PHP and Javascript (JS) if,if else,if elseif...else


PHP and Javascript (JS) if,if else,if elseif...else


What is If Statement in Programing ?
In programing we need to check the condition if condition is true then we perform task 1 else we perform task 2
then we can check this conditions by if statement


Simple Voting Example
If Our Age is Greater then 18 we are eligible for vote else we are not eligible.


if (we are greater than 18)
{
eligible
}
else
{
we are not eligible
}


Condition Statements Are Of Four Types


1. if statement - Execute Condition if true
2. if...else statement - Execute Task 1 if condition true otherwise Perform Task 2
3. if...elseif....else statement - Executes Task More Than One Condition if Condition Satisfy Perform The Task Else Perform Default else Task
4. switch statement - Perform Task If Condition Satify in any Case and Perform The Result.


if syntax


if (condition) {
if condition true
}


Example 1
if Condition in php


<?php
$a=1;
if($a%2==0) //checking the condition
{
echo "even no"; //print even no if condition is true but here we will get nothing because 1 is an odd number
}
?>


if Condition in Javascript (Js)


<html>
<head>
</head>
<body>
<h1>If Statement in Javascript</h1>
</body>
<script>
var a=1;
if(a%2==0) //checking the condition
{
console.log("even no"); //we get the output nothing in our console by clicking on F12
}
</script>
</html>
Flow Chart Of if Statement


if else syntax


if (condition) {
if condition true
}
else
{
else condition true
}


Example 1
if else Condition in php


<?php
$a=1;
if($a%2==0) //checking the condition
{
echo "even no";  //print even no if condition is true but here we will get nothing because 1 is an odd number
}
else{
echo "odd no";  //print odd no. we know that 1 is a odd number
}
?>


if else Condition in Javascript (Js)


<html>
<head>
</head>
<body>
<h1>If else Statement in Javascript</h1>
</body>
<script>
var a=1;
if(a%2==0) //checking the condition
{
console.log("even no"); //we get the output nothing in our console by clicking on F12
}
else
{
console.log('odd no'); //we get output odd no
}
</script>
</html>
Flow Chart Of if else Statement


The if...elseif....else


if (condition) {
if condition true
}
elseif
{
else condition second
}
else
{
else third condition
}


Example 1
if elseif.. if Condition in php


<?php
$a=1;
if($a<0) //checking the condition
{
echo "a is smaller then zero"; 
}
else if($a>1) //second condition
{
echo "a is smaller then 1";
}
else //else last condition
{
echo “a is equal to 1”;
}
?>


if else Condition in Javascript (Js)


<html>
<head>
</head>
<body>
<h1>If elseif... else Statement in Javascript</h1>
</body>
<script>
var a=1;
if(a<0) //checking the condition
{
console.log( "a is smaller then zero"); 
}
else if(a>1) //second condition
{
console.log("a is smaller then 1");
}
else //else last condition
{
console.log( “a is equal to 1”);
}
</script>
</html>
Flow Chart Of if elseif....else Statement

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