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);
This is the recommended starting pattern. The detailed examples below are retained and modernized for additional variations and explanation.
<?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 X);
Math Functions LOG() function
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