function barCode(
$p_barcodeType, // Type of barcode to be generated
$p_origText, // Text to be generated as barcode
$p_xDim, // smallest ellement width
$p_w2n, // wide to narrow factor
$p_charGap, // Intercharacter gap width. usually the same as xDim
$p_invert, // Whether or not invert starting bar colors
$p_charHeight, // height in pixels of a single character
$p_imgType, // image type output
$p_drawLabel, // Whether or not include a text label below barcode
$p_rotationAngle, // Barcode Image rotation angle
$p_check, // Whether or not include check digit
$p_toFile, // Whether or not write to file
$p_fileName // File name to use in case of writing to file
) {
if ($p_rotationAngle < BC_ROTATE_0 || $p_rotationAngle > BC_ROTATE_270) {
$p_rotationAngle = BC_ROTATE_0;
}
$p_rotationAngle = $p_rotationAngle * 90;
$font = 5; // font type. GD dependent
$p_w2n = checkWideToNarrow($p_barcodeType, $p_w2n);
$p_charGap = checkCharGap($p_barcodeType, $p_charGap);
$p_check = checkCheckDigit($p_barcodeType, $p_check);
$quietZone = 10 * $p_xDim; // safe white zone before and after the barcode
if ($p_check) {
$textCheck = getCheckDigit($p_barcodeType, $p_origText);
} else {
$textCheck = $p_origText;
}
$text2bar = getBarcodeText($p_barcodeType, $textCheck); // format text
$charCount = getCharCount($p_barcodeType, $text2bar); // number of symbols
// image height & width
$imgWidth = getBarcodeLength($p_barcodeType, $text2bar, $p_xDim, $p_w2n, $quietZone, $p_charGap);
$imgHeight = $p_charHeight;
$hMidHeight = floor($p_charHeight / 2);
$hTrackWidth = floor($p_charHeight / 4);
if (($p_charHeight - $hTrackWidth) % 2 != 0) {
$hTrackWidth = $hTrackWidth + 1;
}
$hAscWidth = floor(($p_charHeight - $hTrackWidth) / 2);
if ($p_drawLabel) { // increase image height when adding label
$imgHeight = $imgHeight + imagefontheight($font);
}
$extraWidth = imagefontwidth($font) * strlen($p_origText) - $imgWidth;
if ($extraWidth > 0) {
$quietZone = $quietZone + $extraWidth / 2 + 1;
$imgWidth = getBarcodeLength($p_barcodeType, $text2bar, $p_xDim, $p_w2n, $quietZone, $p_charGap);
}
$im = @imagecreate($imgWidth, $imgHeight) or die("Cannot Initialize new GD image stream");
$xPos = $quietZone; // starting bar X position
$bgColor = imagecolorallocate($im, 255, 255, 255); // white background
$blackColor = imagecolorallocate($im, 0, 0, 0);
$whiteColor = imagecolorallocate($im, 255, 255, 255);
$black = !$p_invert; // what color is the first bar?
for ($j = 0; $j < $charCount; $j++) { // traverse string
$currChar = getSpec($p_barcodeType, $text2bar, $j); // get symbol spec.
for ($i = 0; $i < strlen($currChar); $i++) { // traverse symbol spec.
if ($black) { // what color is next bar?
