<?php

    error_reporting(E_ALL | E_STRICT);

/*

Manual optional type checking for PHP functions
   
Basic example:
   
    function log_error($line_number, $filename, $desc)
    {
        CheckFunctionArgs('integer', 'string', 'string');
        [snip]
    }
   
Object example:
   
    class LogObject {}
    function register_object($obj)
    {
        //  Check for an object
        CheckFunctionArgs('object');   

        //  When an object is passed, you can optionally check for the class name
        CheckFunctionArgs('LogObject');

        [snip]
    }

Wildcard example:

    function log_anything($line, $thing)
    {
        //  '*' really means anything, included true/false/null or an empty string
        //  however it doesn't mean the argument in optional
        CheckFunctionArgs('integer', '*');
    }

Notes:

    Throws an exception on error
    No support for functions that take a variable number of arguments
    Must define the types of all arguments
    The type '*' acts as a wild card, matching anything (including null)
    Works with public and private methods in classes
   
*/

    function CheckFunctionArgs()
    {
        $types = func_get_args();
        $stack = debug_backtrace();

        //  Make sure there is some stack information
        //  Stack[1] contains the details about the function that called this function
        if(!isset($stack[1]))
        {
            throw new Exception("No function stack present.  Make sure CheckFunctionArgs() isn't called from the global scope");
        }

        //  The arguments that were passed to the function we are checking
        $arguments = $stack[1]['args'];


        //  Get the name of the class/function/file
        $functionClass = (isset($stack[1]['class'])) ? $stack[1]['class'] . "::" : '';
        $functionFile  = (isset($stack[1]['file'])) ? basename($stack[1]['file']) . ':' . $stack[1]['line'] : '[No file information]';
        $functionName  = "{$functionClass}{$stack[1]['function']}()";
       
       
        //  Basic check, make sure the correct numbers of arguments were passed
        if(count($arguments) != count($types))
        {
            $passed = count($arguments);
            $expected = count($types);

            throw new Exception("Incorrect number of argumemts passed to {$functionName} in {$functionFile}.  Expected {$expected} got {$passed}");
        }


        //  Now try and check each argument
        for($i = 0; $i < count($arguments); $i++)
        {
            //  Allow a check to be skiped, if the type equals '*'
            if($types[$i] == '*')
            {
                continue;
            }

            $argumentType = gettype($arguments[$i]);
           
            //  Check basic types like integer/object ect
            if($argumentType == $types[$i])
            {
                continue;
            }

            //  Check to see if the type matches the classname of an object
            if(($argumentType == 'object') && (get_class($arguments[$i]) == $types[$i]))
            {
                continue;
            }

            throw new Exception("Incorrect argument passed to {$functionName} in {$functionFile}.  Argument {$i} was type {$argumentType} expected {$types[$i]}");
        }


        return true;
    }

    //  Some really basic tests

    function assertException($fun, $args)
    {
        try
        {
            call_user_func_array($fun, $args);
            throw new Exception(sprintf("Error: No exception thrown in function %s\n", $fun));
        }
        catch(Exception $e)
        {
        }
    }

    function assertNoException($fun, $args)
    {
        try
        {
            call_user_func_array($fun, $args);
        }
        catch(Exception $e)
        {
            throw new Exception(sprintf("Error: Exception thrown in function %s\n", $fun));
        }
    }


    function test_string($a)
    {
        CheckFunctionArgs('string');
    }

    assertNoException('test_string', array('abc'));
    assertNoException('test_string', array(''));
    assertNoException('test_string', array('123'));

    @assertException('test_string', array());
    assertException('test_string', array(123));
    assertException('test_string', array(null));


    function test_integer($a)
    {
        CheckFunctionArgs('integer');
    }

    assertNoException('test_integer', array(0));
    assertNoException('test_integer', array(123));

    @assertException('test_integer', array());
    assertException('test_integer', array(null));
    assertException('test_integer', array(''));
    assertException('test_integer', array('a'));
    assertException('test_integer', array(1.0));
    assertException('test_integer', array(1.2));


    function test_wildcard($a)
    {
        CheckFunctionArgs('*');
    }

    assertNoException('test_wildcard', array('a'));
    assertNoException('test_wildcard', array(1233));
    assertNoException('test_wildcard', array(null));
    @assertException('test_wildcard', array());


    class Foobar {}
    $foobar = new Foobar();
    function test_classname($a)
    {
        CheckFunctionArgs('Foobar');
        CheckFunctionArgs('object');
    }

    assertNoException('test_classname', array($foobar));
    assertException('test_classname', array('Foobar'));

