PHP根据文章标题生成缩略图，并居中展示

<?php function attach_text_logo($imgFilePath, $textLogo) { $hh = 16; if(mb_strlen($textLogo,'utf-8')>$hh){ $newtextLogo = mb_substr($textLogo,0,$hh,'utf-8') . "\n" . mb_substr($textLogo,$hh,$hh,'utf-8'); }else{ $newtextLogo = $textLogo; } //创建图片的实例 $im = imagecreatefromstring(file_get_contents($imgFilePath)); list($width, $height, $type, $attr) = getimagesize($imgFilePath); // 水印字体颜色 $textColor = imagecolorallocate($im, 0x00, 0x00, 0x00); // 水印字体大小 $textSize = 18; // 下载地址（放到本地）：https://github.com/JotJunior/PHP-Boleto-ZF2/blob/master/public/assets/fonts/arial.ttf $fontFile = './msyhbd.ttf'; $fontBox = imagettfbbox($textSize, 0, $fontFile, $newtextLogo);//获取文字所需的尺寸大小 // 居中算法 $fwidth = ceil(($width - $fontBox[2]) / 2); $fheight = ceil(($height - $fontBox[1] - $fontBox[7]) / 2); // 添加文字水印 imagefttext($im, $textSize, 0, $fwidth, $fheight, $textColor, $fontFile, $newtextLogo); // imagefttext($im, $textSize, 0, 30, 110, $textColor, $fontFile, $newtextLogo); switch($type) { case 1: imagegif($im); break; case 2: imagejpeg($im); break; case 3: imagepng($im); break; case 6: imagewbmp($im); break; } imagedestroy($im); } $txt = $_GET['txt']; //$txt = iconv('gbk','utf-8',$txt); if($txt){ header('Content-Type: image/jpg'); $bgimg = './bgimg/back.jpg'; attach_text_logo($bgimg, $txt); }