Brian's Blog

<?php
/**
 * @author Taken from the comments in the PHP manuals imageCopyResampled, by ron at korving dot demon dot nl
 * @version 1.0
 * @return void
 * @param string $dst_img
 * @param string $src_img
 * @param integer $dst_x
 * @param integer $dst_y
 * @param integer $src_x
 * @param integer $src_y
 * @param integer $dst_w
 * @param integer $dst_h
 * @param integer $src_w
 * @param integer $src_h
 * @access public
 * @desc Rezised/resamples an image. Faster and higher quality than the regular imageCopyResampled
 * @example imageCopyResampleBicubic('new_img.png', 'old_img.png', 0, 0, 0, 0, 100, 100, 1000, 1000);
 */
function imageCopyResampleBicubic($dst_img, $src_img, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h)
{
    $scaleX = ($src_w - 1) / $dst_w;
    $scaleY = ($src_h - 1) / $dst_h;

    $scaleX2 = $scaleX / 2.0;
    $scaleY2 = $scaleY / 2.0;

    $tc = imageIsTrueColor($src_img);

    for ($y = $src_y; $y < $src_y + $dst_h; $y++) {
        $sY  = $y * $scaleY;
        $siY  = (int) $sY;
        $siY2 = (int) $sY + $scaleY2;

        for ($x = $src_x; $x < $src_x + $dst_w; $x++) {
            $sX  = $x * $scaleX;
            $siX  = (int) $sX;
            $siX2 = (int) $sX + $scaleX2;

            if ($tc) {
                $c1 = imageColorAt($src_img, $siX, $siY2);
                $c2 = imageColorAt($src_img, $siX, $siY);
                $c3 = imageColorAt($src_img, $siX2, $siY2);
                $c4 = imageColorAt($src_img, $siX2, $siY);

                $r = (($c1 + $c2 + $c3 + $c4) >> 2) & 0xFF0000;
                $g = ((($c1 & 0xFF00) + ($c2 & 0xFF00) + ($c3 & 0xFF00) + ($c4 & 0xFF00)) >> 2) & 0xFF00;
                $b = ((($c1 & 0xFF)  + ($c2 & 0xFF)  + ($c3 & 0xFF)  + ($c4 & 0xFF))  >> 2);

                imageSetPixel($dst_img, $dst_x + $x - $src_x, $dst_y + $y - $src_y, $r+$g+$b);
            } else {
                $c1 = imageColorsForIndex($src_img, imageColorAt($src_img, $siX, $siY2));
                $c2 = imageColorsForIndex($src_img, imageColorAt($src_img, $siX, $siY));
                $c3 = imageColorsForIndex($src_img, imageColorAt($src_img, $siX2, $siY2));
                $c4 = imageColorsForIndex($src_img, imageColorAt($src_img, $siX2, $siY));

                $r = ($c1['red']  + $c2['red']  + $c3['red']  + $c4['red']  ) << 14;
                $g = ($c1['green'] + $c2['green'] + $c3['green'] + $c4['green']) << 6;
                $b = ($c1['blue']  + $c2['blue']  + $c3['blue']  + $c4['blue'] ) >> 2;

                imageSetPixel($dst_img, $dst_x + $x - $src_x, $dst_y + $y - $src_y, $r+$g+$b);
            }
        }
    }
}
?>

<?php
/**
 * @author Brian Schmidt
 * @version 1.0
 * @return boolean
 * @param string $str_file
 * @access public
 * @desc Checks if $str_file is a binary file or not.
 * @example $bool_binary = is_binary('example.tar.gz');
 */
function is_binary($str_file)
{
    $str_tmp  = '';
    @$src_file = fopen($str_file, 'rb');
    @$str_tmp = fread($src_file, 256);
    @fclose($src_file);
    if ($str_tmp != '') {
        $str_tmp = str_replace(chr(10), '', $str_tmp);
        $str_tmp = str_replace(chr(13), '', $str_tmp);
        $int_tmp = 0;
        for ($i = 0; $i < strlen($str_tmp); $i++) {
            if (extension_loaded('ctype') && !ctype_print($str_tmp[$i])) {
                $int_tmp++;
            }
            elseif(!eregi("[[:print:]]+", $str_tmp[$i])) {
                $int_tmp++;
            }
        }
        if ($int_tmp > 5) {
            return TRUE;
        }
        else {
            return FALSE;
        }
    }
    else {
        return TRUE;
    }
}
?>

