loops.php

<h1>Loops are a logic structure that is useful to repeat a block of instructions several times. foreach, while, for are the three different looping structures.</h1>

<p style="color: red;">For each element of the array $plates, call it $plate then apply the instruction : wash_plate().</p>

<?php
$names = array('John', 'jeanne', 'Joan', 'émile');
foreach ($names as $name) {
    echo ucfirst($name);
}
?>

<hr>

<p style="color: red;">Foreach, with the key index.</p>

<?php
$names = array('John', 'jeanne', 'Joan', 'émile');
var_dump($names);

foreach ($names as $key => $value) {
    $names[$key] = ucfirst($value);
}
var_dump($names);
?>

<hr>

<p style="color: red;">Using foreach, build a loop that displays each element of the array.</p>

<?php
$pronouns = array('I', 'You', 'He/She', 'We', 'You', 'They');


foreach ($pronouns as $key => $value) {
    $pronouns[$key] = print_r($pronouns);
}

?>

<hr>
<p style="color: red;">Then, modify your loop so as to conjugate the verb "to code" in the present tense. Use a <br> to go to the next line. The result should be :
    I code
    You code
    He/She codes
    We code
    You code
    They code</p>

<?php
$pronouns = array('I', 'You', 'He/She', 'We', 'You', 'They');


foreach ($pronouns as $key => $value) {
    if ($pronouns[$key] == 'He/She') {
        array_push($pronouns, $pronouns[$key], 'codes');
    } else {
        array_push($pronouns, $pronouns[$key],'code');
    }
}

print_r($pronouns)

?>

<hr>

<p style="color: red;">You can also loop inside a string
    While loop
    Bart Simpson has been (again) punished : he must copy 100 times "I shall not watch flies fly when I'm learning PHP".

    Let's use another loop structure to do just that: the Whileloop</p>

<?php
$amount_of_lines = 1;

while ($amount_of_lines <= 100) {
    echo $amount_of_lines . '. : I shall not watch flies fly when I am learning PHP.';
    // shorthand writing for 
    // $amount_of_lines = $amount_of_lines +1;
    $amount_of_lines++;
}
?>

?>

<hr>

<p style="color: red;">For loop
    Here is a third looping structure: the For loop. Check this out :</p>

<?php
for ($amount_of_lines = 1; $amount_of_lines <= 100; $amount_of_lines++) {
    echo $amount_of_lines . '. : I shall not watch flies fly when I am learning PHP.<br />';
}
?>

<hr>

<h1>Exercises</h1>

<p style="color: red;">Write a script that prints the numbers from 1 to 120 using while
</p>
<?php

$n = 1;

while ($n <= 120) {
    echo $n++;
}
?>

<hr>
<p style="color: red;">Write a script that prints the numbers from 1 to 120 using for
</p>
<?php

for ($n = 1; $n <= 120; $n++) {
    echo $n;
}
?>

<hr>

<p style="color: red;">Create an array containing at least 10 countries. Then, generate the html that will render a select box inside an html form (see mockup below). Of course, a loop will be useful...
</p>
<?php

$pays = array('BE' => 'Belgique', 'BZ' => 'Belize', 'BO' => '	The Plurinational State of Bolivia', 'AT' => 'Austria', 'EE' => 'Estonia', 'FI' => 'Finland', 'FR' => 'France', 'HT' => 'The Republic of Haiti', 'HN' => 'Hinduras', 'IS' => 'Island');

?>

<hr>
<form type="get">
    <select name='pays'>

        <?php

        foreach ($pays as $iso => $pay) {
            echo "<option value='$iso'>$pay</option>";
        }


        ?>
    </select>
</form>