PHP imagecreate - 生成自定义图片

该方法是根据字符的长度改变字体的大小

function generateCover($content,$author,$date)//$content名称  $author作者  $date日期
{$width = 640;$height = 360;$myImage = ImageCreate($width,$height); //参数为宽度和高度$white = ImageColorAllocate($myImage, 255, 255, 255);//白色$blue = ImageColorAllocate($myImage, 0, 0, 255);//蓝色imagefill($myImage, 0, 0, $blue);//蓝色背景$font = "/src/style/fonts/msyh.ttf";//下载的字体，可自行百度搜下载引用$filePathDir = "file/cover/" . date("Ymd") . '/';if (!is_dir($filePathDir)) {mkdir($filePathDir, 0777, true);//创建图片的存储文件夹}$filePath   = $filePathDir.md5(time()).'.jpg';//图片的路径$date = date("Y-m-d",strtotime($date));if(mb_strlen($content) <= 10) {//字符长度大于等于10contentlenth1($myImage,$content,$author,$date,$font,$width,$height,$white,$filePath);}else {contentlenth2($myImage,$content,$author,$date,$font,$width,$height,$white,$filePath);}return $filePath;
}

//标题长度小于等于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);
}

//标题长度超过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);
}

效果图：