string bassAckwards ( string $input )
Write a PHP function ‘bassAckwards’ that will take a comma delimited string such as:
Php,Cookies,Arrays,Mysql,LAMP
And will return a string with the individual elements reversed, but in the same order:
phP,seikooC,syarrA,lqsyM,PMAL
I am being given this question and i have no prior knowledge of php i would like an explanation of how to go about figuring this out
Since I don’t know if you have any experience programming at all, I am going to expect we are starting from scratch here.
First of all, some expressions you will need to know.
String
Function
A block of code which you can refer to in your code. This helps us to keep good coding standards, like DRY (Don’t Repeat Yourself). Instead of writing a portion of code multiple times to the code, you can just run the function whenever you need to.
Array
An array is basically a collection of data, you could envision a table.
[hr]
That should basically cover the basic knowledge needed for this task. Let’s start breaking down your text.
Ok! This is easy.
[php]<?php
// you should always start execution of PHP with <?php
/*
[hr]
Now it’s getting more challenging, but nothing we can’t handle.
So to break it down even further.
Input string
Php,Cookies,Arrays,Mysql,LAMPWe have to break this up somehow, into a list (array):
Array
(
[0] => Php
[1] => Cookies
[2] => Arrays
[3] => Mysql
[4] => LAMP
)
Then we can easily iterate trough the code, and mirror every word, into something like this:
Array
(
[0] => phP
[1] => seikooC
[2] => syarrA
[3] => lqsyM
[4] => PMAL
)
Then we can convert it back to a comma-delimited string:
phP,seikooC,syarrA,lqsyM,PMAL[hr]
This basically looks like this:
[php]<?php
function bassAckwards ($string) {
// first we break up the string into an array
$array = explode(’,’, $string);
// Let's create a variable called result to hold the modified data.
$result = array();
// I like foreach because it's quite literal, for each array entry we get a variable $word. The code inside the curly brackets will run as many times as there are array entries, if we don't break out (which we don't do in this case).
foreach ($array as $word) {
// with the square brackets we assign the value into a new array entry
$result[] = strrev($word);
}
// return the $result array, oh, and convert it back to a comma-delimited string first
return implode(',', $result);
}[/php]
[hr]
Example code:
[php]<?php
function bassAckwards ($string) {
$array = explode(’,’, $string);
$result = array();
foreach ($array as $word) {
$result[] = strrev($word);
}
return implode(',', $result);
}
$string = ‘Php,Cookies,Arrays,Mysql,LAMP’;
$newString = bassAckwards($string);
echo 'Before: ’ . $string . ‘
’;
echo 'After: ’ . $newString;[/php]
[hr]
Output:
Before: Php,Cookies,Arrays,Mysql,LAMP
After: phP,seikooC,syarrA,lqsyM,PMAL