sqrt

(PHP 4, PHP 5, PHP 7, PHP 8)

sqrt — Square root

Açıklama

sqrt(float $num): float

Returns the square root of num.

Bağımsız Değişkenler

num: The argument to process

Dönen Değerler

The square root of num or the special value NAN for negative numbers.

Örnekler

Örnek 1 sqrt() example

<?php
// Precision depends on your precision directive
echo sqrt(9); // 3
echo sqrt(10); // 3.16227766 ...
?>

Ayrıca Bakınız

pow() - Exponential expression
M_SQRTPI - sqrt(pi)
M_2_SQRTPI - 2/sqrt(pi)
M_SQRT2 - sqrt(2)
M_SQRT3 - sqrt(3)
M_SQRT1_2 - 1/sqrt(2)

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User Contributed Notes 1 note

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landavia81 at gmail dot com ¶

2 days ago

if you want a custom square root. Use pow() or powLogExp function (custom). 

example:
100 root 3. In math is same as 1 divide with 3 (important)
<?php
$root = 1/3; 
echo pow(1000, $root);
echo powLogExp(1000, $root);

function powLogExp($num1, $num2){
    $num3 = log($num1) * $num2;
    return exp($num3);
}
?>
With this, you might using more complex 'root'
reference: counting math using log

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