使用gd库在php上居中图像
[英]Centering image on php with gd library
问题描述
hey guys i have been doing some code on php ..but its not giving me the output which i expected ..The code is 
嗨，大家好，我一直在做一些关于php的代码。但是它没有给我我期望的输出。
html code HTML代码
<html>
<body>
<form action="images.php" method="post">
Enter image Name :<input type="text" name="imagename">
<br></br>
<input type="submit" name="sumbit">
<br></br>
</form>
</body>
</html>
In this html code user is allowded to type his name so that the image is generated according to the name.. 在此html代码中，允许用户键入其名称，以便根据该名称生成图像。
the php code PHP代码
<?php
$name = $_POST['imagename'];
if($_POST['imagename'] != ''){
header("Content-Type: image/png");
$name = $_POST['imagename'];
$im = @imagecreate(800,600);
$background_color = imagecolorallocate($im, 0xFF, 0xCC, 0xDD);
$text_color = imagecolorallocate($im, 133, 14, 91);
imagestring($im, 5, 300, 300, "$name", $text_color);
imagepng($im);
imagedestroy($im);
}
else echo "no image created";
?>
This php code generates the image accrding to the name given.. 此php代码根据给定的名称生成图像。
The image is generated fine with this piece of codes but what i need is that the image created must appear on the center of the browser ...i have tried it using <img src="file.php> on the html file..but it didnt worked .. 使用这段代码可以很好地生成图像，但是我需要创建的图像必须出现在浏览器的中心...我已经尝试使用html文件上的<img src="file.php> 。但是没有用..
It will be really helpful if you guys find me a solution..Thanks in advance 如果你们找到我一个解决方案，这将非常有帮助。
2 个解决方案
解决方案1
1 2014-05-22 15:36:16
If you want to center your image in the browser, you need html and css. 如果要在浏览器中居中放置图像，则需要html和CSS。
I would recommend that instead of displaying the image directly using header("Content-Type: image/png"); 我建议不要使用header("Content-Type: image/png");直接显示图像header("Content-Type: image/png"); , you save the image to a file. ，将图像保存到文件中。
Then your script can output html and include the image in an image tag or as a background image. 然后，您的脚本可以输出html，并将图像包含在图像标签中或作为背景图像。 That image can be centered in the browser easily using css. 使用CSS可以轻松地在浏览器中将图像居中。
解决方案2
0 2014-05-22 14:19:48
Here you'll find an example of how to center text in a handmade image. 在这里，您将找到一个示例，说明如何在手工图像中居中放置文本。 Citing that page, you should do: 引用该页面，您应该执行以下操作：
<?php
$fw = imagefontwidth(5); // width of a character
$l = strlen("$name"); // number of characters
$tw = $l * $fw; // text width
$iw = imagesx($im); // image width, 800 for your case
$xpos = ($iw - $tw) / 2;
$ypos = 10;
imagestring ($im, 5, $xpos, $ypos, "$name", $color);
//...
?>
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