach ($things as $label => $proof) {
    $result = acronyze($label);
    $bool   = strtoupper($result) === strtoupper($proof) ? 'true ' : 'false';

    echo "{$bool} :: {$proof} - {$result} - {$label}". PHP_EOL;
}