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Calculate logarithms by dividing log() function with log(base)

<?php  $val = 100;  $i = log($val);  echo "log($val) = $i\n";  $i10 = log($val) / log(10);  echo "log($val) / log(10) = $i10\n";  $i10 = log10($val);  echo "log10($val) = $i10\n";  ?>