PHP failed to draw the picture, using clear cache Ob_clean can be resolved.

Images cannot be generated properly when you create a picture using PHP

header("Content-type: image/png");$img=imagecreatetruecolor(200,200);imagepng($img);imagedestroy($img);

The appearance of the picture is actually like this:

After the cache is cleared, it will be displayed correctly, join
Ob_clean ();

The code is as follows:

    
    ob_clean();header("Content-type: image/png");$img=imagecreatetruecolor(200,200);imagepng($img);imagedestroy($img);?>

The above describes the PHP drawing failed, using clear cache Ob_clean can be resolved. , including the aspects of the content, want to be interested in PHP tutorial friends helpful.

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