php编写生成酷炫验证码
<span style="color: #008080;"> 1</span> <span style="color: #000000;">php</span><span style="color: #008080;"> 2</span> <span style="color: #800080;">$im</span>=imagecreate(200,100<span style="color: #000000;">);//生成画布</span><span style="color: #008080;"> 3</span> imagecolorallocate(<span style="color: #800080;">$im</span>,0,0,0<span style="color: #000000;">);//背景色</span><span style="color: #008080;"> 4</span> <span style="color: #800080;">$white</span>=imagecolorallocate(<span style="color: #800080;">$im</span>,<span style="color: #008080;">rand</span>(0,255),<span style="color: #008080;">rand</span>(0,255),<span style="color: #008080;">rand</span>(0,255<span style="color: #000000;">));//生成随机颜色</span><span style="color: #008080;"> 5</span> <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=0;<span style="color: #800080;">$i</span>$i++<span style="color: #000000;">)</span><span style="color: #008080;"> 6</span> <span style="color: #000000;">{</span><span style="color: #008080;"> 7</span> imageline(<span style="color: #800080;">$im</span>,<span style="color: #008080;">rand</span>(0,200),<span style="color: #008080;">rand</span>(0,100),<span style="color: #008080;">rand</span>(0,200),<span style="color: #008080;">rand</span>(0,100),<span style="color: #800080;">$white</span><span style="color: #000000;">);//生成干扰线条元素</span><span style="color: #008080;"> 8</span> <span style="color: #000000;">}</span><span style="color: #008080;"> 9</span> <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=0;<span style="color: #800080;">$i</span>$i++<span style="color: #000000;">)</span><span style="color: #008080;">10</span> <span style="color: #000000;">{</span><span style="color: #008080;">11</span> imagesetpixel(<span style="color: #800080;">$im</span>,<span style="color: #008080;">rand</span>(0,200),<span style="color: #008080;">rand</span>(0,100),<span style="color: #800080;">$white</span><span style="color: #000000;">);//生成干扰点元素</span><span style="color: #008080;">12</span> <span style="color: #000000;">}</span><span style="color: #008080;">13</span> <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=0,<span style="color: #800080;">$str</span>='';<span style="color: #800080;">$i</span>$i++<span style="color: #000000;">)//通过循环获得四个字符</span><span style="color: #008080;">14</span> <span style="color: #000000;">{</span><span style="color: #008080;">15</span> <span style="color: #0000ff;">switch</span>(<span style="color: #008080;">rand</span>(1,3<span style="color: #000000;">))</span><span style="color: #008080;">16</span> <span style="color: #000000;"> {</span><span style="color: #008080;">17</span> <span style="color: #0000ff;">case</span>'1':<span style="color: #008080;">18</span> <span style="color: #800080;">$ch</span>=<span style="color: #008080;">rand</span>(0,9<span style="color: #000000;">);</span><span style="color: #008080;">19</span> <span style="color: #0000ff;">break</span><span style="color: #000000;">; </span><span style="color: #008080;">20</span> <span style="color: #0000ff;">case</span>'2':<span style="color: #008080;">21</span> <span style="color: #800080;">$ch</span>=<span style="color: #008080;">sprintf</span>('%c',<span style="color: #008080;">rand</span>(97,122<span style="color: #000000;">));</span><span style="color: #008080;">22</span> <span style="color: #0000ff;">break</span><span style="color: #000000;">;</span><span style="color: #008080;">23</span> <span style="color: #0000ff;">case</span>'3':<span style="color: #008080;">24</span> <span style="color: #800080;">$ch</span>=<span style="color: #008080;">sprintf</span>('%c',<span style="color: #008080;">rand</span>(65,90<span style="color: #000000;">));</span><span style="color: #008080;">25</span> <span style="color: #0000ff;">break</span><span style="color: #000000;">;</span><span style="color: #008080;">26</span> <span style="color: #000000;"> }</span><span style="color: #008080;">27</span> <span style="color: #800080;">$str</span>.=<span style="color: #800080;">$ch</span><span style="color: #000000;">;</span><span style="color: #008080;">28</span> <span style="color: #008080;">29</span> <span style="color: #000000;">}</span><span style="color: #008080;">30</span> imagettftext(<span style="color: #800080;">$im</span>,32,<span style="color: #008080;">rand</span>(0,15),55,70,<span style="color: #800080;">$white</span>,'c.ttc',<span style="color: #800080;">$str</span><span style="color: #000000;">);//在画布上输出字符串</span><span style="color: #008080;">31</span> <span style="color: #008080;">header</span>("Content-type:image/jpeg"<span style="color: #000000;">);</span><span style="color: #008080;">32</span> imagejpeg(<span style="color: #800080;">$im</span><span style="color: #000000;">);</span><span style="color: #008080;">33</span> imagedestroy(<span style="color: #800080;">$im</span><span style="color: #000000;">);</span><span style="color: #008080;">34</span> ?>
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如何解决 golang 中的 “undefined: rand.Seed” 错误？Jun 25, 2023 am 08:34 AM在使用Golang进行开发或学习过程中，我们可能会遇到undefined:rand.Seed的错误提示。这个错误通常会在需要使用随机数生成器时出现，因为在Golang中需要先设置一个随机数种子，才能使用rand包中的函数。本篇文章将介绍如何解决这种错误。1.引入math/rand包首先，我们需要在代码中引入math/rand包。在
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php rand函数生成相同随机数怎么解决Mar 23, 2023 am 09:17 AMrand()函数在每次调用时使用相同的初始种子(seeds)。预设的初始种子是从操作系统的时间获得的，但是它只有微秒级的精度。也就是说，在极短的时间内，许多rand()函数调用都将使用相同的初始种子，从而导致相同的随机数生成。那么，如何解决这个问题呢？
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php里面break的用法是什么Jan 31, 2023 pm 07:33 PM在php中，break用于跳出当前的语法结构，执行下面的语句；可以在switch、for、while和do while等语句中使用，可以终止循环体的代码并立即跳出当前的循环，执行循环之后的代码。break语句可以带一个参数n，表示跳出循环的层数，如果要跳出多重循环的话，可以用n来表示跳出的层数，如果不带参数默认是跳出本重循环。
Go语言break停止语句有什么用Jan 18, 2023 pm 03:46 PM在Go语言中，break停止语句用于循环语句中跳出循环，并开始执行循环之后的语句。break语句可以结束for、switch和select的代码块，另外break语句还可以在语句后面添加标签，表示退出某个标签对应的代码块，标签要求必须定义在对应的 for、switch和select的代码块上。
JS循环学习：跳出循环语句break和continueAug 03, 2022 pm 07:08 PM在之前的文章中，我们带大家学习了JS中的几种循环控制结构（while和do-while循环、for循环），下面聊聊跳出循环语句break和continue，希望对大家有所帮助！
Java中的break关键字的作用是什么？Apr 23, 2023 am 10:13 AM说明1、break的作用是跳出现在的循环块(for、while、dowhile)或程序块(switch)。2、循环块的作用是跳出现在循环中的循环体。程序块中的作用是中断和下一个case条件的比较。在switch语句中使用break，终止switch语句。当break用于循环时，跳出循环。在其他地方使用break是没有意义的。实例intsum=0;inti;for(i=1;i
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