2024-10-10

web/include/base64.php

@@ -0,0 +1,39 @@
+<?php
+/**
+* base64编码
+* @author :xia0ji233 
+*/
+function decode64($input) {
+    $keyStr = "3WiPZ+xr/yKf5OdQ6UATHYItebL8B0njk192cJRNagGm7hoECvFVpqw4DsMlzuXS=";//换表
+    $output = "";
+    $chr1="";
+    $chr2="";
+    $chr3="";
+    $enc1=$enc2=$enc3=$enc4="";
+    $i = 0;
+    if (strlen($input) % 4 != 0) {
+        return "";
+    }
+    $len=strlen($input);
+    do {
+        $enc1 = strpos($keyStr,$input[$i++]);
+        $enc2 = strpos($keyStr,$input[$i++]);
+        $enc3 = strpos($keyStr,$input[$i++]);
+        $enc4 = strpos($keyStr,$input[$i++]);
+        $chr1 = ($enc1 << 2) | ($enc2 >> 4);
+        $chr2 = (($enc2 & 15) << 4) | ($enc3 >> 2);
+        $chr3 = (($enc3 & 3) << 6) | $enc4;
+        $output = $output.chr($chr1);
+
+        if ($enc3 != 64) {
+            $output .= chr($chr2);
+        }
+        if ($enc4 != 64) {
+            $output .= chr($chr3);
+        }
+        $chr1 = $chr2 = $chr3 = "";
+        $enc1 = $enc2 = $enc3 = $enc4 = "";
+    } while ($i < $len);
+    return $output;
+}
+?>