PHP imagecreate - 生成自定義圖片

PHP imagecreate - 生成自定義圖片

該方法是根據字符的長度改變字體的大小

function generateCover($content,$author,$date)//$content名稱  $author做者  $date日期
{
    $width = 640;
    $height = 360;
    $myImage = ImageCreate($width,$height); //參數爲寬度和高度
    $white = ImageColorAllocate($myImage, 255, 255, 255);//白色
    $blue = ImageColorAllocate($myImage, 0, 0, 255);//藍色
    imagefill($myImage, 0, 0, $blue);//藍色背景
    $font = "/src/style/fonts/msyh.ttf";//下載的字體，可自行百度搜下載引用
    $filePathDir = "file/cover/" . date("Ymd") . '/';
    if (!is_dir($filePathDir)) {
        mkdir($filePathDir, 0777, true);//建立圖片的存儲文件夾
    }
    $filePath   = $filePathDir.md5(time()).'.jpg';//圖片的路徑
    $date = date("Y-m-d",strtotime($date));
    if(mb_strlen($content) <= 10) {//字符長度大於等於10
        contentlenth1($myImage,$content,$author,$date,$font,$width,$height,$white,$filePath);
    }else {
        contentlenth2($myImage,$content,$author,$date,$font,$width,$height,$white,$filePath);
    }
    return $filePath;
}

//標題長度小於等於10

function contentlenth1($myImage,$string,$author,$date,$font,$width,$height,$white,$filePath)
{
    $textlen = mb_strlen($string);
    $value = $textlen - 4;
    if ($value < 0)
        $value = 0;
    $fontsize = 3.5 * (6 - $value) + 30;
    $fontwidth = $fontsize * 1.35;
    $fontheight = $fontsize * 1;
    for ($i=0;$i<mb_strlen($string);$i++) {
        $letter[] = mb_substr($string, $i, 1);
    }
    imagettftext($myImage, $fontsize, 0, ($width-$fontwidth*mb_strlen($string))/2, ($height * 0.7 + $fontheight) / 2, $white, $font, $string);
    $authorrHeight = ($height * 0.15 + 20)/ 2 + $height * 0.55;
    $dateHeight = ($height * 0.15 + 20) / 2 + $height * 0.75;
    imagettftext($myImage, 20, 0, ($width-20*1.35*mb_strlen($author))/2, $authorrHeight, $white, $font, $author);
    imagettftext($myImage, 20, 0, ($width-0.72*20*strlen($date))/2, $dateHeight, $white, $font, $date);
    imagepng($myImage,$filePath);
}

//標題長度超過10

function contentlenth2($myImage,$string,$author,$date,$font,$width,$height,$white,$filePath)
{
    $toplen = ceil(mb_strlen($string) * 0.4);
    $texttop = mb_substr($string, 0, $toplen);
    $texttoplen = mb_strlen($texttop);
    $value = $texttoplen - 4;
    if ($value < 0)
        $value = 0;
    $fontsize = 2 * (6 - $value) + 30;
    $fontwidth = $fontsize * 1.35;
    $fontheight = $fontsize * 1;
    imagettftext($myImage, $fontsize, 0, ($width-$fontwidth*mb_strlen($texttop))/2,
        ($height * 0.7 + $fontheight) / 2 - $fontsize, $white, $font, $texttop);
    $textbottom = mb_substr($string, $toplen, mb_strlen($string) - $toplen);
    imagettftext($myImage, $fontsize, 0, ($width-$fontwidth*mb_strlen($textbottom))/2,
        ($height * 0.7 + $fontheight) / 2 + $fontsize, $white, $font, $textbottom);
    $authorrHeight = ($height * 0.15 + 20)/ 2 + $height * 0.6;
    $dateHeight = ($height * 0.15 + 20) / 2 + $height * 0.75;
    imagettftext($myImage, 20, 0, ($width-20*1.35*mb_strlen($author))/2, $authorrHeight, $white, $font, $author);
    imagettftext($myImage, 20, 0, ($width-20*0.72*strlen($date))/2, $dateHeight, $white, $font, $date);
    imagepng($myImage,$filePath);
}

效果圖：