Introduction To Data Type

<?php

  /*
  ============================================
  = Data Types
  = ----------
  = bool  => Boolean
  = int   => Integer
  = float => Floating Point Number | double
  = string
  = array
  = Other Types
  = gettype()
  ============================================
  */

  echo gettype(True);
  echo '<br>';
  echo gettype(False);
  echo '<br>';
  echo gettype(true);
  echo '<br>';
  echo gettype(100);
  echo '<br>';
  echo gettype(-200);
  echo '<br>';
  echo gettype(0);
  echo '<br>';
  echo gettype(70.30);
  echo '<br>';
  echo gettype(-60.30);
  echo '<br>';
  echo gettype('Elzero');
  echo '<br>';
  echo gettype("Elzero");
  echo '<br>';
  echo gettype(array("EG" => "Egypt", "KSA" => "Saudi Arabia"));
  echo '<br>';
  echo gettype(array("Egypt", "Saudi Arabia"));
  echo '<br>';
  echo gettype(["Egypt", "Saudi Arabia"]);