Php Course – Worldwideasy – 04

php lesson 4. I will focus on Getting Control Statements (IF statement, Switch, loops). Finally, Create a simple Grading Calculator. It can provide extensive knowledge.

Control Statements

A control statement is a statement that determines whether other statements are active. If a statement decides whether another statement should be executed, or one of the two statements to be executed. A loop determines the number of times another expression should be executed.

Basically have 3 control statement

  • IF
  • Switch
  • Loops

IF Statement in php

If a statement is used to check the condition, it can be a condition or more. The special feature of it is that you can check any gap. The following example will make it clear to you.

<?php
$name = "apple";
if ($name="apple"){
echo "true";
}
else{
echo "false";
}
?>

This Code output is true.

Switch

The switch expression is used to check several non-gap conditions. This works very fast and gets the idea below

<?php
$ grade = $_POST["grade"];
switch ($grade) {
	case 'A':
		echo "A";
		break;
		case 'B':
		echo "B";
		break;
		case 'C':
		echo "C";
		break;
		case 'S':
		echo "S";
		break;
		default:
		# code...
		break;
}

Loops

Loops have main 3 loops in php

  • For loop
  • While loop
  • Do While loop
  • Foreach Loop

Now I show the First 3 loops using Code. See Below all code output is the same. output is : 1,2,3,4,5,6,7,8,9,10

For Loop

this is a simple and easy loop in any programming language.

<?php
for ($int = 0; $int <= 10; $int++) {
  echo "$int <br>";
}
?>

While Loop

<?php
$int = 1;

while($int <= 10) {
  echo "$int <br>";
  $int++;
}
?>

Do while Loop

<?php
$int = 1;

do {
  echo "$int <br>";
  $int++;
} while ($int <= 10);
?>

Foreach Loop

This is a special loop for php. This is commonly used for arrays. see below example

<?php
$laptops = array("Dell", "Apple", "Hp", "Azus");

foreach ($laptops as $value) {
  echo "$value <br>";
}
?>

Include

you can see below example it do include HTML and php file.

<?php
include "header.html"
include "index.php"
?>

Simple Grading Calculator

See the example below and give it a try. This is a simple hierarchical calculator code. It has an HTML code that you can try on your computer. This calculator is made using what we have learned so far. So you can get a very good experience by practicing this.

<!DOCTYPE html>
<html>
<head>
	<title>Grading Calculator</title>
</head>
<body>
	<h2>Grading Calculator</h2><br>
    <form action="site.php" method="POST">
    	Marcks : <input type="number" name="num">
    	<input type="submit">
    	<br>
    	Grade is : 
    	<!--php code-->
    	<?php
    	$num = $_POST["num"];
    	if($num>=75){
    		echo "A";
    	}elseif ($num>=65) {
    		echo "B";
    	}elseif ($num>=65) {
    		echo "C";
    	}elseif ($num>=65) {
    		echo "S";
    	}else{
    		echo "F";
    	}
    	?>
    	
    </form>


</body>
</html>

Save this file. filename is site.php.

php
Output

Thank you for all! do you have any questions Click here!

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See you Next Lesson Soon!

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