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Calculate logarithms with other base values by dividing the result of the 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"; ?>