Rumah > Artikel > pembangunan bahagian belakang > php编写生成酷炫验证码 yii2 验证码 验证码 php 图片 php验证码不显
<span> 1</span> <span>php </span><span> 2</span><span>$im</span>=imagecreate(200,100<span>);//生成画布 </span><span> 3</span> imagecolorallocate(<span>$im</span>,0,0,0<span>);//背景色 </span><span> 4</span><span>$white</span>=imagecolorallocate(<span>$im</span>,<span>rand</span>(0,255),<span>rand</span>(0,255),<span>rand</span>(0,255<span>));//生成随机颜色 </span><span> 5</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$i++<span>) </span><span> 6</span><span>{ </span><span> 7</span> imageline(<span>$im</span>,<span>rand</span>(0,200),<span>rand</span>(0,100),<span>rand</span>(0,200),<span>rand</span>(0,100),<span>$white</span><span>);//生成干扰线条元素 </span><span> 8</span><span>} </span><span> 9</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$i++<span>) </span><span>10</span><span>{ </span><span>11</span> imagesetpixel(<span>$im</span>,<span>rand</span>(0,200),<span>rand</span>(0,100),<span>$white</span><span>);//生成干扰点元素 </span><span>12</span><span>} </span><span>13</span><span>for</span>(<span>$i</span>=0,<span>$str</span>='';<span>$i</span>$i++<span>)//通过循环获得四个字符 </span><span>14</span><span>{ </span><span>15</span><span>switch</span>(<span>rand</span>(1,3<span>)) </span><span>16</span><span> { </span><span>17</span><span>case</span>'1': <span>18</span><span>$ch</span>=<span>rand</span>(0,9<span>); </span><span>19</span><span>break</span><span>; </span><span>20</span><span>case</span>'2': <span>21</span><span>$ch</span>=<span>sprintf</span>('%c',<span>rand</span>(97,122<span>)); </span><span>22</span><span>break</span><span>; </span><span>23</span><span>case</span>'3': <span>24</span><span>$ch</span>=<span>sprintf</span>('%c',<span>rand</span>(65,90<span>)); </span><span>25</span><span>break</span><span>; </span><span>26</span><span> } </span><span>27</span><span>$str</span>.=<span>$ch</span><span>; </span><span>28</span><span>29</span><span>} </span><span>30</span> imagettftext(<span>$im</span>,32,<span>rand</span>(0,15),55,70,<span>$white</span>,'c.ttc',<span>$str</span><span>);//在画布上输出字符串 </span><span>31</span><span>header</span>("Content-type:image/jpeg"<span>); </span><span>32</span> imagejpeg(<span>$im</span><span>); </span><span>33</span> imagedestroy(<span>$im</span><span>); </span><span>34</span> ?>
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