Else If Condition | php | Replace | Revert | implode | explode | Count | String | Web Devlopment

$age = 18;
$country = 'BD';

// If - else
if($age==18){
     echo 'You are Just Eligible';
}
elseif(age>=18){
     echo 'You are Eligible';
}
else{
     echo 'You are Not Eligible';
}


// Nested If - Else

if($country=='BD'){
    if($age==18){
         echo 'You are Just Eligible';
      }
     else{
          echo 'You are Not Eligible';
      }
}

else{

         echo 'You are Not From BD;

}

// Double Condition inside a If using and( && ) , Or ( || ).

1.

if($age=='18' and $country=='BD'){

     echo 'Allowed'; 

}

else{

     echo 'Not Allowed'; 

}

2.

if($age=='18' || $country=='BD'){

     echo 'Allowed'; 

}

else{

     echo 'Not Allowed'; 

}

// Grater then Or Less then Condition  

if($age>=18 and $age<=25){
     echo 'You are Just Eligible';
}
else{
     echo 'You are Not Eligible';

} 

Shortcut if else in one line

echo ($age == 18 ? "Eligible ": "Not Eligible" );

here $age == 18 ? "Eligible " means:

    if($age ==18){

         echo 'Eligible';

     }

And : "Not Eligible" means:

     else{

          echo 'Not Eligible';          

      }

Nested Shortcut if else in one line

echo ($age == 18 ? $country == "BD" ? "Eligible ": "Not Eligible" );

//Switch Case

 Switch($country){

       case 'NZ ':

          echo 'Not Permitted ';

       break;

       case 'IND':

          echo 'Not Permitted ';

       break;

       case 'BD':

          echo 'Permitted ';

       break

    

        default:

           echo 'Enter a Valid value';    

         break;

}

// str_replace