# php sigmoid function

function sigmoid($t){ return 1 / (1 + exp(-$t)); }

**Here is what the above code is Doing:**

1. We’re defining a function called sigmoid that takes in a number t and returns the value of the sigmoid function applied to t.

2. We’re using the built-in exp function to calculate the exponential of t.

3. We’re using the built-in exp function to calculate the exponential of -t.

4. We’re dividing 1 by the sum of 1 and the exponential of -t.