function generateImg($source, $text1, $text2, $text3, $font = './msyhbd.ttf') {

    $date = '' . date ( 'Ymd' ) . '/';

    $img = $date . md5 ( $source . $text1 . $text2 . $text3 ) . '.jpg';

    if (file_exists ( './' . $img )) {

        return $img;

    }

    $main = imagecreatefromjpeg ( $source );

    $width = imagesx ( $main );

    $height = imagesy ( $main );

    $target = imagecreatetruecolor ( $width, $height );

    $white = imagecolorallocate ( $target, 255, 255, 255 );

    imagefill ( $target, 0, 0, $white );

    imagecopyresampled ( $target, $main, 0, 0, 0, 0, $width, $height, $width, $height );

    $fontSize = 18;//像素字体

    $fontColor = imagecolorallocate ( $target, 255, 0, 0 );//字的RGB颜色

    $fontBox = imagettfbbox($fontSize, 0, $font, $text1);//文字水平居中实质

    imagettftext ( $target, $fontSize, 0, ceil(($width - $fontBox[2]) / 2), 190, $fontColor, $font, $text1 );

    $fontBox = imagettfbbox($fontSize, 0, $font, $text2);

    imagettftext ( $target, $fontSize, 0, ceil(($width - $fontBox[2]) / 2), 370, $fontColor, $font, $text2 );

    $fontBox = imagettfbbox($fontSize, 0, $font, $text3);

    imagettftext ( $target, $fontSize, 0, ceil(($width - $fontBox[2]) / 2), 560, $fontColor, $font, $text3 );

    //imageantialias($target, true);//抗锯齿，有些PHP版本有问题，谨慎使用

    imagefilledpolygon ( $target, array (10 + 0, 0 + 142, 0, 12 + 142, 20 + 0, 12 + 142), 3, $fontColor );//画三角形

    imageline($target, 100, 200, 20, 142, $fontColor);//画线

    imagefilledrectangle ( $target, 50, 100, 250, 150, $fontColor );//画矩形

    //bof of 合成图片

    $child1 = imagecreatefromjpeg ( 'http://gtms01.alicdn.com/tps/i1/T1N0pxFEhaXXXxK1nM-357-88.jpg' );

    imagecopymerge ( $target, $child1, 0, 400, 0, 0, imagesx ( $child1 ), imagesy ( $child1 ), 100 );

    //eof of 合成图片

    @mkdir ( './' . $date );

    imagejpeg ( $target, './' . $img, 95 );

    imagedestroy ( $main );

    imagedestroy ( $target );

    imagedestroy ( $child1 );

    return $img;

}

//http://my.oschina.net/cart/

generateImg ( 'http://1.popular.sinaapp.com/munv/pic.jpg', 'my.oschina.net/cart', 'PHP文字水平居中', '3个字' );

exit ();