<?php

$string = "hello world";

echo urlencode($string) . '<br/>'; //输出：hello+world
echo rawurldecode($string) . '<br/>';//输出：hello%20world

?>
 

<?php
for ($i = 0x20; $i < 0x7f; $i++) { 
$str .= dechex($i); 
}

$asscii = pack("H*",$str); 
echo "所有的可打印的asscii字符：（从空格到~）n". $asscii."\n"; 
echo "urlencode 的结果：\n".urlencode($asscii); 
echo "\n"; 
echo "urlencode 不做编码的字http://www.1sucai.cn/符：\n".preg_replace("/%.{2}/","",urlencode($asscii)); 
echo "\n"; 
echo "rawurlencode 的结果：\n".rawurlencode($asscii); 
echo "\n"; 
echo "rawurlencode 不做编码的字符：\n".preg_replace("/%.{2}/","",rawurlencode($asscii)); 
echo "\n";

exit;
?>

输出结果：
———————————————————————————
所有的可打印的asscii字符：（从空格到~）
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_abcdefghijklmnopqrstuvwxyz{|}~
urlencode 的结果：
+%21%22%23%24%25%26%27%28%29%2A%2B%2C-.%2F0123456789%3A%3B%3C%3D%3E%3F%40ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5C%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D%7E
urlencode 不做编码的字符：
+-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz
rawurlencode 的结果：
%20%21%22%23%24%25%26%27%28%29%2A%2B%2C-.%2F0123456789%3A%3B%3C%3D%3E%3F%40ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5C%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D%7E
rawurlencode 不做编码的字符：
-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz

>>> console.log(encodeURIComponent("统一注册1"));

%E7%BB%9F%E4%B8%80%E6%B3%A8%E5%86%8C1
>>> console.log(escape("统一注册1"));
%u7EDF%u4E00%u6CE8%u518C1

<?php
echo iconv("utf-8","gbk",urldecode("%E7%BB%9F%E4%B8%80%E6%B3%A8%E5%86%8C1")); 
echo "\n"; 
echo urldecode("%u7EDF%u4E00%u6CE8%u518C1"); 
// 使用下面的unescape可以
//echo iconv("utf-8","gbk",unescape("%u7EDF%u4E00%u6CE8%u518C1"); 
exit;
?>

输出结果：
======================================
统一注册1
%u7EDF%u4E00%u6CE8%u518C1
======================================

<?php

function unescape($str) { 
  $str = rawurldecode($str); 
  preg_match_all("/(?:%u.{4})|&#x.{4};|&#d+;|.+/U",$str,$r); 
  $ar = $r[0]; 
  foreach($ar as $k=>$v) { 
    if(substr($v,0,2) == "%u") 
      $ar[$k] = iconv("UCS-2","UTF-8",pack("H4",substr($v,-4))); 
    elseif(substr($v,0,3) == "&#x") 
      $ar[$k] = iconv("UCS-2","UTF-8",pack("H4",substr($v,3,-1))); 
    elseif(substr($v,0,2) == "&#") { 
      $ar[$k] = iconv("UCS-2","UTF-8",pack("n",substr($v,2,-1))); 
    } 
  } 
  return join("",$ar); 
}

?>

 

>>> console.log(escape(" !\"#$%&'()*+,-./0123456789:;=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_abcdefghijklmnopqrstuvwxyz{|}~"));
%20%21%22%23%24%25%26%27%28%29*+%2C-./0123456789%3A%3B%3C%3D%3E%3F@ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D%7E
>>> console.log(encodeURIComponent("!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_abcdefghijklmnopqrstuvwxyz{|}~"));
%20!%22%23%24%25%26'()*%2B%2C-.%2F0123456789%3A%3B%3C%3D%3E%3F%40ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D~
>>> console.log(escape("!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_abcdefghijklmnopqrstuvwxyz{|}~").replace(/%.{2}/g,""));

*+-./0123456789@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz
>>> console.log(encodeURIComponent("!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~").replace(/%.{2}/g,""));
!'()*-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~