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HomeBackend DevelopmentPHP Tutorial !关于php urlencode 里的 "+" 号

求助!关于php urlencode 里的 "+" 号
php 里的 "+" 号 被urlencode 编码后,


再用 urldecode 解码,变成了 ' ' ,即空的,也不知道是空格还是空,我看起来像是空格,

总之就不是原来的 '+' 号了,我应该怎么解决才能得到原来的 + 号?

------解决方案--------------------

探讨

我测试也出现这种情况:
PHP code

#发送页面
$param = "1+1";
echo urlencode($param)."
";
#1%2B1
header("Location:./test17.php/?can=".urlencode($param));
#http://path/test/test_csdn/test17.php/?can=1%2B1

#接收页面
i……

------解决方案--------------------
探讨

那这个urldecode 函数有啥用?
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