PHP log10()用法及代碼示例

log10() 函數是預定義的 php 數學函數。它用於返回一個數字的以 10 為底的對數。

用法:

log10(num);

參數	描述	必需/可選
Number	指定計算對數的值。	Required

<?php
$num=5;
echo "Your number is:".$num;
echo "<br>"."By using log10() function your number is:".log($num);
?>

輸出：

Your number is:5
By using log10() function your number is:1.6094379124341

<?php
$num=1.234;
echo "Your number is:".$num;
echo "<br>"."By using log10() function your number is:".log($num);
?>

輸出：

Your number is:1.234
By using log10() function your number is:0.2102609254832

<?php
$num=1;
echo "Your number is:".$num;
echo "<br>"."By using log10() function your number is:".log($num);
?>

輸出：

Your number is:1
By using log10() function your number is:0

<?php
$num=0;
echo "Your number is:".$num;
echo "<br>"."By using log10() function your number is:".log($num);
?>

輸出：

Your number is:0
By using log10() function your number is:-INF

<?php
$num=-1;
echo "Your number is:".$num;
echo "<br>"."By using log10() function your number is:".log($num);
?>

輸出：

Your number is:-1
By using log10() function your number is:NAN

相關用法

注：本文由純淨天空篩選整理自 PHP log10() Function。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。