What should I do if php fails to create an image?

The solution to the failure of php to create an image: first open the corresponding PHP file; then add the code "ob_clean();" before the header; and finally save the changes.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

Solve the problem of GD images generated by php not being displayed

First look at the code that generates the image

<?php
$img   = @imagecreate(110, 20) or die("GD图像创建失败！");
$bg    = imagecolorallocate($img, 255, 255, 255);
$text_color = imagecolorallocate($img, 55, 55, 55);
imagestring($img, 5, 0, 3, "I&#39;m leo", $text_color);
header(&#39;Content-Type:image/png&#39;);
imagepng($img);
imagedestroy($img);

The above code is not displayed in the browser. After many calls, the image It cannot be displayed in the browser, only a small cracked icon that has not been loaded successfully.

Solution

After many searches, a function solved this problem.

That is to add the following code before the header:

ob_clean(); // --清空（擦掉）输出缓冲区

Note: Although the problem is solved, I still don’t understand why I need to do this. Could it be that after multiple calls, the buffer is still affected? If anyone knows, please leave a message with detailed explanation. Thank you!

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