Question

How to calculate log10 (base-10 logarithm) in PHP

Answer 1

/*
float log10 ( float $arg )
*/

echo log10(123) . "<br />";
echo log10(1234) . "<br />";
echo log10(12345) . "<br />";
    
/*
run:

2.0899051114394
3.0913151596972
4.091491094268

*/

 

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Answer 2

/*
float log10 ( float $arg )
*/

echo number_format(log10(123), 2) . "<br />";
echo number_format(log10(1234), 2) . "<br />";
echo number_format(log10(1235), 2) . "<br />";
    
/*
run:

2.09
3.09
3.09

*/

 

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Answer 3

/*
float log10 ( float $arg )
*/

echo intval(log10(123)) . "<br />";
echo intval(log10(1234)) . "<br />";
echo intval(log10(12345)) . "<br />";
    
/*
run:

2
3
4

*/

 

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