PHP合成图片、生成文字、居中对齐、画线、矩形、三角形、多边形、图片抗锯齿、不失真 高性能源码示例

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;//18号字体    $fontColor = imagecolorallocate ( $target, 255, 0, 0 );//字体的RGB颜色        $fontWidth = imagefontwidth ( $fontSize );    $fontHeight = imagefontheight ( $fontSize );        $textWidth = $fontWidth * mb_strlen ( $text1 );    $x = ceil ( ($width - $textWidth) / 2 );//计算文字的水平位置        // $textHeight = $fontHeight;    // $y = ceil(($height - $textHeight) / 2);//计算文字的垂直位置        imagettftext ( $target, $fontSize, 0, $x, 190, $fontColor, $font, $text1 );        $textWidth = $fontWidth * mb_strlen ( $text2 );    $x = ceil ( ($width - $textWidth) / 2 );        imagettftext ( $target, $fontSize, 0, $x, 370, $fontColor, $font, $text2 );        $textWidth = $fontWidth * mb_strlen ( $text3 );    $x = ceil ( ($width - $textWidth) / 2 );        imagettftext ( $target, $fontSize, 0, $x, 560, $fontColor, $font, $text3 );//写文字，且水平居中        //imageantialias($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, 300, 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', '哈哈', '嘿嘿', '呵呵' );exit ();