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2025-09-22 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >
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Editor to share with you what to do if the CAPTCHA cannot be displayed in PHP. I believe most people don't know much about it, so share this article for your reference. I hope you will gain a lot after reading this article. Let's learn about it together.
The reason why PHP CAPTCHA can not be displayed and its solution
First, if it is utf-8, it is possible that BOM has not been cleared
Second, there is output before Header ("Content-type: image/PNG")
Third, the first line of PHP hides the code, such as spaces, carriage returns and so on. Resolution code:
$image_width=70; / / set the width of the image $image_height=18; / / set the height of the image $new_number=$_GET [num]; / / $new_number=5;$num_image=imagecreate ($image_width,$image_height); / / create a canvas imagecolorallocate ($num_image,255255255); / / set the color of the canvas $black=imagecolorallocate ($num_image,0,0,0); / * / for
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