php basic

echo 'waqas</br>';

           

   //variables

$txt = '<b>waqas khan</b>';

$numb = 134;

echo $txt.' '.'<u>'.$numb .'</u></br>';

           

            //if/ if else ststment

$a = 2;

$b = 3;

                 //if statment

     if ($a!=$b) {

 echo 'true </br>';

}

       

        //if else statment

$a1 = 3;

$b1 = 10;

      if($b1<=$a1) {

    echo 'true </br>';

    } else {

echo 'false </br>';

}

           //if/else if statment

 $a2 = 8;

         if($a2==10) {

echo 'equal to 10';

} else if ($a2==5) {

            echo 'equal to 5';

           } else  {

            echo 'not equal! </br>';

        }

                 //assignment operetors

     // -=, +=, %=, *=

$b2 = 5;

$b2 += 3;

echo $b2.'</br>';

 $nam = '<b>hammad</b>';

$nam .= ' ali';

  echo $nam.'</br>';

//comparision operators
  // ==, >, <, >=, <=, !=, <>

if(1<>2) {
echo 'true </br>';
}
if(1!=2) {
 echo 'true </br>';
} 
                  
   //arithmetic operators
 // +, -, *, /, %, ++, --
 
$sum = 3+4;  
echo $sum.'</br>';


$a3 = 10;
$b3 = 2;
$c1 = 4;
$result = ($a3 - $b3) / $c1;  
echo $result.'</br>';  
 
$c2 = 4;
$c2++;
echo $c2.'</br>';  
 
//logical operators
                      // &&, or, !,


$c3 = 5; 

if ($c3>=4 && $c3<=4) {
      echo 'true';
 } else {
 echo 'false </br>';
 }


$a4 = 4;
     if($a4==4 or $a4==3) {
echo 'true </br>'; 
} else {
echo 'false';
}


$b4 = 5;
      if  (!($b4==5) && ($b4==5)) {
echo 'true';
        } else {
echo 'false </br>';
}


           //triple equals
             // ===,
$string = '1';
$integer = 1;
          if($string===$integer) {
 echo 'equal';
 } else {
 echo 'not equal </br>';
 }


                  //while loop
$c4 = 1;
while ($c4<=10) {
  echo $c4.' WAQAS</br>';
  $c4++;
  }


$a5 = 10;
      while ($a5>=1) {
 echo $a5.' KHAN</br>';
 $a5--;
 }


                    //do while loop
$b5 =1;
      do {
 echo ' Show';
 $b5++;
 } while ($b5<=3)

do {
echo 'Show</br>';
} 
while (0)

//for loop
for($c5=10; $c5>=1; $c5--) {
echo $c5.' ';
}

for($a6=1; $a6<=10; $a6++) {
echo $a6.' ';
}

//switch statement
$b6 = 1;
switch($b6) {
case 1:
echo 'One</br>';
break;

case 2:
echo 'Two';
break;

case 3:
echo 'Three';
break;

default:
echo 'number not found</br>';
break;
}

//Another switch statement
$c5 = 'black';
switch($c5) {
case 'red':
case 'yellow':
case 'green':
echo 'Traffic ligth color</br>';
break;

default:
echo 'Not a traffic ligth color</br>';
break;
}
 
//Array $a7 = array('waqas', 'wahab', 'waleed'); $a7[3] = 'hammad'; print_r($a7); //echo $a7[1].'</br>'; //Associative array $b7 = array('waqas'=>26, 'wahab'=>18, 'waleed'=>22); print_r($b7); //echo $b7['wahab']; //Multi-dimensional arrays $c7 = array('friends'=> array('waleed', 'hammad', 'ali'), 'gfz'=> array('popo', 'mam', 'no one')); echo $c7['gfz'][0]; //for each statement $a8 = array('friends'=> array('waleed', 'hammad', 'ali'), 'gfz'=> array('popo', 'mam', 'no one')); foreach($a8 as $element => $inner_array) { echo '<u><b>'.$element.'</u></b></br>'; foreach($inner_array as $items) { echo $items.'</br>'; } }  
//die and exit functions
//keywords: "die();" & "exit();"

@mysql_connect('localhost'.'root'.'') or die('Not connected');
echo 'Connected!';