gistfile1.php

<?php 

function is_true($val) {
  return $val ? "true" : "false";
}

$a = 1;
$a_test = is_true($a);
echo "(a) integer : $a_test \n";
// returns: (a) integer : true 

$b;
$b_test = is_true($b);
echo "(b) empty declaration : $b_test \n";
// returns: (b) empty declaration : false 

$c = "1";
$c_test = is_true($c);
echo "(c) string : $c_test \n";
// returns: (c) string : true 

$d = "";
$d_test = is_true($d);
echo "(d) empty string : $d_test \n";
// returns: (d) empty string : false 

$e = array(1);
$e_test = is_true($e);
echo "(e) array with integer : $e_test \n";
// returns: (e) array with integer : true 

$f = array("1");
$f_test = is_true($f);
echo "(f) array with string : $f_test \n";
// returns: (f) array with string : true 

$g = array();
$g_test = is_true($g);
echo "(g) empty array : $g_test \n";
// returns: (g) empty array : false 

$h = (object) array();
$h_test = is_true($h);
echo "(h) empty object : $h_test \n";
// returns: (h) empty object : true 

$i = (object) array("test"=>true);
$i_test = is_true($i);
echo "(i) simple object : $i_test \n";
// returns: (i) simple object : true 

?>