Most Referenced Functions
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  » fopen()
  » header()
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  » ob_flush()
  » strstr()
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  » str_replace()
  » array2vars()
  » nl2br()
  » preg_split()
  » ereg()
  » ereg_replace()
  » urlencode()
  » readgzfile()

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PHP Functions

Function: log

(PHP 3, PHP 4, PHP 5)

log -- Natural logarithm

Description

float log ( float arg [, float base] )

If the optional base parameter is specified, log() returns log base arg , otherwise log() returns the natural logarithm of arg .

Note: The base parameter became available with PHP 4.3.0.

As always you can calculate the logarithm in base b of a number n , but using the mathematical identity: log b (n) = log(n)/log(b), where log is the neperian (or natural) logarithm.

Related Function(s)

  • exp()
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