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run code in 300+ PHP versions simultaneously

@ 2023-01-06T05:14:46Z

<?php

define('FIELDS', ['name', 'address', 'city']);
define(
    'HTML_FIELD_FORM',
    <<<'HTML'
    <h2>%1$s</h2>
    <form method="post" autocomplete="off">
        <input type="text" name="%1$s" autocomplete="off" placeholder="%1$s"><br>
        <input value="submit" type="submit">
    </form>
    HTML
);
define(
    'HTML_CLEAR_FORM',
    <<<'HTML'
    <form method="post" autocomplete="off">
        <input type="text" name="%1$s" value="1" hidden><br>
        <input value="%1$s" type="submit">
    </form>
    HTML
);

foreach (FIELDS as $field) {
    if (isset($_POST[$field])) {
        // Set session & cookie from post 
        $_SESSION[$field] = $_POST[$field]; 
        setcookie($field, $_POST[$field]);
    } elseif (isset($_COOKIE[$field])) {
        // Set session from cookie
        $_SESSION[$field] = $_COOKIE[$field];
    } elseif (!isset($_SESSION[$field])) {
        // Present individual field form
        printf(HTML_FIELD_FORM, $field);
    }
}

foreach (['clear_session', 'clear_cookies'] as $action) {
    printf(HTML_CLEAR_FORM, $action);
}

Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: <h2>name</h2> <form method="post" autocomplete="off"> <input type="text" name="name" autocomplete="off" placeholder="name"><br> <input value="submit" type="submit"> </form><h2>address</h2> <form method="post" autocomplete="off"> <input type="text" name="address" autocomplete="off" placeholder="address"><br> <input value="submit" type="submit"> </form><h2>city</h2> <form method="post" autocomplete="off"> <input type="text" name="city" autocomplete="off" placeholder="city"><br> <input value="submit" type="submit"> </form><form method="post" autocomplete="off"> <input type="text" name="clear_session" value="1" hidden><br> <input value="clear_session" type="submit"> </form><form method="post" autocomplete="off"> <input type="text" name="clear_cookies" value="1" hidden><br> <input value="clear_cookies" type="submit"> </form>

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131.95 ms | 404 KiB | 89 Q