if...else...elseif Statements

Description

The if statement execute a single statement or a group of statements if a certain condition is met. It can not do anything if the condition is false. For this purpose else is used.
Syntax
if (condition)

   execute statement(s) if condition is true;

else

  execute statement(s) if condition is false;
Example :
 

    <?php 
    $overtime=60; 
    if ($overtime<=50) 
    { 
    $pay_amt=1200; 
    $medical=1000; 
    echo "Pay Amount : $pay_amt : Medical : $medical"; 
    } 
    else 
    { 
    $pay_amt=2000; 
    $medical=1500; 
    echo "Pay Amount : $pay_amt : Medical : $medical"; 
    } 
    ?> 

As we have initialized the $overtime value as 60, therefore the else statement will be executed.

View the example in the browser
PHP: elseif statement
Description

elseif is a combination of if and else. It extends an if statement to execute a single statement or a group of statements if a certain condition is met. It can not do anything if the condition is false.

The following example display 'x is greater than y', 'x is equal to y' or 'x is smaller than y' depends on the value of $x or $y.
Example :
 

    <?php 
    if ($x > $y)  
    { 
    echo "x is bigger than y";  
    } 
    elseif ($x == $y) 
    { 
    echo "x is equal to y"; 
    }  
    else 
    { 
    echo "x is smaller than y"; 
    } 
    ?> 

PHP: else statement
Description

The if statement execute a single statement or a group of statements if a certain condition is met. It can not do anything if the condition is false. For this purpose else is used.
Syntax
if (condition)

   execute statement(s) if condition is true;

else

  execute statement(s) if condition is false;
Example :
 

    <?php 
    $overtime=60; 
    if ($overtime<=50) 
    { 
    $pay_amt=1200; 
    $medical=1000; 
    echo "Pay Amount : $pay_amt : Medical : $medical"; 
    } 
    else 
    { 
    $pay_amt=2000; 
    $medical=1500; 
    echo "Pay Amount : $pay_amt : Medical : $medical"; 
    } 
    ?> 

As we have initialized the $overtime value as 60, therefore the else statement will be executed.

View the example in the browser
PHP: elseif statement
Description

elseif is a combination of if and else. It extends an if statement to execute a single statement or a group of statements if a certain condition is met. It can not do anything if the condition is false.

The following example display 'x is greater than y', 'x is equal to y' or 'x is smaller than y' depends on the value of $x or $y.
Example :
 

    <?php 
    if ($x > $y)  
    { 
    echo "x is bigger than y";  
    } 
    elseif ($x == $y) 
    { 
    echo "x is equal to y"; 
    }  
    else 
    { 
    echo "x is smaller than y"; 
    } 
    ?

 

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