function

helpmehelpmehelpme · December 12, 2011

I'm trying to write a function that accepts two arguments, first and last name, then returns the initials of the first and last name in a single string, and I'm having trouble getting started. This is all I got.

<?php
function first_and_last ($first_name, $last_name){

}
?>

mikosiko · December 12, 2011

...and I'm having trouble getting started...

here is a good place to start working on your problems

http://php.net/manual/en/language.functions.php

Winstons · December 12, 2011

Do you mean this

function first_and_last ($first_name, $last_name){
    return substr($first_name, 0, 1) . '. ' . substr($last_name, 0, 1) . '.';
}

After, you can call this function

echo first_and_last('John', 'Smith');

bluejay002 · December 12, 2011

Alternatively, you can do it this way:

function first_and_last($first_name, $last_name) {
    return $first_name[0] . '. ' . $last_name[0] . '.';
}

Cheers,

Jay

helpmehelpmehelpme · December 12, 2011

okay, I have index.php

<!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=utf-8" />
<title>Functions!</title>
</head>
<body>
<p>Please enter your first and last name so I can 
give you your initials.</p>

<form action="functions.php" method="post">
<p>First Name: <input type="text" name="first_name" size="20" /></p>
<p>Last Name: <input type="text" name="last_name" size="20" /></p>
<input type="submit" name="submit" value="Get My Initials" />
</form>
</body>
</html>

and function.php

<?php

function first_and_last($first_name, $last_name ) {
    return $first_name[0] . '. ' . $last_name[0] . '.';
}
?>

if i'm posting $first_name and $last_name from the index.php page to the functions.php page where would I put the $_POST? or how would i write it into the code

Winstons · December 12, 2011

In function.php you must write

<?php

function first_and_last($first_name, $last_name ) {
    return $first_name[0] . '. ' . $last_name[0] . '.';
}

echo first_and_last($_POST['first_name'], $_POST['last_name']);

bluejay002 · December 12, 2011

You can also check this tutorial to give you more light with PHP functions.

http://www.w3schools.com/php/php_functions.asp

helpmehelpmehelpme · December 12, 2011

oh duh, i was thinking you had to do the $_POST up in the function somewhere...thanks for your help..

bluejay002 · December 12, 2011

Well, you could since $_POST is superglobal but that defies the purpose of having a function and only makes it less reusable for any other variables that wish to use it.

helpmehelpmehelpme · December 12, 2011

can you do like a loop or something that would let the user enter like 5 other names and have it print out all of the initials?

Winstons · December 12, 2011

Do you mean it ?

function first_and_last()
{
    $names = func_get_args();
    return array_map(create_function('$item', 'return $item[0] . ".";'), $names);
}

echo '<pre>'.print_r(first_and_last('John', 'Brad', 'Joseph'), 1).'</pre>';

helpmehelpmehelpme · December 12, 2011

i need one where the user can enter the names themselves and have it cycle through and print out the initials of all the names the user has entered...

Winstons · December 12, 2011

Is it ?

function first_and_last()
{
    $names = func_get_args();
    $str = '';
    foreach($names as $name)
        $str .= $name[0] . '.<br/>';
    
    return $str;
}
echo first_and_last('John', 'Brad', 'Joseph');

helpmehelpmehelpme · December 12, 2011

i have this, but for some reason that i cant figure out it's giving me extra letters. if i enter kelly norton, it outputs fknl or jerry lewis, fjll, here's the code:

index.php

<!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=utf-8" />
<title>Functions!</title>
</head>
<body>
<p>Please enter your first and last name so I can 
give you your initials.</p>

<form action="functions.php" method="post">


<?php
for ($i = 0; $i < 5; $i++)
{
    // Maybe do a fieldset to separate each group.
    print '<legend>Enter Name</legend>';
    print('<label for="first_name%d">First Name:</label>', $i);
    print('<input id="first_name%d" type="text" name="name[][first]" size="20" />', $i);
    print('<label for="last_name%d">Last Name:</label>', $i);
    print('<input id="last_name%d" type="text" name="name[][last]" size="20" />', $i);
    //print '</fieldset>';
}
?>
<input type="submit" name="submit" value="Get My Initials" />


</body>
</html>

functions.php

<?php


if (isset($_POST['name']) && is_array($_POST['name']))
{
    foreach ($_POST['name'] AS $fullname)
    {
        list($first, $last) = each($fullname);
        print first_and_last($first, $last);
    }
}
function first_and_last($first_name, $last_name ) {
    return $first_name[0] . '. ' . $last_name[0] . '.';

}
//echo first_and_last($_POST['first_name'], $_POST['last_name']);
?>

Winstons · December 12, 2011

Your code has 'notice'

Therefore you must correct it, this way:

index.php

<!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=utf-8" />
<title>Functions!</title>
</head>
<body>
<p>Please enter your first and last name so I can 
give you your initials.</p>

<form action="functions.php" method="post">
<?php
for ($i = 0; $i < 5; $i++)
{
    // Maybe do a fieldset to separate each group.
    print '<legend>Enter Name</legend>';
    printf('<label for="first_name%d">First Name:</label>', $i);
    printf('<input id="first_name%d" type="text" name="name[][first]" size="20" />', $i);
    printf('<label for="last_name%d">Last Name:</label>', $i);
    printf('<input id="last_name%d" type="text" name="name[][last]" size="20" />', $i);
    //print '</fieldset>';
}
?>
<input type="submit" name="submit" value="Get My Initials" />
</body>
</html>

functions.php

<?php
if (isset($_POST['name']) && is_array($_POST['name']))
{
    foreach ($_POST['name'] AS $fullname)
    {
        list($first, $last) = each($fullname);
        print first_and_last($first, $last);
    }
    echo '<br/>';
}
function first_and_last($first_name, $last_name ) {
    return (!empty($first_name) && !empty($last_name)) ? $first_name[0] . '. ' . $last_name[0] . '.' : '';
}
?>

helpmehelpmehelpme · December 12, 2011

i did that, but it's still giving me the extra f and l letters in addition to the initials. Im stumped..ive been working on this for two days now and i cant seem to figure out where the extra letters are coming from

helpmehelpmehelpme · December 12, 2011

okay, i did that, but im still getting the extra letters.

Winstons · December 12, 2011

OK. This is residual code. And extra letters is missing

fnction.php

<?php
if (isset($_POST['name']) && is_array($_POST['name']))
{
    $array = $_POST['name'];
    for($i = 0; $i < sizeof($array); $i++)
    {
        $first = !empty($array[$i]['first']) ? $array[$i]['first'] : '';
        $last = !empty($array[$i + 1]['last']) ? $array[$i + 1]['last'] : '';
        echo first_and_last($first, $last);
    }
}
function first_and_last($first_name, $last_name ) {
    return (!empty($first_name) && !empty($last_name)) ? $first_name[0] . '. ' . $last_name[0] . '.' : '';
}
?>

helpmehelpmehelpme · December 12, 2011

sweeeeeet....that fixed it thanks

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