PHP login verification code function attached call method, php verification code _ PHP Tutorial

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PHP login verification code function with call method, php verification code. The PHP login verification code function is provided with a call method. The php verification code example in this article shares a PHP login verification code function for your reference. The details are as follows: ShowKey. php PHP login verification code function attached call method, php verification code

This article provides an example of a PHP login verification code function for your reference. The details are as follows:

ShowKey. php

<? Phpsession_start (); // Set COOKIE or Sessionfunction esetcookie ($ name, $ str, $ life = 0) {// This function reduces all str strings and writes the string so that the verification code input is case-insensitive-the same function conversion is required for session comparison in the submission form $ _ SESSION [$ name] = strtolower ($ str );} // obtain random characters. This function is case sensitive. if it is case insensitive, add the strtolowerfunction domake_password ($ len) {$ chars = array (/* "a", "B ", "c", "d", "e", "f", "g", "h", "I", "j", "k", "l ", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v ", "w", "x", "y", "z "," A "," B "," C "," D "," E "," F "," G "," H "," I "," J ", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T ", "U", "V", "W", "X", "Y", "Z", */"0", "1", "2 ", "3", "4", "5", "6", "7", "8", "9"); $ charsLen = count ($ chars)-1; shuffle ($ chars); // disrupt the array $ output = ""; for ($ I = 0; $ I <$ len; $ I ++) {$ output. = $ chars [mt_rand (0, $ charsLen)]; // Get an array element} return $ output;} // display the verification code function ShowKey () {$ key = domake_password (4); // Get the random value $ set = esetcookie ("checkkey", $ key ); // write random values into cookies or sessions // whether the gd library if (function_exists ("imagejpeg") {header ("Content-type: image/jpeg") is supported "); $ img = imagecreate (102,102,102); $ blue = imagecolorallocate ($ img, 255,255,255); $ white = ImageColorAllocate ($ img,); $ black = ImageColorAllocate ($ img, 71); imagefill ($ img, 0, 0, $ blue); imagestring ($ img, 5, 6, 3, $ key, $ white); for ($ I = 0; $ I <90; $ I ++) // add interference pixels {Imagesetpixel ($ img, rand () % 70, rand () % 30, $ black);} imagejpeg ($ img); imagedestroy ($ img );} elseif (function_exists ("imagepng") {header ("Content-type: image/png"); $ img = imagecreate (47,20); $ blue = imagecolorallocate ($ img, 102,102,102); $ white = ImageColorAllocate ($ img, 255,255,255); $ black = ImageColorAllocate ($ img, 71); imagefill ($ img, $ blue ); imagestring ($ img, 5, 6, 3, $ key, $ white); for ($ I = 0; $ I <90; $ I ++) // add interference pixels {imagesetpixel ($ img, rand () % 70, rand () % 30, $ black);} imagepng ($ img ); imagedestroy ($ img);} elseif (function_exists ("imagegif") {header ("Content-type: image/gif"); $ img = imagecreate (47,20 ); $ blue = imagecolorallocate ($ img, 102,102,102); $ white = ImageColorAllocate ($ img, 255,255,255); $ black = ImageColorAllocate ($ img, 71,71, 71); imagefill ($ img, 0, 0, $ blue); imagestring ($ img, 5, 6, 3, $ key, $ white ); For ($ I = 0; $ I <90; $ I ++) // add interference pixels {imagesetpixel ($ img, rand () % 70, rand () % 30, $ black);} imagegif ($ img); imagedestroy ($ img);} elseif (function_exists ("imagewbmp") {header ("Content-type: image/vnd. wap. wbmp "); $ img = imagecreate (102,102,102); $ blue = imagecolorallocate ($ img, 255,255,255); $ white = ImageColorAllocate ($ img ); $ black = ImageColorAllocate ($ img, 71); imagefill ($ img, $ blue); imagestring ($ Img, 5, 6, 3, $ key, $ white); for ($ I = 0; $ I <90; $ I ++) // add interference pixels {imagesetpixel ($ img, rand () % 70, rand () % 30, $ black);} imagewbmp ($ img ); imagedestroy ($ img);} else {// verification code header ("content-type: image/jpeg \ r \ n"); header ("Pragma: no-cache \ r \ n "); header (" Cache-Control: no-cache \ r \ n "); header (" Expires: 0 \ r \ n "); $ fp = fopen ("data/vdcode.jpg", "r") ;}} ShowKey () ;?>

Call method:

The code is as follows:

The above is all the content of this article. I hope it will help you learn php programming.

Refer to the attached call method. The php verification code example in this article shares a login verification code function written in PHP for your reference. The details are as follows: ShowKey. php...

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