$barColor = $blackColor;
} else {
$barColor = $whiteColor;
}
if ($currChar[$i] == "n") { // draw a narrow bar
$xPos1 = $xPos + $p_xDim - 1;
$yPos = 0;
$yPos1 = $p_charHeight - 1;
} elseif ($currChar[$i] == "w") { // draw a wide bar
$xPos1 = $xPos + $p_xDim * $p_w2n - 1;
$yPos = 0;
$yPos1 = $p_charHeight - 1;
} elseif ($currChar[$i] == "1") { // draw a narrow black bar
$xPos1 = $xPos + $p_xDim - 1;
$barColor = $p_invert ? $whiteColor : $blackColor;
$yPos = 0;
$yPos1 = $p_charHeight - 1;
} elseif ($currChar[$i] == "0") { // draw a narrow white space
$xPos1 = $xPos + $p_xDim - 1;
$barColor = $p_invert ? $blackColor : $whiteColor;
$yPos = 0;
$yPos1 = $p_charHeight - 1;
} elseif ($currChar[$i] == "f") { // draw a full vertical bar
$xPos1 = $xPos + $p_xDim - 1;
$yPos = 0;
$yPos1 = $p_charHeight - 1;
} elseif ($currChar[$i] == "u") { // draw a mid upper vertical bar
$xPos1 = $xPos + $p_xDim - 1;
$yPos = 0;
$yPos1 = $hMidHeight - 1;
} elseif ($currChar[$i] == "l") { // draw a mid lower vertical bar
$xPos1 = $xPos + $p_xDim - 1;
$yPos = $hMidHeight;
$yPos1 = $p_charHeight - 1;
} elseif ($currChar[$i] == "t") { // draw a track only vertical bar
$xPos1 = $xPos + $p_xDim - 1;
$yPos = $hAscWidth;
$yPos1 = $hAscWidth + $hTrackWidth - 1;
} elseif ($currChar[$i] == "a") { // draw a track & ascender vertical bar
$xPos1 = $xPos + $p_xDim - 1;
$yPos = 0;
$yPos1 = $hAscWidth + $hTrackWidth - 1;
} elseif ($currChar[$i] == "d") { // draw a track & descender vertical bar
$xPos1 = $xPos + $p_xDim - 1;
$yPos = $hAscWidth;
$yPos1 = $p_charHeight - 1;
}
if ($currChar[$i] != " ") {
imagefilledrectangle($im, $xPos, $yPos, $xPos1, $yPos1, $barColor);
$black = !$black;
$xPos = $xPos1 + 1;
}
}
// draw intercharacter gap if gap lenght > 0
if ($j < $charCount - 1 && $p_charGap > 0) { // do not draw last gap
if ($black) { // it is supposed to be always false but you never know
$barColor = $blackColor;
} else {
$barColor = $whiteColor;
}
$xPos1 = $xPos + $p_charGap - 1;
$yPos = 0;
$yPos1 = $p_charHeight - 1;
imagefilledrectangle($im, $xPos, $yPos, $xPos1, $yPos1, $barColor);
$black = !$black;
$xPos = $xPos1 + 1;
}
}
if ($p_drawLabel) { // draw text label
$imgTextWidth = imagefontwidth($font) * strlen($p_origText);
$xText = ($imgWidth - $imgTextWidth) / 2;
imagestring($im, $font, $xText, $p_charHeight, $p_origText, $blackColor);
}
$functionName = barcodeImgFunction($p_imgType); // get php image output function
if ($p_toFile) {
$fileExt = barcodeFileExt($p_imgType); // get file extension
$functionName(imagerotate($im, $p_rotationAngle, $whiteColor), $p_fileName . "." . $fileExt); // Automatic image type output
} else {
$headerContent = barcodeHeaderContent($p_imgType); // get header type
header("Content-type: $headerContent"); // Automatic content type output
$functionName(imagerotate($im, $p_rotationAngle, $whiteColor)); // Automatic image type output
}
imagedestroy($im); // free image resource
}
$type = BC_TYPE_POSTNET;
$xDim = 1;
$gap = $xDim;
$w2n = 3;
$qz = 10 * $xDim;
$check = false;
$check = checkCheckDigit($type, $check);
$tOrig = "801221905";
if ($check) {
$txtCK = getCheckDigit($type, $tOrig);
} else {
$txtCK = $tOrig;
}
$text = getBarcodeText($type, $txtCK);
$w2n = checkWideToNarrow($type, $w2n);
$gap = checkCharGap($type, $gap);
$iwide = getBarcodeLength($type, $text, $xDim, $w2n, $qz, $gap);
$len = getCharCount($type, $text);
echo "TEXT: '{$tOrig}'<br>";
echo "TEXTCK: '{$txtCK}'<br>";
echo "TEXT2BAR: '{$text}'<br>";
echo "XDIM: {$xDim}<br>";
echo "W2N: {$w2n}<br>";
echo "GAP: {$gap}<br>";
echo "QZ: {$qz}<br>";
echo "IMG WIDTH: {$iwide}<br>";
echo "LEN: {$len}<br>";
for ($i = 0; $i < $len; $i++) {
echo "'" . getSpec($type, $text, $i) . "'<br>";
}
echo "</pre>\n";