?>

<?php

define('WORD_LIST_FILENAME', '/usr/share/dict/words');


class AnagramLookup
{
    private $lookup;

    //  Loads a file with one word per line
    private function load_word_list($filename)
    {
        $lines = file($filename);                     // One word per line
        $lines = array_map('trim', $lines);           // Strip any excess whitespace
        $lines = array_filter($lines, 'ctype_alpha'); // Words been to match [a-zA-Z]
        $lines = array_map('strtolower', $lines);     // Set all the words to lowercase
        $lines = array_unique($lines);                // Remove any duplicate words
        $lines = array_diff($lines, array(''));       // Remove any empty lines

        return $lines;
    }

    //  Sort the individual letters in a string
    //  i.e.   tale  =>  aelt
    private function sort_letters($word)
    {
        $letters = str_split($word);
   
        sort($letters);
   
        $sorted_word = implode('', $letters);
   
        return $sorted_word;
    }

    //  Generate our lookup table.  This takes ~1.5second for 70,000 words
    //  $lookup ends up looking like:
    //
    //  $lookup[4] = array
    //  (
    //      'aelt' => array('late', 'tale', 'leta', 'teal'),
    //      'belu' => array('blue', 'lube'),
    //      [etc...]
    //  )
    //  $lookup[5] = array
    //  (
    //      'allms' => array('small', 'malls'),
    //      [etc...]
    //  )
    //
    //  4 and 5 are the word lengths, while 'aelt', 'belu' and 'allms'  contains
    //  an array of all the words that can be spelt using these letters
    public function __construct($filename)
    {
        $word_list = $this->load_word_list($filename);

        $lookup = array();

        foreach($word_list as $word)
        {
            $length = strlen($word);

            if(!isset($lookup[$length]))
            {
                $lookup[$length] = array();
            }

            $sorted_word = $this->sort_letters($word);

            if(!isset($lookup[$length][$sorted_word]))
            {
                $lookup[$length][$sorted_word] = array();
            }

            $lookup[$length][$sorted_word][] = $word;
        }

        $this->lookup = $lookup;
    }

    //  Return all the anagrams of the passed word
    public function lookup_word($word)
    {
        $word_length = strlen($word);
        $sorted_word = $this->sort_letters($word);

        if(isset($this->lookup[$word_length][$sorted_word]))
        {
            return $this->lookup[$word_length][$sorted_word];
        }

        return array();
    }

    //  Return an array of all the sets of anagrams with a specific length
    //
    //  Example result for a word length of 14:
    //
    //  array
    //  (
    //      [0] => array('certifications','rectifications'),
    //      [1] => array('impressiveness','permissiveness'),
    //      [2] => array('tablespoonfuls','tablespoonsful'),
    //  )
    public function all_of_length($word_length)
    {
        if(!isset($this->lookup[$word_length]))
        {
            return array();
        }

        $results = array();

        foreach($this->lookup[$word_length] as $words)
        {
            if(count($words) > 1)
            {
                $results[] = $words;
            }
        }

        return $results;
    }
}


$anagram = new AnagramLookup(WORD_LIST_FILENAME);

printf("Anagrams of 'blue': %s\n", implode(', ', $anagram->lookup_word('blue')));
printf("Anagrams of 'late': %s\n", implode(', ', $anagram->lookup_word('late')));
printf("Anagrams of 'slow': %s\n", implode(', ', $anagram->lookup_word('slow')));
printf("Anagrams of 'seven':  %s\n", implode(', ', $anagram->lookup_word('seven')));
printf("Anagrams of 'anagram': %s\n", implode(', ', $anagram->lookup_word('anagram')));

printf("All anagrams of word length 14\n");

foreach($anagram->all_of_length(7) as $words)
{
    printf(" * %s\n", implode(', ', $words));
}


?>

$row = $table->tr();

if(!($amIAltOrNot = !$amIAltOrNot))
{
    $row->class = "alt";
}


//  Edit: Much better now
$row = $table->tr();

$row->class = ($amIAltOrNot = !$amIAltOrNot) ? "" : "alt";