PHP PART- 1 Code  -:

<?php 

/*

//operators 

//1. assignment operators

$var1 = 12;

echo $var1 . '<br>';

//2.increment operator

//prefix 

$var2 = ++$var1;  //12+1

echo $var2 . "<br>"; //13

//postfix

$var3 = $var1++; //13

echo $var3 . '<br>';  

echo 'var1 = '.$var1; //14

//3.decrement operator

$var1--; //13

echo '<br>'.$var1 .'<br>';

--$var1; //12

echo $var1 .'<br>';

//concatenation operator

$str = 'master-tech';

$str2 = '786';

$str3 = $str.$str2;

echo '<br>'. $str .'<br>'.$str3;

//==  (data)

$f = 12; //integer

$s = '12'; //string

if($f==$s) {

echo '<br>' . 'same data but not say about type';

}

//=== (type + data)

if($f===$s) {

echo '<br>' . 'same data with type';

}

else{

echo '<br>' . 'Not same data with type';

}

//addition

$var = 1;

$var123 = 2;

$var321 = $var+$var123;

$vars = $var-$var123; //sub

$varm = $var*$var123; //mul

$vard = $var/$var123; //div

 echo '<br>' . $var321;

 echo '<br>' . $vars;

 echo '<br>' . $varm;

 echo '<br>' . $vard;*/

 //if else ladder

/* $var = '12';

 $var2 = 12;

 if($var==$var2) {

  echo '<br> if';

 }

 else if($var===$var2){

  echo '<br> f else if';

 }

else if($var!=$var2) {

echo '<br> s else if';

 } 

 else{

  echo '<br>  else ';

 }

*/

//for loop

 // 2 upto 10 table

/* for($t = 1; $t<=10; $t++) {

  echo '2 * '.$t.' = '. $t*2 . '<br>';

 }*/

 //while

/* $w = 1;

 while($w <= 10) {

  echo '2 * '.$w.' = '. $w*2 . '<br>';

  $w++;

 }*/

 //do - while

/* $d = 1;

 do {

  echo '2 * '.$d.' = '. $d*2 . '<br>';

  $d++;

 }while($d<=10);

*/

/* //ARRAY 1

 $arr = array(10, 'str', '12.5'); //1

 $arr1 = array('a'=>10, 'str', '12.5'); //1

 echo $arr1['a'] . '<br>';

 print_r($arr1);*/

 //ARRAY 1

/* $arr = [10, 'str', '12.5']; //1

 $arr1 = ['a'=>10, 'str', '12.5', 'hello']; //1

 echo $arr1['a'] . '<br>';

 print_r($arr1);

 foreach($arr1 as $var) {

  echo $var . '<br>';

 }*/

//function 

/* $n = "Mohd Umar";

 function sayName($name) {

  global $n;

  echo $name;

  return 'hello';

 }

$r = sayName($n);

echo '<br>'.$r;*/

/*header('location:header.php');*/

/*require_once('header.php');

require_once('header.php');

echo "Mohd Umar";

*/

// 2 dimensional array 

?>