Boolean, Arrays, null value in PHP Brief Description

Sample 1 : PHP Booleans Brief Description

Boolean can be either TRUE or False. i.e.
$x=true
$y=false
Simple Code to show of Boolean rule:
my name is "Noor"

Sample 2 : PHP Arrays Brief Description

An array is used to store multiple values in a single Variable.
Arrays are useful when you want to store a group of data.

array (size=3)
  0 => string 'sameeullahferoz' (length=15)
  1 => int 22
  2 => float 5.3

specific datatype in array.
My Height is 5.3

Sample 3 : null Values Variable in PHP

null

samee

 <html>  
      <head>  
           <title>Boolean, Arrays, null value Brief Description : 4th Day Lecture of PHP</title>  
      </head>  
      <body>  
           <h1 align="center">Boolean, Arrays, null value in PHP Brief Description</h1>  
                <h2 align="left">Sample 1 : PHP Boolean Brief Description</h2>  
                     <?php  
                          echo "Booleans can be either TRUE or False. i.e. <br />";  
                          echo '$x=true <br />';  
                          echo '$y=false <br />';  
                     ?>  
                     <?php echo "Simple Code to show of Boolean rule: <br />" ?>  
                     <?php  
                          $istrue = false;  
                          if($istrue)  
                               {  
                          echo "my name is \"Samee\"";  
                               } // if $istrue variable was true, then it will be run. otherwise never.  
                          else  
                               {  
                          echo "my name is \"Noor\""; #backslash is used to give output of double quotes.  
                               }  
                     ?>  
                <h2 align="left">Sample 2 : PHP Arrays Brief Description</h2>  
                     <?php  
                          echo "An array is used to store multiple values in a single Variable. <br />";  
                     ?>  
                          <!-- An Example of PHP Arrays -->
    <?php
     $bio=array("sameeullahferoz",22,5.3); //it is round braces not square bracket. 
     //In Array values are counted as 0, 1, 2, like it.
     var_dump($bio); //to show the types and values of arrays.
     echo "<br />";
     echo "specific datatype in array. <br />";
     echo "My Height is {$bio[2]}"; //it is used to call value from arrage
    ?>
    
   <h2 align="left">Sample 3 : null Values Variable in PHP</h2>
    <?php
    $name=null;
    var_dump($name);
    
    $name="samee";
    echo $name
    ?>
 </body>
</html>

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