Wu Yuxiong - born natural development of learning PHP: echo and print statements

? < PHP
 echo "<h2> PHP is fun </ h2>!" ;
 Echo "! <br> the Hello world" ;
 echo "<br> I want to learn PHP!" ;
 Echo "This is a" "string "," use "and" more, "" parameters. " ;
 ?>

? < PHP
 $ txt1 = "Learning PHP" ;
 $ txt2 = "RUNOOB.COM" ;
 $ cars = Array ( "Volvo", "BMW", "Toyota" ); 

echo  $ txt1 ;
 echo "<br>" ;
 echo "in the $ txt2 learning PHP" ;
 echo "<br>" ;
 echo "my car brand is { $ cars [0]}" ;
 ?>

<? PHP
 Print "<h2> PHP is fun </ h2>!" ;
 Print "! <br> the Hello world" ;
 Print "I want to learn PHP!" ;
 ?>

? < PHP
 $ txt1 = "Learning PHP" ;
 $ txt2 = "RUNOOB.COM" ;
 $ cars = Array ( "Volvo", "BMW", "Toyota" ); 

Print  $ txt1 ;
 Print "<br>" ;
 Print "in the $ txt2 learning PHP" ;
 Print "<br>" ;
 Print "my car brand is { $ cars [0]}" ;
 ?>