[PHP-NOTES] note 130613 added to function.fdiv

Subject: Compatibility for older PHP

Text: Equivalent for versions before 8.0. Handles the sign of zero for INF results.

<?php
if (!function_exists('fdiv')) {
    function fdiv(float $a, float $b): float
    {
        if (is_nan($a) || is_nan($b)) return NAN;
        if ($b != 0.0) return $a / $b;
        if ($a == 0.0) return NAN;

        $check = function ($v) {
            if ($v > 0) return 1;
            if ($v < 0) return -1;
            return pack('d', (float)$v) === pack('d', 0.0) ? 1 : -1;
        };

        return ($check($a) === $check($b)) ? INF : -INF;
    }
}
?>
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Manual Page -- https://php.net/manual/en/function.fdiv.php
Edit        -- https://main.php.net/note/edit/130613
Del: integrated  -- https://main.php.net/note/delete/130613/integrated
Del: useless     -- https://main.php.net/note/delete/130613/useless
Del: bad code    -- https://main.php.net/note/delete/130613/bad+code
Del: spam        -- https://main.php.net/note/delete/130613/spam
Del: non-english -- https://main.php.net/note/delete/130613/non-english
Del: in docs     -- https://main.php.net/note/delete/130613/in+docs
Del: other reasons-- https://main.php.net/note/delete/130613
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