The analysis of the calculation type verification code of Thinkphp3.2

This article mainly introduces the Thinkphp3.2 practical text Verification code example, the content is very good, and now share to everyone, but also for everyone to do a reference.

Do not feel that the ordinary verification code has not been able to meet, the next introduction of how to change the current TP code to calculate the verification code:

First found: thinkphp\library\think\verify.class.php

Add the following code to it:

Public Function Entry_add ($id = ") {$this->length= ' 3 '; Picture width (px) $this->imagew | |     $this->imagew = $this->length* $this->fontsize*1.5 + $this->length* $this->fontsize/2; Picture height (px) $this->imageh | |    $this->imageh = $this->fontsize * 2.5;     Create an image $this->imagew x $this->imageh $this->_image = imagecreate ($this->imagew, $this->imageh);     Set Background imagecolorallocate ($this->_image, $this->bg[0], $this->bg[1], $this->bg[2]);    CAPTCHA font random color $this->_color = imagecolorallocate ($this->_image, Mt_rand (1,150), Mt_rand (1,150), Mt_rand (1,150)); The captcha uses a random font $ttfPath = dirname (__file__). '/verify/'. ($this->usezh? ' Zhttfs ': ' TTFs ').    '/';      if (Empty ($this->fontttf)) {$dir = Dir ($ttfPath);          $ttfs = Array ();          while (false!== ($file = $dir->read ())) {if ($file [0]! = '. ' && substr ($file,-4) = = '. Ttf ') {        $ttfs [] = $file; }} $diR->close ();    $this->fontttf = $ttfs [Array_rand ($TTFS)]; } $this->fontttf = $ttfPath.        $this->fontttf;    if ($this->useimgbg) {$this->_background ();    } if ($this->usenoise) {//Plot dot $this->_writenoise ();    } if ($this->usecurve) {//Draw interference line $this->_writecurve (); }//Draw verification Code $code = Array ();    Verification Code $symbol =array (' + ', '-'); $codeNX = 0;    The left margin of the nth character of the captcha $now _symbol= $symbol [rand (0,1)];        for ($i = 0; $i < $this->length; $i + +) {if ($i ==1) {$code [$i] = $now _symbol;        $codeNX + = Mt_rand ($this->fontsize*1.2, $this->fontsize*1.6); Imagettftext ($this->_image, $this->fontsize,0, $codeNX, $this->fontsize*1.6, $this->_color, $ttfPath. ' 2      . TTF ', $code [$i]);        } else{$code [$i] = $this->codeset[mt_rand (0, strlen ($this->codeset)-1)];        $codeNX + = Mt_rand ($this->fontsize*1.2, $this->fontsize*1.6); Imagettftext ($this->_Image, $this->fontsize, Mt_rand ( -40, Max), $codeNX, $this->fontsize*1.6, $this->_color, $this->fontttf, $      code[$i]);    }}//Save verification Code $key = $this->authcode ($this->sekey);    $str =implode (' ', $code);    Eval ("\ $re = $str;");    $code = $this->authcode ($re);    $secode = Array (); $secode [' verify_code '] = $code; Save the check code to the session $secode [' verify_time '] = now_time;                Verification code creation time session ($key. $id, $secode);    Header (' Cache-control:private, max-age=0, No-store, No-cache, Must-revalidate ');        Header (' cache-control:post-check=0, pre-check=0 ', false);    Header (' Pragma:no-cache ');    Header ("Content-type:image/png");    Output Image Imagepng ($this->_image);  Imagedestroy ($this->_image); }

Public Function Check_add ($code, $id = ') {    $key = $this->authcode ($this->sekey). $id;    The verification code cannot be empty    $secode = Session ($key);    if ($code ===false | | empty ($secode)) {      return false;    }    Whether the captcha is a numeric    if (!is_numeric ($code)) {      return false;    }    Session expires    if (now_time-$secode [' verify_time '] > $this->expire) {      session ($key, null);      return false;    }    if ($this->authcode ($code) = = $secode [' Verify_code ']) {      $this->reset && session ($key, null);      return true;    }    return false;  }

Build Method:

Public Function Verify () {    import (' ORG. Util.verify ');    $Verify = new Verify ();    $Verify->usenoise = true;    $Verify->codeset = ' 0123456789 ';    $Verify->usecurve = false;    $Verify->entry_add ();  }

Verification Method:

if (!check_verify ($verify, ' ', ' Add ')) {      $this->error (' Captcha is wrong! ');      return;    }

Public methods to invoke:

Verify the input verification code is correct, $code for the user input code string function check_verify ($code, $id = ", $type =") {  import (' ORG. Util.verify ');  $verify = new Verify ();  if ($type = ' add ') {    return $verify->check_add ($code, $id);  }  else{    return $verify->check ($code, $id);  }}

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