sqrt

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

sqrt — Radice quadrata

Descrizione

sqrt(float $arg): float

Restituisce la radice quadrata di arg.

Example #1 Esempio di uso di sqrt()

<?php
// La precisione dipende dalle impostazioni delle direttive sulla precisione
echo sqrt(9); // 3
echo sqrt(10); // 3.16227766 ...
?>

Vedere anche pow().

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User Contributed Notes 1 note

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landavia81 at gmail dot com ¶

5 hours 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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