PHP/Math/Math

Материал из Web эксперт
Перейти к: навигация, поиск

Create and use a simple static Math() class

 
<?php 
define("RAND_MAX", mt_getrandmax()); 
class Math { 
    static $pi = M_PI; 
    static $e = M_E; 
    static function pi() { 
        return M_PI; 
    } 
    static function intval($val) { 
        return intval($val); 
    } 
    static function floor($val) { 
        return floor($val); 
    } 
    static function ceil($val) { 
        return ceil($val); 
    } 
    static function round($val, $decimals = 0) { 
        return round($val, $decimals); 
    } 
    static function abs($val) { 
        return abs($val); 
    } 
    static function floatval($val) { 
        return floatval($val); 
    } 
    static function rand($min = 0, $max = RAND_MAX) { 
        return mt_rand($min, $max); 
    } 
    static function min($var1, $var2) { 
        return min($var1, $var2); 
    } 
    static function max($var1, $var2) { 
        return max($var1, $var2); 
    } 
} 
$a = 3.5; 

echo "Math::\$pi = " . Math::$pi . "\n"; 
echo "Math::\$e = " . Math::$e . "\n"; 
echo "Math::intval($a) = " . Math::intval($a) . "\n"; 
echo "Math::floor($a) = " . Math::floor($a) . "\n"; 
echo "Math::ceil($a) = " . Math::ceil($a) . "\n"; 
echo "Math::round(Math::\$pi, 2) = " . Math::round(Math::$pi, 2) . "\n"; 
echo "Math::abs(-$a) = " . Math::abs(-$a) . "\n"; 
echo "Math::floatval($a) = " . Math::floatval($a) . "\n"; 
echo "Math::rand(5, 25) = " . Math::rand(5, 25) . "\n"; 
echo "Math::rand() = " . Math::rand() . "\n"; 
echo "Math::min(2, 28) = " . Math::min(3, 28) . "\n"; 
echo "Math::max(3, 28) = " . Math::max(3, 28) . "\n"; 
?>



Hyperbolic Functions

 
Name           Description 
cosh()         Hyperbolic cosine (exp(arg) + exp(-arg))/2 
sinh()         Hyperbolic sine (exp(arg) - exp(-arg))/2 
tanh()         Hyperbolic tangent sinh(arg)/cosh(arg) 
acosh()        Inverse hyperbolic cosine 
asinh()        Inverse hyperbolic sine 
atanh()        Inverse hyperbolic tangent 
<?php 
$start = array(0, 0); 
$end = array(100, 0); 
$length = sqrt(pow($end[0] - $start[0], 2) + pow($end[1] - $start[1], 2)); 
$angle = 35; 
$r = deg2rad($angle); 
$new_start = array(20, 20); 
$new_end = array( $new_start[0] + cos($r) * $length, $new_start[1] + sin($r) * $length 
); 
var_dump($new_end); 
?>



Math calculation

 
<?
    $somevar = 5 + 5; // 10
    $somevar = 5 - 5; // 0
    $somevar = 5 + 5 - (5 + 5); // 0
    $somevar = 5 * 5; // 25
    $somevar = 10 * 5 - 5; // 45
    $somevar = $somevar . "appended to end";
    $somevar = false;
    $somevar = !$somevar; // $somevar is now set to true
    $somevar = 5;
    $somevar++; // $somevar is now 6
    $somevar--; // $somevar is now 5 again
    ++$somevar; // $somevar is 6
?>



Mathematical constants

 
Constant                    Value                                 Meaning
 
M_PI                        3.14159265358979323846                pi
 
M_PI_2                      1.57079632679489661923                pi/2
 
M_PI_4                      0.78539816339744830962                pi/4
 
M_1_PI                      0.31830988618379067154                1/pi
 
M_2_PI                      0.63661977236758134308                2/pi
 
M_SQRTPI                    1.77245385090551602729                sqrt(M_PI)
 
M_2_SQRTPI                  1.12837916709551257390                2/sqrt(M_PI)
 
M_SQRT2                     1.41421356237309504880                sqrt(2)
 
M_SQRT3                     1.73205080756887729352                sqrt(3)
 
M_SQRT1_2                   0.70710678118654752440                1/sqrt(2)



Math operations

 
<?
print 2 + 2;
print 17 - 3.5;
print 10 / 3;
print 6 * 9;
?>