PHP tutorial-Conditional Statements

PHP Conditional Statements



If…Else statement


If statement will check the condition. If it is true, it will execute the statement(s) that follows it. Otherwise, it will execute the statement(s) in else block.


if (condition) {
  Statement1;
  Statement2;
}
or
 
if (condition) {
 
  Statement1;
  Statement2;
}
else {
  Statement1;
  Statement2;

}


Example:
 
<html>
<body>
 
<?php
  $x=10;
  if($x%2==0) {echo "x is an even number";}
  else {echo "x is an odd number";}
 
?>
 
</body>
</html>
 

If ..elseif statement


If…elseif statement is used to check multiple conditions.


if (condition) {
 
  Statement1;
  Statement2;
}
elseif {
  Statement1;
  Statement2;

}
or
 
if (condition) {
 
  Statement1;
  Statement2;
}
elseif {
  Statement1
  Statement2

}
 
else {
  Statement1;
  Statement2;
}
 
Example:
<html>
<body>
 
<?php
  $x=rand(1,3);
  if($x==1) {echo "x=1";}
  elseif($x==2) {echo "x=2";}
  else { echo "x=3";}
?>
 
</body>
</html>
 

switch case statement


switch case statement is used to test multiple choices. Each case of the switch statement should end with the break statement. By using the break keyword, the process will stop when a case is true. If you want to do something when the all cases are not met, you will place the code in the default section.
 
switch(variable){
   case va1:statement;break;
   case val2:statement;break;
   case val3:statement;break;
…………………………
default:statement;
 
}
 
Example:
<html>
<body>
 
<?php
  $x=rand(1,3);
   switch($x){
      case 1:echo "x=1";break;
      case 2:echo "x=2";break;
      case 3:echo "x=3";break;
      default:echo "Invalid value";
        }
?>
 
</body>
</html>






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