Question

How to use log10 function in PHP

Answer 1

$num = 175;

$len = floor(log10($num)) + 1;

echo $len;
 
 
 
 
/*
run:
 
3
 
*/

 

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Answer 2

echo log10(4) . "\n";

echo log10(3.14) . "\n";

echo log10(0) . "\n";

echo log10(1) . "\n";

 
 
 
/*
run:
 
0.60205999132796
0.49692964807321
-INF
0
 
*/

 

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