Specific implementation method of PHP graphic verification code

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Specific implementation method of PHP graphic verification code_PHP tutorial

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Jul 15, 2016 pm 01:28 PM

php specific graphics place accomplish us method register now of code website enter need verify

We now often see requests for payment that require you to enter a verification code in website registration and other places. It displays random numbers or symbols in the form of pictures in front of users, and provides verification before they can use related functions. Today we will introduce the specific implementation code of as follows:

<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span></span></li>
<li class=""><span> </span></li>
<li class="alt"><span>class rndnum{  </span></li>
<li class=""><span> </span></li>
<li class="alt"><span>function rnd(){  </span></li>
<li class=""><span>srand((double)microtime()*1000000);  </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">rnd_number</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">array</font></span><span>(  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">1</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'1',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">2</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'2',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">3</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'3',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">4</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'4',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">5</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'5',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">6</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'6',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">7</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'7',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">8</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'8',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">9</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'9',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">10</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'a',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">11</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'b',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">12</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'c',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">13</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'d',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">14</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'e',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">15</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'f',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">16</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'g',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">17</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'h',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">18</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'i',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">19</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'j',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">20</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'k',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">21</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'l',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">22</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'m',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">23</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'n',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">24</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'o',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">25</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'p',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">26</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'q',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">27</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'r',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">28</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'s',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">29</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'t',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">30</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'u',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">31</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'v',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">32</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'w',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">33</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'x',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">34</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'y',  </span>
</li>
<li class="">
<span></span><span class="attribute"><font color="#ff0000">35</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'z',  </span>
</li>
<li class="alt">
<span></span><span class="attribute"><font color="#ff0000">36</font></span><span>=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'0'  </span>
</li>
<li class=""><span>);  </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">result</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">array_rand</font></span><span>($rnd_number,6);  </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">j</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">count</font></span><span>($result);  </span>
</li>
<li class="alt">
<span>for ($</span><span class="attribute"><font color="#ff0000">i</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">0</font></span><span>;$i</span><span class="tag"><strong><font color="#006699"><</FONT></STRONG></SPAN><SPAN>$j;$i++) {  </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>re.</FONT></SPAN><SPAN>=$rnd_number[$result[$i]];  </SPAN></SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>//$</SPAN><SPAN class=attribute><FONT color=#ff0000>re</FONT></SPAN><SPAN>=$rnd_number[$result[1]].$rnd_number[$result[2]].$rnd_number[$result[3]].$rnd_number[$result[4]].$rnd_number[$result[5]].$rnd_number[$result[6]].$rnd_number[$result[7]];  </SPAN></SPAN><LI class=alt><SPAN>//return array_keys($result);  </SPAN><LI class=""><SPAN>return $re;  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN>/*用法  </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>rndnum</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>new</FONT></SPAN><SPAN> rndnum();  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>num</FONT></SPAN><SPAN>=$rndnum-</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></font></strong></span><span>rnd();  </span>
</li>
<li class=""><span>echo $num;  </span></li>
<li class="alt"><span>*/  </span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
</ol>

Copy after login

Generate a picture of the PHP graphic verification code and fill it with random numbers:

<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span></span></li>
<li class=""><span> </span></li>
<li class="alt"><span>Header("Content-type: image/PNG");   </span></li>
<li class=""><span>require_once("rndnum.php");  </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">rndnum</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">new</font></span><span> rndnum();  </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">authnum</font></span><span>=$rndnum-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>rnd();  </span>
</li>
<li class="alt"><span>session_start();  </span></li>
<li class=""><span>$_SESSION["extrra_code"]=$authnum;  </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">im</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">imagecreate</font></span><span>(72,20);   </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">black</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">ImageColorAllocate</font></span><span>($im, 0,0,0);   </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">white</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">ImageColorAllocate</font></span><span>($im, 255,255,255);   </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">gray</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">ImageColorAllocate</font></span><span>($im, 200,200,200);   </span>
</li>
<li class="alt"><span>imagefill($im,0,0,$gray);    </span></li>
<li class=""><span>imagestring($im,5,10,3,$authnum,$black);   </span></li>
<li class="alt">
<span>for($</span><span class="attribute"><font color="#ff0000">i</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">0</font></span><span>;$i</span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>200</SPAN></FONT></STRONG><SPAN>;$i++)   //加入干扰象素   </SPAN></SPAN><LI class=""><SPAN>{   </SPAN><LI class=alt><SPAN>    $</SPAN><SPAN class=attribute><FONT color=#ff0000>randcolor</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>ImageColorallocate</FONT></SPAN><SPAN>($im,rand(0,255),rand(0,255),rand(0,255));  </SPAN></SPAN><LI class=""><SPAN>    imagesetpixel($im, rand()%70 , rand()%30 , $randcolor);   </SPAN><LI class=alt><SPAN>}   </SPAN><LI class=""><SPAN>ImagePNG($im);   </SPAN><LI class=alt><SPAN>ImageDestroy($im);   </SPAN><LI class=""><SPAN></SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></span></font></strong><span> </span>
</li>
</ol>

Copy after login

The above is the implementation code of all PHP graphic verification codes. I hope it will be helpful to everyone.

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