$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);

 /* 直接显示在浏览器 */
header('Content-type: image/png;');
ImagePng($image);
imagedestroy($image);


/* 如果需要保存 */
$filename = 'certificate_aadarsh.png';
ImagePng($image, $filename);
imagedestroy($image);


/* 如果需要下载 */
$filename = 'certificate_aadarsh.png';
ImagePng($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);

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