functions.php

<p style="color: blue;">Use a function that capitalizes the first letter of the provided argument. Example: should return "émile""Émile"
</p>
<?php
if (!function_exists('mb_ucfirst') && function_exists('mb_substr')) {
    function mb_ucfirst($string)
    {
        $string = mb_strtoupper(mb_substr($string, 0, 1)) . mb_substr($string, 1);
        return $string;
    }
}
$name = "émile";

$name = mb_ucfirst($name);

echo $name;
?>

<hr>

<p style="color: blue;">Use the native function allowing you to display the current year.</p>

<?php

echo date("Y");

?>

<hr>

<p style="color: blue;">Now display the date, time, minutes and seconds, using the same function, by playing with the arguments.</p>

<?php

$today = date("F j, Y, g:i a");

echo $today;
?>

<hr>

<p style="color: blue;">Create a "Sum" function that takes 2 numbers and returns their sum.</p>

<?php

$a = 1;
$b = 2;
echo $a + $b;
?>

<hr>


<p style="color: blue;">Improve that function so that it checks whether the argument is indeed a Number. If not, it should display : "Error: argument is not a number."</p>

<?php

$a = 1;
$b = 2;

$tests = array(
    $a,
    $b
);


foreach ($tests as $element) {
    if (is_numeric($element)) {
        echo var_export($element, true) . " is numeric";
    } else {
        echo var_export($element, true) . "Error: argument is not a number";
    }
}


?>

<hr>

<p style="color: blue;">Create a function that takes as argument a string of characters and returns an acronym made of the initials of each word.
    Example: "In code we trust!" should return: ICWT).</p>
<?php
$s = 'In code we trust!';
$s = strtoupper($s);
echo preg_replace('/\b(\w)|./', '$1', $s);

?>

<hr>


<p style="color: blue;">Create a function that replaces the letters "a" and "e" with "æ". Example: "caecotrophie", "chaenichthys","microsphaera", "sphaerotheca" should respectively return "cæcotrophie", "chænichthys","microsphæra", "sphærotheca".</p>
<?php
$words = ['caecotrophie', 'chaenichthys', 'microsphaera', 'sphaerotheca'];

$words = str_replace('ae', 'æ', $words);
var_dump($words);

?>

<hr>


<p style="color: blue;">Create the opposite function, which replaces "æ" by "ae" in : cæcotrophie, chænichthys, microsphæra, sphærotheca</p>
<?php

$words = str_replace('æ', 'ae', $words);
var_dump($words);


?>

<hr>