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@ 2022-01-08T19:13:52Z

<?php

function maybe_change_user_language( $selected_lang, $user_lang ) {
    if ( $selected_lang !== $user_lang ) {
        $user_lang = $selected_lang;
    }
    
    return $user_lang;
}

// Tests - Scroll to the bottom for results.

function test_respect_user_language_preference( $expected, $site_lang, $user_lang, $selected_lang = 'English' ) {
    $user_lang = maybe_change_user_language(
        $selected_lang,
        $user_lang
    );
    
    echo 'Expected: ', $expected, PHP_EOL;
    echo 'Actual:   ', $user_lang, PHP_EOL;
    
    return 'Result:   ' . ( $expected === $user_lang ? 'Pass' : 'Fail' );
}

$tests = array(
    'defaults with nothing selected'              => array(
        'expected'      => 'English',
        'site_lang'     => 'English',
        'user_lang'    => 'English',
        'selected_lang' => 'English',
    ),
    'no existing preference and selects Spanish'  => array(
        'expected'      => 'Spanish',
        'site_lang'     => 'English',
        'user_lang'     => 'English',
        'selected_lang' => 'Spanish',
    ),
    'already prefers Spanish and selects Spanish' => array(
        'expected'      => 'Spanish',
        'site_lang'     => 'English',
        'user_lang'     => 'Spanish',
        'selected_lang' => 'Spanish',
    ),
    'already prefers Spanish and selects nothing' => array(
        'expected'      => 'Spanish',
        'site_language' => 'English',
        'user_lang'     => 'Spanish',
        'selected_lang' => 'English',
    ),
);

foreach ( $tests as $test => $args ) {
    $sep = str_pad( '', strlen( $test ), '=' );
    echo $sep, PHP_EOL, $test, PHP_EOL, $sep, PHP_EOL;
    echo test_respect_user_language_preference( ...array_values( $args ) ), PHP_EOL, PHP_EOL;
}

Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.4, 8.3.6 - 8.3.15, 8.4.1 - 8.4.2: ============================== defaults with nothing selected ============================== Expected: English Actual: English Result: Pass ========================================== no existing preference and selects Spanish ========================================== Expected: Spanish Actual: Spanish Result: Pass =========================================== already prefers Spanish and selects Spanish =========================================== Expected: Spanish Actual: Spanish Result: Pass =========================================== already prefers Spanish and selects nothing =========================================== Expected: Spanish Actual: English Result: Fail
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 ============================== defaults with nothing selected ============================== Expected: English Actual: English Result: Pass ========================================== no existing preference and selects Spanish ========================================== Expected: Spanish Actual: Spanish Result: Pass =========================================== already prefers Spanish and selects Spanish =========================================== Expected: Spanish Actual: Spanish Result: Pass =========================================== already prefers Spanish and selects nothing =========================================== Expected: Spanish Actual: English Result: Fail

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