根据TextArea传来的值,自动折行,并合成图片

//$bigImgPath = $_REQUEST['image'];//背景图$bigImgPath = 'opcity.png';//背景图$new_file = "../upload/";//上传路径if($_REQUEST['content']){    $font = 'font.ttf';//字体    $fontSize = 30;   //字体大小    $circleSize = 0; //旋转角度    $left = 20;      //左边距    $top = 60;      //顶边距    $content = autowrap($fontSize,0,$font,$_REQUEST['content'],419);    //新的判断行数,行数不同,选择透明的背景高度也不一样    $count = count(explode("\n",$content));    if($count==1){        $bigImgPath = '../images/opcity1.png';//背景图    }elseif($count==2){        $bigImgPath = '../images/opcity2.png';//背景图    }elseif($count==3){        $bigImgPath = '../images/opcity3.png';//背景图    }else{        $bigImgPath = '../images/opcity4.png';//背景图    }    $img = imagecreatefromstring(file_get_contents($bigImgPath));    $black = imagecolorallocate($img, 0, 0, 0);//字体颜色 RGB    $slide_color = imagecolorallocate($img, 255, 255, 255);//字体颜色 RGB    imagesavealpha($img,true);//这里很重要 意思是不要丢了$sourePic图像的透明色;    imagefttext($img, $fontSize, $circleSize, $left+3, $top, $slide_color, $font,'＂'.$content.'＂');//假装是一个描边    imagefttext($img, $fontSize, $circleSize, $left-3, $top, $slide_color, $font,'＂'.$content.'＂');    imagefttext($img, $fontSize, $circleSize, $left, $top, $black, $font,'＂'.$content.'＂');    list($bgWidth, $bgHight, $bgType) = getimagesize($bigImgPath);    header('Content-Type:image/png');    imagepng($img,$new_file.$_REQUEST['filename']);    echo json_encode($new_file.$_REQUEST['filename']) ;}function autowrap($fontsize, $angle, $fontface, $string, $width) {// 这几个变量分别是 字体大小, 角度, 字体名称, 字符串, 预设宽度    $content = "";    // 将字符串拆分成一个个单字 保存到数组 letter 中    for ($i=0;$i<mb_strlen($string,'UTF8');$i++) {        $letter[] = mb_substr($string, $i, 1,'UTF8');    }    foreach ($letter as $l) {        $teststr = $content." ".$l;        $testbox = imagettfbbox($fontsize, $angle, $fontface, $teststr);        // 判断拼接后的字符串是否超过预设的宽度        if (($testbox[2] > $width) && ($content !== "")) {            $content .= "\n";        }        $content .= $l;    }    return $content;}