php function makeGoodSite str if substr str http str substr str if sub

<?php
    function makeGoodSite($str)
    {
        if (substr($str, 0, 7) == "http://")
        {
                $str = substr($str, 7);
        }
                
        if (substr($str, 0, 4) == "www.")
        {
                $str = substr($str, 4);
        }
        
        $answer = "http://www.".$str;
        
        return $answer;
    }

    function GetFileList($d)
    {
        $answer = array();
        
        if ($d != '')
        {
            chdir($d);
        }
        
        $dir = opendir (".");
        while ($file = readdir ($dir)) 
        {
            if (preg_match('/[0-9].TXT/', $file) or preg_match('/[0-9].txt/', $file))
            {
                $file = substr($file, 0, -4);
                array_push ($answer, $file);
            }
        }
        closedir ($dir);

        return $answer;
    }
    
    function GetTextFileContent($f)
    {
        
        $file = './' . $f . '.txt';
        $info = [];
        
        $handle = fopen($file, "r");
        while (!feof($handle)) {
            $buffer = fgets($handle, 4096);
            
            array_push($info, $buffer);
        }
 
        $answer = [
            'FIO' => $info[1],
            'address' => makeGoodSite($info[3]),
            'mail' => $info[0],
            'Date' => $info[2]
        ];
        
        return $answer;
    }
   
    function showData($input)
    {
        echo '<tr><td>'. $input['FIO'] .'</td><td>'. $input['mail'] .'</td><td>'. $input['address'] .'</td><td>' .$input['Date'] .'</td></tr>';
    }
    
    function printData($input)
    {
        echo '<table border="0"><tr><td>FIO</td><td>E-Mail</td><td>Web site</td><td>Date</td></tr>';
     
        array_map("showData",$input);
        
        echo '</table>';
    }
    
    function together($d)
    {
        printData(array_map('GetTextFileContent', GetFileList($d)));
    }
    
    function comCheck($input)
    {
        if (substr($input['mail'], -6, -2) == '.com')
        {
                return true;
        }
        
        return false;
    }
    
    function comTest($d)
    {
        $local = array_map('GetTextFileContent', GetFileList($d));
        $info = array_filter($local, 'comCheck');
        printData($info);
    }
    
    function cmp($a, $b)
    {
        if (strlen($a['mail']) == strlen($b['mail']))
        {
            return 0;
        }
            
        if (strlen($a['mail']) < strlen($b['mail']))
        {
            return -1;
        }
            
        return 1;
    }
    
    function sortBymailLength($d)
    {
        $local = array_map('GetTextFileContent', GetFileList($d));
        usort($local, 'cmp');
        printData($local);
    }
    
    function makeNewArray($d)
    {
        $local = array_map('GetTextFileContent', GetFileList($d));
        
        $newArray = [];
        for ($i=0; $i < count($local); $i += 1)
        {
            $newArray[$local[$i]['mail']] = $local[$i];
            unset($newArray[$local[$i]['mail']]['mail']);
        }
    }
    
    function comTestAndSort($d)
    {
        $local = array_map('GetTextFileContent', GetFileList($d));
        usort($local, 'cmp');
        $info = array_filter($local, 'comCheck');
        printData($info);
    }
    
    comTestAndSort('123');