<?php
/**
 * @author Brian Schmidt
 * @version 1.0
 * @return boolean
 * @param string $str_mail
 * @access public
 * @desc Checks if $str_mail is a valid e-mail address with simple regexp
 * @example $bool_mailcheck = is_mail('some.mail.address@example.com');
 */
function is_mail($str_mail)
{
    return (preg_match('/^[-!#$%&\'*+\\.\/0-9=?A-Z^_`{|}~]+@([-0-9A-Z]+\.)+([0-9A-Z]){2,4}$/i', trim($str_mail)));
}
?>

<?php
/**
 * @author Brian Schmidt
 * @version 1.0
 * @return array
 * @param array $arr_extensions
 * @param boolean $bool_inverse
 * @param boolean $bool_showdirs
 * @param string $str_hidestring
 * @access public
 * @desc Returns an array of files in the current folder.
 * @example $arr_files = list_dir(array('.png', '.jpg'));
 */
function list_dir($str_dir = '.', $arr_extensions = NULL, $bool_inverse = FALSE, $bool_showdirs = TRUE, $str_hidestring = NULL)
{
    $arr_dirs = array();
    $arr_files = array();
    $dir = dir($str_dir);
    while ($str_file = $dir->read()) {
        $str_full_path = str_replace(array('//', '/./'), '/', $str_dir . '/' . $str_file);
        if (($str_file == '.') || ((!$bool_showdirs) && is_dir($str_full_path)) || (isset($str_hidestring) && (substr($str_file, 0, strlen($str_hidestring)) == $str_hidestring) && (($bool_showdirs) && ($str_file != '..'))) || (isset($arr_extensions) && is_array($arr_extensions) && !is_dir($str_full_path) && (((!$bool_inverse) && !in_array(strtolower(strrchr($str_file, '.')), $arr_extensions)) || (($bool_inverse) && in_array(strtolower(strrchr($str_file, '.')), $arr_extensions))))) {
            continue;
        }
        if (($bool_showdirs) && is_dir($str_full_path)) {
            $arr_dirs[] = $str_file;
        } else {
            $arr_files[] = $str_file;
        }
    }
    if ($bool_showdirs) {
        natcasesort($arr_dirs);
    }
    natcasesort($arr_files);
    $arr_sorted = ($bool_showdirs) ? array_merge($arr_dirs, $arr_files) : $arr_files;
    return (count($arr_sorted) < 1) ? 0 : $arr_sorted;
}
?>

<?php
/**
 * @author Brian Schmidt
 * @version 1.0
 * @return string
 * @param string $str_mib
 * @access public
 * @desc Converts a MIB (Management Information Base, or SNMP object) to a Cisco style MAC address.
 * @example $str_mac = mib2mac('.1.3.6.1.4.1.9.10.59.1.2.1.1.3.0.8.14.30.222.238 = Gauge32: 5740');
 */
function mib2mac($str_mib)
{
    $str_rev = strrev($str_mib);
    $arr_sep = explode('.', trim(substr($str_rev, (strpos($str_rev, '=') + 1))));
    for ($i = 0; $i < 6; $i++) {
        $str_tmp = dechex(strrev($arr_sep[$i]));
        $arr_tmp[] = (strlen($str_tmp) < 2) ? '0' . $str_tmp : $str_tmp;
    }
    $arr_hex = array_reverse($arr_tmp);
    for ($i = 0; $i < count($arr_hex); $i++) {
        if ($i == 2 || $i == 4) {
            $str_hex .= '.';
        }
        $str_hex .= $arr_hex[$i];
    }
    return $str_hex;
}
?>

<?php
/**
 * @author Brian Schmidt
 * @version 1.0
 * @return string
 * @param integer $length
 * @access public
 * @desc Generates a random string of $int_length ASCII characters.
 * @example $str_pass = random_ascii(10);
 */
function rand_ascii($length = 8)
{
    $chars = array(
        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
    );
    for ($i = 0; $i < $length; $i++) {
        srand((double)microtime()*1000000);
        $char = rand(0, count($chars));
        $string .= $chars[$char];
    }
    return $string;
}
?>

<?php
/**
 * @author Brian Schmidt
 * @version 1.0
 * @return bool
 * @param string $str_mail
 * @access public
 * @desc Checks if $str_mail is a valid e-mail address, both with regular expression and DNS/MX lookup
 * @example $bool_mailcheck = valid_mail('some.mail.address@example.com');
 */
function valid_mail($str_mail)
{
    if (eregi("^[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\\.[a-wyz][a-z](g|l|m|pa|t|u|v|z|fo|seum|me|ro|op|o)?$", $str_mail, $check)) {
        if (getmxrr(substr(strstr($check[0], '@'), 1), $validate_email_temp)) {
            return TRUE;
        }
        if(checkdnsrr(substr(strstr($check[0], '@'), 1), "ANY")) {
            return TRUE;
        }
    }
    return FALSE;
}
?>