Activity 5. PHP Loops

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Problem 1

Write a PHP script that will output the following using loop.

*
* *
* * *
* * * *
* * * * *

Solution

$num = 5;
$char = "*";
for ($i=1; $i <= $num; $i++) { 
    echo $char;
    $char .= " *";
    echo "\n";
}

Output

*
* *
* * *
* * * *
* * * * *

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Problem 2

Write a PHP script that will output the following using loop.

*
* *
* * *
* * * *
* * * * *
* * * * *
* * * *
* * *
* *
*

Solution

$num = 5;
$char = "*";
for ($i=1; $i <= $num*2; $i++) {
    if ($i <= $num) {
        echo str_repeat(" *", $i);
        echo "\n";
    } else{
        echo str_repeat(" *", $num*2 + 1 - $i);
        echo "\n";
    } 
}

Output

*
* *
* * *
* * * *
* * * * *
* * * * *
* * * *
* * *
* *
*

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Problem 3

Create a script using a for loop to add all the integers between 0 and 10 and display the total. The range should be user inputted.

Solution

HTML Forms for user input
<form class="form-horizontal" method="get" action="addIntegersHandle.php">
    <legend>Add Integers to n (user input)</legend>
    <label class="control-label" for="num">Number 1</label>
    <input type="number" class="form-control" id="inputDefault" name="num">
    <button type="submit" class="btn btn-primary" id="calcSubmit">Submit</button>
</form>

PHP Code
if(isset($_GET['num'])){
    $num = $_GET['num'];
    $tot = 0;
    for ($i=1; $i <=$num ; $i++) { 
        $tot += $i;
    }
    echo "Sum between 1 to " . $num . " " . "is: " . $tot;
}

Output

Demo

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Problem 4

Write a PHP script that creates the following table (use for loops).

Solution

for ($i=1; $i <= $num3; $i++) {
    echo "<tr>";

    for ($j=1; $j <= $num3; $j++) { 
        echo "<td>" . $j * $i . "</td>";
    }
    echo "</tr>";
}

Output

1	2	3	4	5	6	7	8	9	10
2	4	6	8	10	12	14	16	18	20
3	6	9	12	15	18	21	24	27	30
4	8	12	16	20	24	28	32	36	40
5	10	15	20	25	30	35	40	45	50
6	12	18	24	30	36	42	48	54	60
7	14	21	28	35	42	49	56	63	70
8	16	24	32	40	48	56	64	72	80
9	18	27	36	45	54	63	72	81	90
10	20	30	40	50	60	70	80	90	100