Challenge 1 — Solution

Task: Create three variables: $firstName (string), $age (int), and
$heightInMeters (float). Use var_dump() on each one to confirm PHP
correctly identified each type, then echo a sentence combining all
three using string interpolation.

<?php
    $firstName = "Philip";
    $age = 35;
    $heightInMeters = 1.8;

    var_dump($firstName);
    var_dump($age);
    var_dump($heightInMeters);

    echo "$firstName is $age years old and $heightInMeters metres tall.";
?>


Output:
string(6) "Philip"
int(35)
float(1.8)
Philip is 35 years old and 1.8 metres tall.

Notes:
- var_dump() confirms each variable's real type: string(6) means a
  6-character string, int(35) a plain integer, float(1.8) a
  floating-point number.
- No type had to be declared anywhere — PHP inferred each one purely
  from the value assigned to it.
- The final echo interpolates all three variables directly inside one
  double-quoted string, with no manual concatenation needed.