в 10:37, 26 мая 2010

2010-05-26T10:37:31Z

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2010-05-26T07:06:03Z

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==Create and use a simple static Math() class==



<source lang="html4strict">

<?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";
?>

</source>

==Hyperbolic Functions==



<source lang="html4strict">

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);
?>

</source>

==Math calculation==



<source lang="html4strict">

<?
$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
?>

</source>

==Mathematical constants==



<source lang="html4strict">

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)

</source>

==Math operations==



<source lang="html4strict">

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

</source>

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в 10:37, 26 мая 2010

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