gistfile1.php

<?php

/*
    Turn a url like 's:true:c:shoes:a:heavy' into something like
    
    Array (
        s: 'true', // safety vs. non-safety
        c: 'shoes', // category = shoes
        a: 'heavy // audience = heavy
    );
    
    - Split on the :, the first item will clearly be a key, whilst the second will be a value for that key.
    - If the value is a-z, lowercase, and one single character, it is a key, and it's following piece (index+1) will be it's value
    
    - We can reliably assume it will be key:value:key:value but there must be some way to ensure this 100%.
    - Other possiblities, abc:value : xyz:value : x:x : x:X:X
    
    
    ////// methods
    
    With being able to switch from a diff category to another
    
    $this->set('keyword', 'value') // if exists, override, otherwise, set it
    
    $this->get('keyword') // Get a specific keyword's value
    
    $this->get() // no value passed, return an array of all of em
    
    
*/
class WhaleRL {
    
    // Create a holding area for the new values
    private $body;
    
    function __construct($url) {
        $url_bits = explode(':', $url);
        
        // If the lenfth of the URL pieces is not an even number (an equal number of key:val pairs), someone failed.
        if ((count($url_bits) % 2) == 1)
            return false;
        
        foreach ($url_bits as $key => $value) {
            // Check to see if this is a key (one single lowercase letter)
            if (preg_match("/^[a-z]$/", $value)) {
                // if this returns true, this is a key, so set it in the array
                $body[$value] = $url_bits[$key+1];
            }
        }
        
        $this->body = $body;
        
        // Template::debug($this->body);
        
    }
    
    // $this->set('keyword', 'value') // if exists, override, otherwise, set it
    function set($keyword, $value = NULL) {
        // $this->body[$keyword] = $value;
        // return $this->body[$keyword];
        return $this->body[$keyword] = $value;
    }
    
    // $this->get('keyword') // Get a specific keyword's value
    function get($keyword = false) {
        if ($keyword AND isset($this->body[$keyword])) {
            return $this->body[$keyword];
        } else if ($keyword AND !isset($this->body[$keyword])) {
            return false;
        } else {
            return $this->body;
        }
    }
    
    // Build a temporary result to use in a redirection URL. Pass an array of keywords to add or remove.
    // If a keyword and a value is passed, add it or replace it, if a keyword is just sent, remove it 
    // Either way... the $this->body is returned.
    function build($keyword, $value = false) {
        $copy = $this->body;
        
        if ($value) {
            $copy[$keyword] = $value;
        } else {
            unset($copy[$keyword]);
        }
        
        $new_url = array();
        
        foreach ($copy as $key => $value) {
            $new_url[] = $key.':'.$value;
        }
        
        return implode(':', $new_url);
    }
    
}