PHP Code Sample

phpsample.php

<?php
// Jake Toolson
// PHP Code Sample
// This illustrates the styles I use and techniques/methods used to problem solve.


function words_sort_callback($a, $b)
{
	if ($b[0] - $a[0])
	{
		return $k;
	}
	
	return strcmp($b[1], $a[1]);
}

// Submitted text.
$text = 'The duck flew over the pond while in search of other ducks nearby.  The ducks in the pond however were decoys and the hunters were nearing.';

// Sanitize the incoming string stripping out tags and additional characters using the FILTER_SANITIZE_STRING filter.
// Convert all text to lowercase as requested
$text_clean = filter_var(strtolower($text), FILTER_SANITIZE_STRING);

// Convert sanitized string to an array based on matched expression requirements (a-z, and 0-9). 
// Expression can me modified to allow additional charcters
// Ignore empty returns with PREG_SPLIT_NO_EMPTY constraint
// Convert array to a array( Text => Count ) format
$words_array = array_count_values(preg_split('/[^a-z0-9]+/', $text_clean, -1, PREG_SPLIT_NO_EMPTY)); 

// This could be done using an array_map function, but left it in a method easier to read for some.
// Remap the array/key combination to:
// Array (
//		array ( text )
//		array ( count )
foreach ($words_array as $k => $v)
{
	$words_mapped[] = array($k, $v);
}

// Push array to sorting callback, sorting by total first.
usort($words_mapped,'words_sort_callback'); 

// original input
printf("%s\n", $text);

// Final result with word count
echo '<pre>';
print_r($words_mapped);
echo '</pre>'; 


// If this were to be imported into a database, using PHP 5's PDO class or a standard database library 
// found within an MVC framework, you can typically perform inserts by using prepared statements which also
// add a layer of "sanitation" at the database insert level.