验证码类，php验证码类_PHP教程

<span><br /> 1</span>     <span>//</span><span>code class</span>
<span> 2</span>     <span>class</span><span> ValidateCode {
</span><span> 3</span>         <span>private</span> <span>$charset</span> = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';    <span>//</span><span>random effects</span>
<span> 4</span>         <span>private</span> <span>$code</span>;              <span>//</span><span>code  </span>
<span> 5</span>         <span>private</span> <span>$codelen</span> = 4 ;      <span>//</span><span>code length</span>
<span> 6</span>         <span>private</span> <span>$width</span> = 130;       <span>//</span><span>width</span>
<span> 7</span>         <span>private</span> <span>$heigth</span> = 50;       <span>//</span><span>height</span>
<span> 8</span>         <span>private</span> <span>$img</span>;               <span>//</span><span>image handle</span>
<span> 9</span>         <span>private</span> <span>$font</span>;              <span>//</span><span>font file</span>
<span>10</span>         <span>private</span> <span>$fontsize</span> = 20;          <span>//</span><span>font size</span>
<span>11</span>         <span>private</span> <span>$fontcolor</span>;         <span>//</span><span>font color
</span><span>12</span>         
<span>13</span> <span>        //the construct initialization</span>
<span>14</span>         <span>public</span> <span>function</span><span> __construct(){
</span><span>15</span>             <span>$this</span>->font = ROOT_PATH.'/font/elephant.ttf'<span>;
</span><span>16</span> <span>        }
</span><span>17</span>                 
<span>18</span>         <span>//</span><span>create random code from $charset</span>
<span>19</span>         <span>private</span> <span>function</span><span> createCode(){
</span><span>20</span>             <span>$_len</span> = <span>strlen</span>(<span>$this</span>-><span>charset);
</span><span>21</span>             <span>for</span>(<span>$i</span>=1;<span>$i</span><=<span>$this</span>->codelen;<span>$i</span>++<span>){
</span><span>22</span>                 <span>$this</span>->code .= <span>$this</span>->charset[<span>mt_rand</span>(0,<span>$_len</span><span>)];
</span><span>23</span> <span>            }
</span><span>24</span> <span>        }
</span><span>25</span>         
<span>26</span>         <span>//</span><span>create background</span>
<span>27</span>         <span>private</span> <span>function</span><span> createBg(){
</span><span>28</span>             <span>$this</span>->img = imagecreatetruecolor(<span>$this</span>->width, <span>$this</span>-><span>heigth);
</span><span>29</span>             <span>$_color</span> = imagecolorallocate(<span>$this</span>->img, <span>mt_rand</span>(157,255), <span>mt_rand</span>(157,255), <span>mt_rand</span>(157,255<span>));
</span><span>30</span>             imagefilledrectangle(<span>$this</span>->img,0,0,<span>$this</span>->width,<span>$this</span>->heigth,<span>$_color</span><span>);
</span><span>31</span> <span>        }
</span><span>32</span>         
<span>33</span>         <span>//</span><span>create font</span>
<span>34</span>         <span>private</span> <span>function</span><span> createFont(){
</span><span>35</span>             <span>$_x</span> = <span>$this</span>->width / <span>$this</span>-><span>codelen;
</span><span>36</span>             <span>for</span>(<span>$i</span>=0;<span>$i</span><<span>$this</span>->codelen;<span>$i</span>++<span>){
</span><span>37</span>                 <span>$this</span>->fontcolor = imagecolorallocate(<span>$this</span>->img, <span>mt_rand</span>(0,156),  <span>mt_rand</span>(0,156),  <span>mt_rand</span>(0,156<span>));
</span><span>38</span>                 imagettftext(<span>$this</span>->img, <span>$this</span>->fontsize, <span>mt_rand</span>(-30,30), <span>$_x</span>*<span>$i</span>+<span>mt_rand</span>(1,5), <span>$this</span>->heigth/1.4, <span>$this</span>->fontcolor, <span>$this</span>->font, <span>$this</span>->code[<span>$i</span><span>]);
</span><span>39</span> <span>            }
</span><span>40</span> <span>        }
</span><span>41</span>         
<span>42</span>         <span>//</span><span>create line,snowflake</span>
<span>43</span>         <span>private</span> <span>function</span><span> createLine(){
</span><span>44</span>             <span>for</span>(<span>$i</span>=0;<span>$i</span><6;<span>$i</span>++<span>){
</span><span>45</span>                 <span>$_color</span> = imagecolorallocate(<span>$this</span>->img, <span>mt_rand</span>(0,156),  <span>mt_rand</span>(0,156),  <span>mt_rand</span>(0,156<span>));
</span><span>46</span>                 imageline(<span>$this</span>->img, <span>mt_rand</span>(0,<span>$this</span>->width), <span>mt_rand</span>(0, <span>$this</span>->heigth),<span>mt_rand</span>(0,<span>$this</span>->width), <span>mt_rand</span>(0, <span>$this</span>->heigth), <span>$_color</span><span>);
</span><span>47</span> <span>            }
</span><span>48</span>             <span>for</span>(<span>$i</span>=0;<span>$i</span><100;<span>$i</span>++<span>){
</span><span>49</span>                 <span>$_color</span> = imagecolorallocate(<span>$this</span>->img, <span>mt_rand</span>(157,255), <span>mt_rand</span>(157,255), <span>mt_rand</span>(157,255<span>));
</span><span>50</span>                 imagestring(<span>$this</span>->img, <span>mt_rand</span>(1, 5), <span>mt_rand</span>(0,<span>$this</span>->width), <span>mt_rand</span>(0,<span>$this</span>->heigth), '*', <span>$_color</span><span>);
</span><span>51</span> <span>            }
</span><span>52</span> <span>        }
</span><span>53</span>         
<span>54</span>         <span>//</span><span>export image</span>
<span>55</span>         <span>private</span> <span>function</span><span> outPut(){
</span><span>56</span>             <span>header</span>('Content-type:image/png'<span>);
</span><span>57</span>             imagepng(<span>$this</span>-><span>img);
</span><span>58</span>             imagedestroy(<span>$this</span>-><span>img);
</span><span>59</span> <span>        }
</span><span>60</span>         
<span>61</span>         <span>//</span><span>display</span>
<span>62</span>         <span>public</span> <span>function</span><span> doimg(){
</span><span>63</span>             <span>$this</span>-><span>createBg();
</span><span>64</span>             <span>$this</span>-><span>createCode();
</span><span>65</span>             <span>$this</span>-><span>createLine();
</span><span>66</span>             <span>$this</span>-><span>createFont();
</span><span>67</span>             <span>$this</span>-><span>outPut();
</span><span>68</span> <span>        }
</span><span>69</span>         
<span>70</span>         <span>//</span><span>get code</span>
<span>71</span>         <span>public</span> <span>function</span><span> getCode(){
</span><span>72</span>             <span>return</span> <span>strtolower</span>(<span>$this</span>-><span>code);
</span><span>73</span> <span>        }
</span><span>74</span>         
<span>75</span> <span>    }
</span><span>76</span>