Network verification code automatically generated program-php Tutorial

The network verification code automatically generates a program. Where does the network verification code automatically generate a program? How to join php?

Reply to discussion (solution)

Use google directly.
Https://developers.google.com/recaptcha/

Search for more information on the Internet.

Use google directly.
Https://developers.google.com/recaptcha/
Is it okay to call google's api?

Yes. the security factor for calling google APIs is quite high.

Class captcha {
//
Private $ captcha_key = 'captcha _ code'; // subscript of the element in the session
Private $ width; // image width
Private $ height; // Image height

/**
* Constructor
* @ Param $ width integer width
* @ Param $ height integer height
*/
Public function _ construct (){
}

Public function generate ($ width, $ height ){
// Initialize attributes
$ This-> width = $ width;
$ This-> height = $ height;
// Create a verification code
$ Chars = array_merge (range ('A', 'z'), range ('A', 'z'), range ('1', '9 '));
$ Rand_keys = array_rand ($ chars, 4 );
Shuffle ($ rand_keys );
Foreach ($ rand_keys as $ key ){
$ Char [] = $ chars [$ key];
}

// Put it into the session
@ Session_start ();
// Connect the string and save it to the session
// Implode (). If the first parameter is not specified, it indicates a null character connection.
$ _ SESSION [$ this-> captcha_key] = implode ($ char );


// Process the image
// Step 1
$ Img = imagecreatetruecolor ($ this-> width, $ this-> height );
// Step 2
// Fill in the background
// First design the color and assign it to the image.
$ Backgroud_color = imagecolorallocate ($ img, mt_rand (180,255), mt_rand (180,255), mt_rand (180,255 ));
// Fill in the image
Imagefill ($ img, 0, 0, $ backgroud_color );


// Add some interference lines
// First assign the line segment color
For ($ I = 0; $ I <5; $ I ++ ){
$ Line_color = imagecolorallocate ($ img, mt_rand (150,200), mt_rand (150,200), mt_rand (150,200 ));
// Draw a line
Imageline ($ img, mt_rand (0, $ this-> width-1), mt_rand (0, $ this-> height-1), mt_rand (0, $ this-> width-1), mt_rand (0, $ this-> height-1), $ line_color );
}

// Add interference pixels
For ($ I = 0; I I <100; $ I ++ ){
$ Pixel_color = imagecolorallocate ($ img, mt_rand (150,200), mt_rand (150,200), mt_rand (150,200 ));
Imagesetpixel ($ img, mt_rand (0, $ this-> width-1), mt_rand (0, $ this-> height-1), $ pixel_color );
}




// Obtain the colors that can be used on resources first
$ String_color = imagecolorallocate ($ img, mt_rand (80,150), mt_rand (80,150), mt_rand (80,150 ));//
// Write the obtained string to the image
Imagestring ($ img, 5, 55, 2, $ _ SESSION [$ this-> captcha_key], $ string_color );
// Step 3
// Set the response header. the content to be output to the browser is in png format.
Header ('content-Type: image/png ');
Imagepng ($ img); // if there is no second parameter, it indicates the meaning of the output.
// Step 4
Imagedestroy ($ img );

}

/**
* Determine whether the verification code submitted by the user is correct
* @ Param $ code string data submitted by the user
* @ Return: If bool is consistent, true is returned. if not, false is returned.
*/
Public function checkCaptcha ($ code ){
Return strtoupper ($ code) = strtoupper ($ _ SESSION [$ this-> captcha_key]);
}
}

For details about how to use it, you can download and view Han Shunping's video tutorial 120th session ④-verification code to prevent malicious attacks. The above code is down from the lecture notes.

Class captcha {
//
Private $ captcha_key = 'captcha _ code'; // subscript of the element in the session
Private $ width; // image width
Private $ height; // Image height

/**
* Constructor
* @ Param $ width integer width
* @ Param $ height integer height
*/
Public function _ construct (){
}

Public function generate ($ width, $ height ){
// Initialize attributes
$ This-> width = $ width;
$ This-> height = $ height;
// Create a verification code
$ Chars = array_merge (range ('A', 'z'), range ('A', 'z'), range ('1', '9 '));
$ Rand_keys = array_rand ($ chars, 4 );
Shuffle ($ rand_keys );
Foreach ($ rand_keys as $ key ){
$ Char [] = $ chars [$ key];
}

// Put it into the session
@ Session_start ();
// Connect the string and save it to the session
// Implode (). If the first parameter is not specified, it indicates a null character connection.
$ _ SESSION [$ this-> captcha_key] = implode ($ char );


// Process the image
// Step 1
$ Img = imagecreatetruecolor ($ this-> width, $ this-> height );
// Step 2
// Fill in the background
// First design the color and assign it to the image.
$ Backgroud_color = imagecolorallocate ($ img, mt_rand (180,255), mt_rand (180,255), mt_rand (180,255 ));
// Fill in the image
Imagefill ($ img, 0, 0, $ backgroud_color );


// Add some interference lines
// First assign the line segment color
For ($ I = 0; $ I <5; $ I ++ ){
$ Line_color = imagecolorallocate ($ img, mt_rand (150,200), mt_rand (150,200), mt_rand (150,200 ));
// Draw a line
Imageline ($ img, mt_rand (0, $ this-> width-1), mt_rand (0, $ this-> height-1), mt_rand (0, $ this-> width-1), mt_rand (0, $ this-> height-1), $ line_color );
}

// Add interference pixels
For ($ I = 0; I I <100; $ I ++ ){
$ Pixel_color = imagecolorallocate ($ img, mt_rand (150,200), mt_rand (150,200), mt_rand (150,200 ));
Imagesetpixel ($ img, mt_rand (0, $ this-> width-1), mt_rand (0, $ this-> height-1), $ pixel_color );
}




// Obtain the colors that can be used on resources first
$ String_color = imagecolorallocate ($ img, mt_rand (80,150), mt_rand (80,150), mt_rand (80,150 ));//
// Write the obtained string to the image
Imagestring ($ img, 5, 55, 2, $ _ SESSION [$ this-> captcha_key], $ string_color );
// Step 3
// Set the response header. the content to be output to the browser is in png format.
Header ('content-Type: image/png ');
Imagepng ($ img); // if there is no second parameter, it indicates the meaning of the output.
// Step 4
Imagedestroy ($ img );

}

/**
* Determine whether the verification code submitted by the user is correct
* @ Param $ code string data submitted by the user
* @ Return: If bool is consistent, true is returned. if not, false is returned.
*/
Public function checkCaptcha ($ code ){
Return strtoupper ($ code) = strtoupper ($ _ SESSION [$ this-> captcha_key]);
}
}

For details about how to use it, you can download and view Han Shunping's video tutorial 120th session ④-verification code to prevent malicious attacks. The above code is down from the lecture notes.

Q: What should I do if I want to generate code similar to google?