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@ 2015-11-23T10:15:54Z

<?

// alle Formeln nach http://www.wettermail.de/wetter/feuchte.html
$temperatur = 5;
$relfeuchte = 85;
//Taupunktberechnung in °C
function Taupunkt($temperatur,$relfeuchte)
{
    $val = (234.67*0.434292289*log(6.1*exp((7.45*$temperatur)
            /(234.67+$temperatur)*2.3025851)*$relfeuchte/100/6.1))
            /(7.45-0.434292289*log(6.1*exp((7.45*$temperatur)
            /(234.67+$temperatur)*2.3025851)*$relfeuchte/100/6.1) );
    return $val;
}
//Sättigungsdampfdruck in hPa
function SaettigungsDampfDruck($temperatur)
{
    if ($temperatur >= 0)
    {
        $a = 7.5;
        $b = 237.3;
    }
    elseif ($temperatur < 0)
    {
        $a = 7.6;
        $b = 240.7;
    }
    $val = (6.1078 * exp( log(10) * (($a * $temperatur) / ($b + $temperatur)) ) );
    return $val;
}
//Dampfdruck in hPa
function DampfDruck($temperatur,$relfeuchte)
{
    $val = $relfeuchte/100 * SaettigungsDampfDruck($temperatur);
    return $val;
}
//absolute Feuchte in g/m³
function AbsoluteFeuchte($temperatur,$relfeuchte)
{
    $tk = ($temperatur + 273.15);
    $val  = (exp(log(10) * 5) * 18.016/8314.3 * DampfDruck($temperatur,$relfeuchte)/$tk);
    return $val;
}

$taupunkt = Taupunkt($temperatur,$relfeuchte);
$sattdampfdruck = SaettigungsDampfDruck($temperatur);
$dampfdruck = DampfDruck($temperatur,$relfeuchte);
$absfeuchte = AbsoluteFeuchte($temperatur,$relfeuchte);

echo $absfeuchte;


?>

Output for git.master, git.master_jit, rfc.property-hooks: <? // alle Formeln nach http://www.wettermail.de/wetter/feuchte.html $temperatur = 5; $relfeuchte = 85; //Taupunktberechnung in °C function Taupunkt($temperatur,$relfeuchte) { $val = (234.67*0.434292289*log(6.1*exp((7.45*$temperatur) /(234.67+$temperatur)*2.3025851)*$relfeuchte/100/6.1)) /(7.45-0.434292289*log(6.1*exp((7.45*$temperatur) /(234.67+$temperatur)*2.3025851)*$relfeuchte/100/6.1) ); return $val; } //Sättigungsdampfdruck in hPa function SaettigungsDampfDruck($temperatur) { if ($temperatur >= 0) { $a = 7.5; $b = 237.3; } elseif ($temperatur < 0) { $a = 7.6; $b = 240.7; } $val = (6.1078 * exp( log(10) * (($a * $temperatur) / ($b + $temperatur)) ) ); return $val; } //Dampfdruck in hPa function DampfDruck($temperatur,$relfeuchte) { $val = $relfeuchte/100 * SaettigungsDampfDruck($temperatur); return $val; } //absolute Feuchte in g/m³ function AbsoluteFeuchte($temperatur,$relfeuchte) { $tk = ($temperatur + 273.15); $val = (exp(log(10) * 5) * 18.016/8314.3 * DampfDruck($temperatur,$relfeuchte)/$tk); return $val; } $taupunkt = Taupunkt($temperatur,$relfeuchte); $sattdampfdruck = SaettigungsDampfDruck($temperatur); $dampfdruck = DampfDruck($temperatur,$relfeuchte); $absfeuchte = AbsoluteFeuchte($temperatur,$relfeuchte); echo $absfeuchte; ?>

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
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2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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