PHP Authentication code PHP Validation code PHP Verification code PHP verification site

Purpose of Study:
Block machine requests to ensure that the business is not disturbed by machine submission requests.
Why to block:
In General Service-side business, write requests consume much more than read requests.
Technical points:
1. Implementation of the basemap and adding interference elements
2. Generate Validation Content
3. Verify that the content is stored on the server
4. Verifying the efficacy of the content

To implement a basemap:

Code:

    
     $img = imagecreatetruecolor(100,30);//大小$bgColor = imagecolorallocate($img,0x00,0x00,0x00);//背景颜色imagefill($img,0,0,$bgColor);//填充颜色header('content-type: image/png');imagepng($img);//销毁imagedestroy($img);

'). addclass (' pre-numbering '). Hide (); $ (this). addclass (' has-numbering '). Parent (). append ($numbering); for (i = 1; i <= lines; i++) {$numbering. Append ($ ('

'). Text (i)); }; $numbering. FadeIn (1700); }); });

The above on the introduction of PHP production verification code, including the verification Code, PHP content, I hope that the PHP tutorial interested in a friend helpful.

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