PHP Conditional Statements

PHP / Conditional Statements

Conditional statements in PHP are of 4 types
1. if statement.
2. if...else statement.
3. if...elseif...else statement.
4. Switch statement.

if Statement
It executes a block/ line/ lines of code if the condition is true.

Syntax
if (condition)
{
Executes block/ line/ lines of code if one condition is true.
}

Program	Output
<?php echo $Numberbigorsmall =( 9>5) ? "big" : "small"; ?>	big

if...else Statement in PHP
The if...else statement executes some code if a condition is true and another code if that condition is false.

Syntax
if (condition)
{
Executes block/ line/ lines of code if one condition is true.
}
else
{
Executes block/ line/ lines of code if one condition is true.
}

Program	Output
<?php $No1 = 10; $No2 = 5; if ($No1 > $No2) echo "No1 is big!"; else echo "No2 is big!"; ?>	No1 is big!

if...elseif...else Statement in PHP
It is used to execute different codes for more than 2 conditions.

Syntax
if (condition)
{
code to be executed if this condition is true;
} elseif (condition)
{
code to be executed if first condition is false and this condition is true;
}
else
{
code to be executed if all conditions are false;
}

Program	Output
<?php $No1 = 10; $No2 = 10; if ($No1 > $No2) { echo "No1 is big!"; } elseif ($No1 < $No2) { echo "No2 is big!"; } else { echo "Both are same!"; } ?>	Both are same!

PHP Switch Statement
Use the switch statement to select one of many blocks of code to be executed. It codition matches with the case value it will execute the corresponding block.

Syntax

Program	Output
<?php $No = 1; switch ($No) { case "1": echo "You have selected case 1!"; break; case "2": echo "You have selected case 2!"; break; case "3": echo "You have selected case 3!"; break; default: echo "You have not selected any case!"; } ?>	You have selected case 1!

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