mathFunc

<?php

/*
 * Create an operation which will behave as the following
 * set of functions (without using "if" statements):
 * 
 * f(x) = 0,      for x < 0;
 * f(x) = x,      for x >= 0 and x < 1;
 * f(x) = 1,      for x >= 1 and x < 2;
 * f(x) = -x + 3, for x >=2 and x < 3;
 * f(x) = 0,      for x >= 3;
 * 
 */

function f($x)
{
    $constZero = !($x < 0 || $x >= 3);
    
    $ascendingFunction = ($x >= 0 && $x < 1);
    
    $constValue = ($x >= 1 && $x < 2);
    
    $descendingFunction = ($x >= 2 && $x < 3);
    
    return $constZero * ($ascendingFunction*$x + $constValue*1 + $descendingFunction*(-$x + 3));
}

sweeeet! Now it seems so trivial...