PHP While Loop 

 PHP While Loop:  
 While loop starts and ends with opening and closing backers respectively, while condition needs to be declared on first position.   
 <body>  
 <?php   
 $y = 2;  
 while($y <= 21) {  
  echo "This is table of two : $y <br>";  
  $y= $y+2;  
 }  
 ?>  
 </body>  
 Output:  
 This is table of two : 2   
 This is table of two : 4   
 This is table of two : 6   
 This is table of two : 8   
 This is table of two : 10   
 This is table of two : 12   
 This is table of two : 14   
 This is table of two : 16   
 This is table of two : 18   
 This is table of two : 20

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