init web ems all

wxc2_omc/security/login/captcha.php

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+<?php
+/**
+ * =======================================
+ * Created by WeiBang Technology.
+ * User: Wei ZhiHua
+ * Date: 2016/10/12 0020
+ * Time: 下午 4:14
+ * Power: 实现验证码功能
+ * =======================================
+ */
+ 
+//开启session
+session_start();
+//创建一个大小为 100*30 的验证码
+$image = imagecreatetruecolor(100, 30);
+$bgcolor = imagecolorallocate($image, 255, 255, 255);
+imagefill($image, 0, 0, $bgcolor);
+ 
+$captch_code = '';
+for ($i = 0; $i < 4; $i++) {
+    $fontsize = 6;
+    $fontcolor = imagecolorallocate($image, rand(0, 120), rand(0, 120), rand(0, 120));
+    $data = 'abcdefghijkmnpqrstuvwxy3456789';
+    $fontcontent = substr($data, rand(0, strlen($data) - 1), 1);
+    $captch_code .= $fontcontent;
+    $x = ($i * 100 / 4) + rand(5, 10);
+    $y = rand(5, 10);
+    imagestring($image, $fontsize, $x, $y, $fontcontent, $fontcolor);
+}
+//就生成的验证码保存到session
+$_SESSION['authcode'] = $captch_code;
+ 
+//在图片上增加点干扰元素
+for ($i = 0; $i < 200; $i++) {
+    $pointcolor = imagecolorallocate($image, rand(50, 200), rand(50, 200), rand(50, 200));
+    imagesetpixel($image, rand(1, 99), rand(1, 29), $pointcolor);
+}
+ 
+//在图片上增加线干扰元素
+for ($i = 0; $i < 3; $i++) {
+    $linecolor = imagecolorallocate($image, rand(80, 220), rand(80, 220), rand(80, 220));
+    imageline($image, rand(1, 99), rand(1, 29), rand(1, 99), rand(1, 29), $linecolor);
+}
+//设置头
+header('content-type:image/png');
+imagepng($image);
+imagedestroy($image);
+ 
+?>