PHP Conditional Statements

PHP Conditional Statements
  • Conditional statements are used to perform different actions based on conditions.
  • In PHP the following conditional statements is given below.
  • PHP if statement
  • PHP if....else statement
  • PHP if...elseif...else statement
  • PHP switch statement
PHP if statement
  • PHP if statement is used to conditional output of code. It is executed if condition is true.
  • syntax

    • if (condition) {
    //write a code to be executed
    }

  • example
    • <!DOCTYPE html>
<html>
<body>

<?php
$a=24;
$b=50;
if ($a < $b) {
echo "a is less than b";
}
?>

</body>
</html>
PHP if...else statement
  • If you want to output some code if a condition is true and another code if a condition is false, use the if....else statement.
  • syntax

    • if (condition) {
    //write a code to be executed
    }else {
    //write a code to be executed
    }

  • example
    • <!DOCTYPE html>
<html>
<body>
<?php
$age = 20;
if ($age > "18") {
echo "you are eligible for voting";
} else {
echo "you not are eligible for voting";
}
?>
</body>
</html>
PHP if...elseif...else statement
  • If you want to output some code if one of the several conditions are true use the elseif statement
  • syntax

    • if (condition) {
    //code to be executed if condition 1 is true
    } elseif (condition) {
    //code to be executed if condition 2 is true
    } else {
    //code to be executed if all given conditions are false
    }

  • example
    • <!DOCTYPE html>
<html>
<body>
<?php
$no = 10;
if ($no > "0") {
echo "Positive number";
}
else if($no == "0"){
echo "Number is zero";
}
else {
echo "Negative number";
}
?>
</body>
</html>
PHP nested if Statement
  • The nested if statement contains the if block inside another if block.
  • The inner if statement executes only when a specified condition in outer if a statement is true, then the inner condition executes.
  • syntax

    • if (condition)
    {
    if (condition) {
    //write a code to be executed
    }
    else {
    //write a code to be executed
    }
    }

  • example
    • <!DOCTYPE html>
<html>
<body>

<?php
$age = 20;
$nationality = "Indian";
if ($nationality == "Indian")
{
if ($age > "18") {
echo "you are eligible for voting";
} else {
echo "you are not eligible for voting";
}
}
else{
echo "Nationality is not indian";
}
?>

</body>
</html>
PHP switch statement
  • PHP switch statement is in details in next page.
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