PHP - log

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Metóda - log

(PHP 4, PHP 5, PHP 7)

The log() function returns the logarithm value. The basis for the logarithm is Euler's number (so the logarithm is natural, not decadic).

Procedurálne

• function log (float $arg, float $base = M_E) : float

Parametre

Názov	Dátový typ	Predvolená hodnota	Popis
$arg	float		A number.
$base	float	M_E	The base. M_E - The M_E constant has value of 2.718281828459

Mávratovej hodnoty

Vracia: float

The resulting number.

Príklady

<?php
for ($i = 0; $i < 10; $i++) {
    $x = rand(1, 20);
    $y = rand(1, 20);
    echo ("log ($x)$y= " . log($x, $y) . "<br />");
}