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/* Integers and floats 
   Integers hold whole numbers, while floats hold fractions */

//no doble quotes

   <?php
    $one = 1;
    $two = 2;
    $three = 3;
    $string_one = "1";
    ?>

    <ul>
    <li><?php echo $one ?></li>
    <li><?php echo gettype($one) ?></li> //get type integer
    <li><?php echo $string_one ?></li>
    <li><?php echo gettype($string_one) ?></li>// get type string
    </ul>


//add two integers and substract
<?php 

echo $one + $two - $three;

?>


//floats

    <?php
    $distance_to_home = 1.2;
    $distance_to_work = 2.5;
    ?>


<?php 

echo $distance_to_home + $distance_to_work + $three;

?>

/* Booleans 
   true or false - to define a boolean use the keyword true or false 
   true  = anything that is non 0 value is considered true 
   false = 0 value and empty string    */

     <?php
    $bool = TRUE;
    var_dumo($bool); //dumb print bool(true)
    $bool = FALSE;
    var_dumo($bool); //dumb print bool(false)
    ?>

//typecast to see if is true or false 

 <?php
    var_dumo((bool)""); // empty string - all false
    var_dumo((bool) 0); // 
    var_dumo((bool) 0.0);//
    var_dumo((bool) array()); // empty array
    ?>

// all report back as bool(false)

 <?php
    var_dumo((bool)"abc"); // string - all true
    var_dumo((bool) 1); // 
    var_dumo((bool) 1.0);//
    var_dumo((bool) -1); // 
    ?>


// all report back as bool(true)  

/* Strings  
   display text  \n is a brake <br> */




   <?php
    $greeting = "Hello, friends: \n";
    $greeting(0) = "j";
    $secondary_greeting = "How are you";
    ?>


    <?php 
    echo $greeting;  // with j = Jello, friends

    echo $greeting(0); // first character of Hello - H

    echo $greeting(1); // second character of Hello - e

    echo $secondary_greeting;  // eco secondary greeting

     ?>

/* 7 Data Types on php  - ways to hold data 

   Integers  = hold whole numbers
   floats    = fractional numbers 0.2
   string    = letters and sentences
   arrays    = store multiple data types in an organize way
   booleans  = to define objects true or false
   objects   = complex variables (they are the base of object oriented php)
   resources = anything that is not php data - files response for database queries
   */