Hangman Game in PHP : Complete Source Code

Hangman is a paper and pencil guessing game for two or more players. One player thinks of a word, phrase or sentence and the other(s) tries to guess it by suggesting letters within a certain number of guesses.

Complete Source Code

config.php

<?php
    $MAX_ATTEMPTS = 7;
    $WORDLISTFILE = 'wordlist.txt';
?>

functions.php

<?php
/*
    Function Name: fetchWordArray()
    Parameters: None
    Return values: Returns an array of characters.
*/
    function fetchWordArray($wordFile)
    {
        $file = fopen($wordFile,'r');
           if ($file)
        {
            $random_line = null;
            $line = null;
            $count = 0;
            while (($line = fgets($file)) !== false) 
            {
                $count++;
                if(rand() % $count == 0) 
                {
                      $random_line = trim($line);
                }
        }
        if (!feof($file)) 
        {
            fclose($file);
            return null;
        }else 
        {
            fclose($file);
        }
    }
        $answer = str_split($random_line);
        return $answer;
    }
/*
    Function Name: hideCharacters()
    Parameters: Word whose characters are to be hidden.
    Return values: Returns a string of characters.
*/
    function hideCharacters($answer)
    {
        $noOfHiddenChars = floor((sizeof($answer)/2) + 1);
        $count = 0;
        $hidden = $answer;
        while ($count < $noOfHiddenChars )
        {
            $rand_element = rand(0,sizeof($answer)-2);
            if( $hidden[$rand_element] != '_' )
            {
                $hidden = str_replace($hidden[$rand_element],'_',$hidden,$replace_count);
                $count = $count + $replace_count;
            }
        }
        return $hidden;
    }
/*
    Function Name: checkAndReplace()
    Parameters: UserInput, Hidden string and the answer.
    Return values: Returns a character array.
*/
    function checkAndReplace($userInput, $hidden, $answer)
    {
        $i = 0;
        $wrongGuess = true;
        while($i < count($answer))
        {
            if ($answer[$i] == $userInput)
            {
                $hidden[$i] = $userInput;
                $wrongGuess = false;
            }
            $i = $i + 1;
        }
        if (!$wrongGuess) $_SESSION['attempts'] = $_SESSION['attempts'] - 1;
        return $hidden;
    }
    
    
/*
    Function Name: checkGameOver()
    Parameters: Maximum attempts, no. of attempts made by user, Hidden string and the answer.
    Return values: Returns a character array.
*/
    function checkGameOver($MAX_ATTEMPTS,$userAttempts, $answer, $hidden)
    {
        if ($userAttempts >= $MAX_ATTEMPTS)
            {
                echo "Game Over. The correct word was ";
                foreach ($answer as $letter) echo $letter;
                echo '<br><form action = "" method = "post"><input type = "submit" name' + 
                  ' = "newWord" value = "Try another Word"/></form><br>';
                die();
            }
            if ($hidden == $answer)
            {
                echo "Game Over. The correct word is indeed ";
                foreach ($answer as $letter) echo $letter;
                echo '<br><form action = "" method = "post"><input ' + 
                  'type = "submit" name = "newWord" value = "Try another Word"/></form><br>';
                die();
            }
    }
?>

index.php

<?php session_start();?>
<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Hangman</title>
</head>

<body>
<?php

    include 'config.php';

    include 'functions.php';

    if (isset($_POST['newWord'])) unset($_SESSION['answer']);

    if (!isset($_SESSION['answer']))

    {

        $_SESSION['attempts'] = 0;

        $answer = fetchWordArray($WORDLISTFILE);

        $_SESSION['answer'] = $answer;

        $_SESSION['hidden'] = hideCharacters($answer);

        echo 'Attempts remaining: '.($MAX_ATTEMPTS - $_SESSION['attempts']).'<br>';
    }else
    {
        if (isset ($_POST['userInput']))
        {
            $userInput = $_POST['userInput'];
            $_SESSION['hidden'] = checkAndReplace(strtolower($userInput), $_SESSION['hidden'], $_SESSION['answer']);
            checkGameOver($MAX_ATTEMPTS,$_SESSION['attempts'], $_SESSION['answer'],$_SESSION['hidden']);
        }
        $_SESSION['attempts'] = $_SESSION['attempts'] + 1;
        echo 'Attempts remaining: '.($MAX_ATTEMPTS - $_SESSION['attempts'])."<br>";
    }
    $hidden = $_SESSION['hidden'];
    foreach ($hidden as $char) echo $char."  ";
?>
<script type="application/javascript">
    function validateInput()
    {
    var x=document.forms["inputForm"]["userInput"].value;
    if (x=="" || x==" ")
      {
          alert("Please enter a character.");
          return false;
      }
    if (!isNaN(x))
    {
        alert("Please enter a character.");
        return false;
    }
}
</script>
<form name = "inputForm" action = "" method = "post">
Your Guess: <input name = "userInput" type = "text" size="1" maxlength="1"  />
<input type = "submit"  value = "Check" onclick="return validateInput()"/>
<input type = "submit" name = "newWord" value = "Try another Word"/>
</form>
</body>
</html>

 



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