作用：
取得随机字符串
PHP获取随机数的参数：
1、(int)$length = 32 #随机字符长度
2、(int)$mode = 0 #随机字符类型，0为大小写英文和数字，1为数字，2为小写字母，3为大写字母，4为大小写字母，5为大写字母和数字，6为小写字母和数字
PHP获取随机数定义类代码
<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php </span></span></span></li>
<li><span>class getRandstrClass </span></li>
<li class="alt"><span>{ </span></li>
<li>
<span>function getCode ($</span><span class="attribute">length</span><span> = </span><span class="attribute-value">32</span><span>, $</span><span class="attribute">mode</span><span> = </span><span class="attribute-value">0</span><span>) </span>
</li>
<li class="alt"><span>{ </span></li>
<li><span>switch ($mode) { </span></li>
<li class="alt"><span>case '1': </span></li>
<li>
<span>$</span><span class="attribute">str</span><span> = </span><span class="attribute-value">'1234567890'</span><span>; </span>
</li>
<li class="alt"><span>break; </span></li>
<li><span>case '2': </span></li>
<li class="alt">
<span>$</span><span class="attribute">str</span><span> = </span><span class="attribute-value">'abcdefghijklmnopqrstuvwxyz'</span><span>; </span>
</li>
<li><span>break; </span></li>
<li class="alt"><span>case '3': </span></li>
<li>
<span>$</span><span class="attribute">str</span><span> = </span><span class="attribute-value">'ABCDEFGHIJKLMNOPQRSTUVWXYZ'</span><span>; </span>
</li>
<li class="alt"><span>break; </span></li>
<li><span>case '4': </span></li>
<li class="alt">
<span>$</span><span class="attribute">str</span><span> = </span><span class="attribute-value">'ABCDEFGHIJKLMNOPQRSTUVWXYZa<br>bcdefghijklmnopqrstuvwxyz'</span><span>;break; </span>
</li>
<li><span>case '5': </span></li>
<li class="alt">
<span>$</span><span class="attribute">str</span><span> = </span><span class="attribute-value">'ABCDEFGHIJKLMNOPQRSTUVWXY<br>Z1234567890'</span><span>; </span>
</li>
<li><span>break; </span></li>
<li class="alt"><span>case '6': </span></li>
<li>
<span>$</span><span class="attribute">str</span><span> = </span><span class="attribute-value">'abcdefghijklmnopqrstuvwxyz<br>1234567890'</span><span>; </span>
</li>
<li class="alt"><span>break; </span></li>
<li><span>default: </span></li>
<li class="alt">
<span>$</span><span class="attribute">str</span><span> = </span><span class="attribute-value">'ABCDEFGHIJKLMNOPQRSTUVWXYZa<br>bcdefghijklmnopqrstuvwxyz1234567890'</span><span>; </span>
</li>
<li><span>break; </span></li>
<li class="alt"><span>} </span></li>
<li>
<span>$</span><span class="attribute">randString</span><span> = </span><span class="attribute-value">''</span><span>; </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">len</span><span> = </span><span class="attribute-value">strlen</span><span>($str)-1; </span>
</li>
<li>
<span>for($</span><span class="attribute">i</span><span> = </span><span class="attribute-value">0</span><span>;$i </span><span class="tag"><span> $length;$i ++){ </span></span>
</li>
<li class="alt">
<span>$</span><span class="attribute">num</span><span> = </span><span class="attribute-value">mt_rand</span><span>(0, $len); </span>
</li>
<li>
<span>$randString </span><span class="attribute">.</span><span>= $str[$num]; </span>
</li>
<li class="alt"><span>} </span></li>
<li><span>return $randString ; </span></li>
<li class="alt"><span>} </span></li>
<li><span>} </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
</ol>PHP获取随机数使用说明:
1.将以上代码另存为random.php
2.在需要的页面引入random.php
<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php </span></span></span></li>
<li><span>require_once('random.php'); </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
</ol>3. 使用之前定义的类
<ol class="dp-xml"> <li class="alt"><span><span class="tag"><span> ?php </span></span></span></li> <li> <span>$</span><span class="attribute">code</span><span> = </span><span class="attribute-value">new</span><span> getRandstrClass(); </span> </li> <li class="alt"> <span>$</span><span class="attribute">length</span><span> = </span><span class="attribute-value">32</span><span>; </span> </li> <li> <span>$</span><span class="attribute">mode</span><span> = </span><span class="attribute-value">0</span><span>; </span> </li> <li class="alt"> <span>$</span><span class="attribute">str</span><span> = $code-</span><span class="tag">></span><span>getCode($length, $mode); </span> </li> <li><span>echo $str; </span></li> <li class="alt"> <span class="tag">?></span><span> </span> </li> </ol>
以上就是PHP获取随机数的全部应用方法。
