PHP

  <?php $a = 3 ; $b = 10 ; if ( $a < $b ) {     echo "A is Smaller<br>" ; } //Another Syntax for if statement if ( $a < $b ):     echo "A is Smaller than B<br>" ; endif ; $c = 20 ; $d = 20 ; if ( $c == $d ) {     echo "C is Equal to D<br>" ; } $e = 30 ; $f = "30" ; if ( $e == $f ) {     echo "e is Equal to f<br>" ; } if ( $e === $f ) {     echo "e is Not Equal to f<br>" ; } ? >

  <?php $a = 10 ; $b = 10 ; $c = 20 ; $d = "10" ; echo $a == $b ; echo "<br>" ; echo $a == $c ; echo "<br>" ; echo $a === $b ; echo "<br>" ; echo $a === $c ; echo "<br>" ; echo $a == $d ; echo "<br>" ; echo $a === $d ; echo "<br>" ; echo $a != $b ; echo "<br>" ; echo $a != $c ; //OR echo $a <> $b; echo "<br>" ; echo $a <> $c ; echo "<br>" ; echo $a !== $c ; echo "<br>" ; echo $a !== $b ; echo "<br>" ; echo $a !== $d ; echo "<br>" ; echo $a > $c ; echo "<br>" ; echo $a < $c ; echo "<br>" ; echo $a >= $c ; echo "<br>" ; echo $a <= $c ; echo "<br>" ; echo $a <=> $c ; echo "<br>" ; echo $a <=> $b ; ? >

  <?php $a = 10 ; $b = 5 ; // $a += $b; // echo $a."<br>"; // $a -= $b; // echo $a."<br>"; // $a *= $b; // echo $a."<br>"; // $a /= $b; // echo $a."<br>"; // $a %= $b; // echo $a; $a **= $b ; echo $a ; ? >

  <?php $a = 10 ; $b = 4 ; $c = $a + $b ; echo $c . "<br>" ; $d = $a - $b ; echo $d . "<br>" ; $e = $a * $b ; echo $e . "<br>" ; $f = $a / $b ; echo $f . "<br>" ; $g = $a % $b ; echo $g . "<br>" ; $h = $a ** $b ; echo $h . "<br>" ; // $a++; // ++$a; // echo $a."<br>"; // $b--; // --$b; // echo $b."<br>"; $i = $a + $b * 2 ; echo $i . "<br>" ; $j = ( $a + $b ) * 2 ; echo $j . "<br>" ; ? >

  <?php define ( "test" , 50 ); echo test . "<br>" ; $sum = test + 20 ; echo $sum . "<br>" ; //Constant variable works as Normal Variable but we can't Re-assign OR Re-defined //value again to contant variable //Contant variables are case sensitive define ( "testOne" , 55 ); echo testOne . "<br>" ; define ( "_test" , 100 ); echo _test . "<br>" ; ? >

  <?php $x = "Hello World" ; //this is single line comment #this is also a single line comment echo $x ; /*$y = "Everyone"; echo $y;*/ ? >

  <?php $x = "Hello World" ; echo $x . "<br>" ; var_dump ( $x ); echo "<br><br>" ; $y = 2500 ; echo $y . "<br>" ; var_dump ( $y ); echo "<br><br>" ; $z = "2500" ; echo $z . "<br>" ; var_dump ( $z ); echo "<br><br>" ; $a = 2500.50 ; echo $a . "<br>" ; var_dump ( $a ); echo "<br><br>" ; $b = true ; echo $b . "<br>" ; var_dump ( $b ); echo "<br><br>" ; $c = array ( "HTML" , "CSS" , "JavaScript" ); print_r ( $c ); var_dump ( $c ); echo "<br><br>" ; $d = null ; echo $d ; var_dump ( $d ); ? >

  <?php $name = "Hello World<br>" ; echo $name ; echo $name ; echo $name ; echo "<h1>" . $name . "</h1>" ; echo "Hello How are you : " . $name ; $num = 2369 ; echo $num ; ? >

  <?php echo "Hello World<br>" ; echo 'HELLO WORLD<br>' ; echo ( "Hello" ) . "<br>" ; echo "Hello" , " World" . "<br>" ; echo "<b>Hello" . "World</b>" ; echo "<h1><i>Hello" . "World</i></h1><br>" ; echo 2368 ; print "<h1><i>Hello" . "World</i></h1><br>" ; print 2368 ; ? >

  <?php     echo "Hello World<br>" ; ? > < html >     < head >         < title > PHP </ title >     </ head >     < body >         <?php             echo "Hello Everyone" ;         ? >     </ body > </ html >