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mix_text()

Description

Utility function to randomly scramble string

Parameters

ColumnTypeDefaultDescription
$string null|string Text string to scramble
$recurse boolean true: string { global $mixcache Optionally prevent recursion (maybe called by another mix unction)
$mime_types_by_extension;

Return

string

Location

include/migration_functions.php lines 287 to 408

Definition

 
function mix_text(?string $string, bool $recurse=true): string
    {
    global $mixcache, $mime_types_by_extension;

    $string ??= '';
    if (trim($string) === '')
        {
        return '';
        }

    if(isset($mixcache[md5($string)]))
        {
        return $mixcache[md5($string)];
        }
    
    debug( "Converting string<br/>" . $string . ", recurse=" . ($recurse ? "TRUE" : "FALSE"));

    // Check if another function is better
    if(validateDatetime($string) && $recurse)
        {
        debug("This is a date - calling mix_date()");
        return mix_date($string);
        }
    elseif(strpos($string,"http") === 0  && $recurse)
        {
        debug("This is a URL - calling mix_url()");
        return mix_url($string);
        }
    elseif(in_array(mb_substr($string,strrpos($string,".")),$mime_types_by_extension) && $recurse)
        {
        debug("This is a filename - calling mix_filename()");
        return mix_filename($string);
        }
    
    $numbers = '0123456789';
    $uppercons = 'BCDFGHJKLMNPQRSTVWXZ';
    $uppervowels = 'AEIOUY';
    $lowercons = 'bcdfghjklmnpqrstvwxz';
    $lowervowels = 'aeiouy';
    $noreplace = "'\".,<>#-_&\$£:;^?!@+()*% \n";

    $newstring = "";
    $bytelength = strlen($string);
    $mbytelength = mb_strlen($string);

    // Simple conversion if numbers
    if($bytelength == $mbytelength && (string)(int)$string == $string)
        {
        $newstring =  mt_rand(0,(int)$string);
        }
    else
        {
        // Process each character
        for($i=0;$i<$mbytelength;$i++)
            {
            $oldchar = mb_substr($string,$i,1);

            if($i > 3 && strpos($noreplace,$oldchar) === false)
                {
                // Randomly add or remove character after first
                $randaction = mt_rand(0,10);
                if($randaction == 0)
                    {
                    // Skip a character
                    $i++;
                    }
                elseif($randaction == 1)
                    {
                    // Add a character
                    $i--;
                    }
                }

            if($i >= $mbytelength || $oldchar == "")
                {
                $newstring .=  substr(str_shuffle($lowervowels . $lowercons), 0,1);   
                }
            elseif(strpos($noreplace,$oldchar) !== false)
                {
                $newstring .= $oldchar;
                }
            elseif(strlen($oldchar)==1)
                {
                // Non- multibyte
                if(strpos($lowercons,$oldchar) !== false)
                    {
                    $newchar = substr(str_shuffle($lowercons), 0,1);
                    }
                elseif(strpos($uppercons,$oldchar) !== false)
                    {
                    $newchar = substr(str_shuffle($uppercons), 0,1);
                    }
                elseif(strpos($lowervowels,$oldchar) !== false)
                    {
                    $newchar = substr(str_shuffle($lowervowels), 0,1);
                    }
                elseif(strpos($uppervowels,$oldchar) !== false)
                    {
                    $newchar = substr(str_shuffle($uppervowels), 0,1);
                    }                    
                elseif(strpos($numbers,$oldchar) !== false)
                    {
                    $newchar = substr(str_shuffle($numbers), 0,1);
                    }
                else
                    {
                    $newchar = substr(str_shuffle($noreplace), 0,1);
                    }
                $newstring .= $newchar;        
                }                         
            else
                {
                $newchar = random_char();
                $newstring .= $newchar;   
                } // End of multibyte conversion
            }
        }

    // Update cache
    $mixcache[md5($string)] = $newstring;
    return $newstring;
    }

This article was last updated 17th November 2024 15:35 Europe/London time based on the source file dated 15th April 2024 16:05 Europe/London time.