expm1(): equivalent to 'exp(num) - 1'
Calculate exp(x) - 1 accurately
expm1() calculates exp($x) - 1 with better numerical accuracy when the input is close to zero.
$x = 0.000001;
echo expm1($x);
Use expm1() instead of exp($x) - 1 when $x is very close to zero, where subtracting nearly equal values can lose precision.
<?Php
echo expm1(5); // Output 147.41315910258
echo "<br>";
echo expm1(1); // Output 1.718281828459
echo "<br>";
echo expm1(0); // Output is 0
echo "<br>";
echo expm1(-1); // Output is -0.63212055882856
echo "<br>";
?>
float expm1(float $num)$num is the exponent. The function returns exp($num) - 1.
Math Functions LOG() function
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