图片上打字

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ob_clean();               $realname = "姓名";  $schoolname = "学校";    $idcard = "身份证号";       $image = imagecreatefrompng('certification.png');           // 证书模版图片文件的路径   $red = imagecolorallocate($image,00,00,00);                 // 字体颜色      // imageTTFText("Image", "Font Size", "Rotate Text", "Left Position","Top Position", "Font Color", "Font Name", "Text To Print");  imageTTFText($image, 50, 0, 1110, 1025, $red, '字体路径',$realname);  imageTTFText($image, 50, 0, 1000, 1023, $red, '字体路径', $schoolname);  imageTTFText($image, 55, 0, 900, 810, $red, '字体路径（/usr/share/fonts/truetype/ttf-dejavu/simhei.ttf）', $idcard);       /* If you want to display the file in browser */  header('Content-type: image/png;');  ImagePng($image);  imagedestroy($image);          /* if you want to save the file in the web server */  $filename = 'certificate_aadarsh.png';  ImagePng($image, $filename);  imagedestroy($image);          /* If you want the user to download the file */  $filename = 'certificate_aadarsh.png';  ImagePng($image,$filename);  header('Pragma: public');  header('Cache-Control: public, no-cache');  header('Content-Type: application/octet-stream');  header('Content-Length: ' . filesize($filename));  header('Content-Disposition: attachment; filename="' .   basename($filename) . '"');  header('Content-Transfer-Encoding: binary');  readfile($filename);  imagedestroy($image);