PHP log10()用法及代码示例

log10() 函数是预定义的 php 数学函数。它用于返回一个数字的以 10 为底的对数。

用法:

log10(num);

参数	描述	必需/可选
Number	指定计算对数的值。	Required

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

输出：

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);
?>

输出：

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);
?>

输出：

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);
?>

输出：

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);
?>

输出：

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

相关用法

注：本文由纯净天空筛选整理自 PHP log10() Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。