PHP Programing task 3

//1
<?php

$a = "5";

$result = (boolval($a) ? 'true' : 'false' );

echo "$result <br>";

$b = "";
$test = (boolval($b) ? 'true' : 'false');
echo "$test <br>";


?>

//2
<?php

$a = "123.456";
echo doubleval($a)."<br>";

$b = "123.456asgfgsda";
echo doubleval($b)."<br>";

$c = "vbfg123.456";
echo doubleval($c)."<br>";

$d = "987vbfg123.456";
echo doubleval($d)."<br>";

?>

//3
<?php

$a = "";

echo empty($a)."<br>";

$b = "2";

echo isset($b);

?>

//4
<?php


$a = "1234.56789";
echo floatval($a) . "<br>";

$b = "1234.56789Hello";
echo floatval($b) . "<br>";

$c = "Hello1234.56789";
echo floatval($c) . "<br>";

?>

//5
<?php

$a = 3;
echo gettype($a) . "<br>";

$b = 3.2;
echo gettype($b) . "<br>";

$c = "Hello";
echo gettype($c) . "<br>";

$d = array();
echo gettype($d) . "<br>";

$e = array("red", "green", "blue");
echo gettype($e) . "<br>";

$f = NULL;
echo gettype($f) . "<br>";

$g = false;
echo gettype($g) . "<br>";

// $data = array(1, 1., NULL, new stdClass, 'foo');

// foreach ($data as $value) {
//     echo gettype($value), "<br>";
// }

?>

//6
<?php
$a = 32;
echo intval($a) . "<br>";

$b = 3.2;
echo intval($b) . "<br>";

$c = "32.5";
echo intval($c) . "<br>";

$d = array();
echo intval($d) . "<br>";

$e = array("red", "green", "blue");
echo intval($e) . "<br>";
?>

//7
<?php
$a = "Hello";
echo "a is " . is_array($a) . "<br>";

$b = array("red", "green", "blue");
echo "b is " . is_array($b) . "<br>";

$c = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
echo "c is " . is_array($c) . "<br>";

$d = "red, green, blue";
echo "d is " . is_array($d) . "<br>";

$e = array();
echo "e is " . is_array($e) . "<br>";
?>


//8
<?php
$a = 1;
echo "a is " . is_bool($a) . "<br>";

$b = 0;
echo "b is " . is_bool($b) . "<br>";

$c = true;
echo "c is " . is_bool($c) . "<br>";

$d = false;
echo "d is " . is_bool($d) . "<br>";
?>

//9
<?php
// $a = 32;
// echo "a is " . is_float($a) . "<br>";

// $b = 0;
// echo "b is " . is_float($b) . "<br>";

// $c = 32.5;
// echo "c is " . is_float($c) . "<br>";

// $d = "32";
// echo "d is " . is_float($d) . "<br>";

// $e = true;
// echo "e is " . is_float($e) . "<br>";

// $f = "null";
// echo "f is " . is_float($f) . "<br>";

// $g = 1.e3;
// echo "g is " . is_float($g) . "<br>";

var_dump(is_float(27.25));
var_dump(is_float('abc'));
var_dump(is_float(23));
var_dump(is_float(23.5));
var_dump(is_float(1e7));
var_dump(is_float(true));

?>

// 10

<?php

$a = 0;
echo "a is " . is_null($a) . "<br>";

$b = null;
echo "b is " . is_null($b) . "<br>";

$c = "null";
echo "c is " . is_null($c) . "<br>";

$d = NULL;
echo "d is " . is_null($d) . "<br>";

?>

//11

<?php
$a = 32;
echo "a is " . is_numeric($a) . "<br>";

$b = 0;
echo "b is " . is_numeric($b) . "<br>";

$c = 32.5;
echo "c is " . is_numeric($c) . "<br>";

$d = "32";
echo "d is " . is_numeric($d) . "<br>";

$e = true;
echo "e is " . is_numeric($e) . "<br>";

$f = null;
echo "f is " . is_numeric($f) . "<br>";
?>

// 12
<?php

$a = "Hello";
echo "a is " . is_string($a) . "<br>";

$b = 0;
echo "b is " . is_string($b) . "<br>";

$c = 32;
echo "c is " . is_string($c) . "<br>";

$d = "32";
echo "d is " . is_string($d) . "<br>";

$e = true;
echo "e is " . is_string($e) . "<br>";

$f = "null";
echo "f is " . is_string($f) . "<br>";

$g = "";
echo "g is " . is_string($g) . "<br>";

?>

// 13

<?php
$a = 0;

if (isset($a)) {
  echo "Variable 'a' is set.<br>";
}

$b = null;

if (isset($b)) {
  echo "Variable 'b' is set.";
}
?>

//14
<?php
$a = "32"; // string
settype($a, "integer"); // $a is now integer
echo var_dump($a)."<br>";

$b = 32; // integer
settype($b, "string"); // $b is now string
echo var_dump($b)."<br>";

$c = true; // boolean
settype($c, "string"); // $c is now integer (1)
echo var_dump($c)."<br>";
?>