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PHP Control Structures Ex. #3: Simple For Loop

Loops are very useful in creating lists and tables. In this PHP exercise, you will use a loop to create a list of equations for squares.

Using a for loop, write a script that will send to the browser a list of squares for the numbers 1-12.
Use the format, "1 * 1 = 1", and be sure to include code to print each formula on a different line.

Here's the script:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

```
 
```

<html xmlns="http://www.w3.org/1999/xhtml"  xml:lang="en" lang="en">

```
<head>
```

<meta http-equiv="content-type" content="text/html;charset=iso-8859-1" />

<title>Squares for the Numbers 1-12</title>

```
</head>
```
```
 
```
```
<body>
```
```
<h2>Squares for the Numbers 1-12</h2>
```
```
 
```
```
<?php
```
```
 
```
```
for ($x=1; $x<=12; $x++){
```
```
  $result = $x * $x;
```
```
  echo "$x * $x = $result <br />\n";
```
```
}
```
```
 
```
```
?>
```
```
 
```
```
</body>
```
```
</html>
```

See the output of the script in a separate window here. You can also view the output's HTML source from the new window, if you need to check that.

To open a PHP code editor in a new tab, click here.

Comments

not be be rash

Permalink Submitted by casper on Fri, 05/06/2011 - 15:13.

Not to be rude, but I think that this lesson could use a little re-wording. I was a little confused, as I was assuming you wanted actual squares like table squares. making a list would probably be a little easier to understand. Good work with the site, I really enjoy it.

Glad you enjoy it

Permalink Submitted by admin on Fri, 05/06/2011 - 15:42.

Glad you enjoy the site. Regarding this exercise, we feel that giving the example equation "1*1=1" makes it clear what kind of squares are being requested.

where is the new line

Permalink Submitted by DaGirl on Fri, 07/20/2012 - 08:11.

hi... Probably no one is reading this again cos most comments were last years. I tried d exercise but in ur answer- i didnt find d script for d new lines. Here is mine- i got d ans but worried if my < ol> is unneccessary:
for($a=1;$a <= 12; $a++){
$b= $a*$a;
echo "< ol>$a*$a = $b < /ol>;
}
good work here.. Can more exercises be created? Thx!

alternative script

Permalink Submitted by rabellamy on Mon, 08/06/2012 - 12:06.

$foo = 1;
while($foo <= 12) {
echo "$foo * $foo = ". pow($foo, 2)."";
$foo++;
}

nice!

Permalink Submitted by ghettosoak on Fri, 09/07/2012 - 03:16.

a hardened javascript developer, I really want to learn how to bring more backend experience to my users, not to mention learning how everything works behind the scenes, and being able to get my hands dirty in various CMSs when things go awry. this site is great for getting sanding off the awkward edges between the languages, while still hammering home the basics. excellent! : )

Different solution using string concatenation and HTML5

Permalink Submitted by djroelfsema on Sat, 10/20/2012 - 04:13.

```
<!DOCTYPE html>
```
```
<HTML>
```
```
    <HEAD>
```

        <TITLE>Squares for the Numbers 1-12</TITLE>

```
    </HEAD>
```
```
    <BODY>
```
```
        <?php
```
```
            for($x=1; $x<=12; $x++)
```
```
            {
```

                echo "$x x $x = ".($x*$x)."<BR />";

```
            }
```
```
        ?>
```
```
    </BODY>
```
```
</HTML>
```

pow solution

Permalink Submitted by boksa on Wed, 12/19/2012 - 16:07.

<?php
	$i = 1;
	for ($i = 1; $i <= 12; $i++){
		$f = pow($i,2);
		echo "$i squared is: $f";
	}
?>

Why used BR tag with \n

Permalink Submitted by muhammad..ali.khamis on Mon, 02/18/2013 - 01:03.

echo "$x * $x = $result \n"

Why you have used BR tag and \n.
Both are for new line. Why do you used both? However, BR tag is enough.. Am I right?

Answered in earlier exercise.

Permalink Submitted by admin on Mon, 02/18/2013 - 21:46.

See http://phpexercises.com/php-variable-data-types-exercise.html

I thought we were supposed to print the quotes too...

Permalink Submitted by ericjric on Tue, 03/19/2013 - 00:42.

This is how I printed the quotes.


<?php 

for ($i=1; $i<13; $i++){
	echo "\"$i * $i = ".($i*$i)."\"";
}

?>

Here's mine using pow

Permalink Submitted by roon83 on Wed, 05/28/2014 - 16:06.

Used the pow() function to get the results.

```
<!DOCTYPE HTML>
```
```
<html>
```
```
	<head>
```

		<meta http-equiv="content-type" content="text/html; charset=utf-8">

```
		<title>Phpex-10</title>
```
```
	</head>
```
```
	<body>
```
```
		<?php
```
```
			for ($i = 1; $i < 13; $i++) {
```

				echo "$i * $i = " . pow($i, 2) . "<br />";

```
			}
```
```
		?>
```
```
	</body>
```
```
</html>
```

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PHP Control Structures Ex. #3: Simple For Loop

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