blocks|key|1236941|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1236942|$str+=+preg_replace_callback('/\\\\u([0-9a-fA-F]{4})/',+function+($match)+{
++++return+mb_convert_encoding(pack('H*',+$match[1]),+'UTF-8',+'UCS-2BE');
},+$str);|code-block|syntax|javascript|1236943|如果是基于UTF-16的C/C%2B%2B/Java/Json样式：|1236944|$str+=+preg_replace_callback('/\\\\u([0-9a-fA-F]{4})/',+function+($match)+{
++++return+mb_convert_encoding(pack('H*',+$match[1]),+'UTF-8',+'UTF-16BE');
},+$str);|1236945|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Try this:

<pre><code>$str = preg_replace_callback('/\\\\u([0-9a-fA-F]{4})/', function ($match) {
 return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE');
}, $str);
</code></pre>

In case it's UTF-16 based C/C++/Java/Json-style:

<pre><code>$str = preg_replace_callback('/\\\\u([0-9a-fA-F]{4})/', function ($match) {
 return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UTF-16BE');
}, $str);
</code></pre>

blocks|key|1022273|text|print_r(json_decode('{"t":"\u00ed"}'));+//+->+stdClass+Object+(+[t]+=>+í+)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1022274|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>print_r(json_decode('{"t":"\u00ed"}')); // -&gt; stdClass Object ( [t] =&gt; í )
</code></pre>

blocks|key|1022376|text|PHP+7%2B|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1022377|从PHP7开始，您可以使用Unicode+codepoint+escape+syntax来完成此操作。|offset|length|1022378|echo+"\u{00ed}";输出í。|style|CODE|1022379|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/migration70.new-features.php#migration70.new-features.unicode-codepoint-escape-syntax^0|0|D|V|0|0|0|G|I|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|6|7|W|8|@$D|X|E|Y|H|I]|$D|Z|E|10|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

<h2>PHP 7+</h2>

As of PHP 7, you can use the <a href="http://php.net/manual/en/migration70.new-features.php#migration70.new-features.unicode-codepoint-escape-syntax" rel="noreferrer">Unicode codepoint escape syntax</a> to do this.

<code>echo "\u{00ed}";</code> outputs <code>í</code>.

blocks|key|1236974|text|$str+=+'\u0063\u0061\u0074'.'\ud83d\ude38';
$str2+=+'\u0063\u0061\u0074'.'\ud83d';

//+U%2B1F638
var_dump(
++++"cat\xF0\x9F\x98\xB8"+===+escape_sequence_decode($str),
++++"cat\xEF\xBF\xBD"+===+escape_sequence_decode($str2)
);

function+escape_sequence_decode($str)+{

++++//+[U%2BD800+-+U%2BDBFF][U%2BDC00+-+U%2BDFFF]%7C[U%2B0000+-+U%2BFFFF]
++++$regex+=+'/\\\u([dD][89abAB][\da-fA-F]{2})\\\u([dD][c-fC-F][\da-fA-F]{2})
++++++++++++++%7C\\\u([\da-fA-F]{4})/sx';

++++return+preg_replace_callback($regex,+function($matches)+{

++++++++if+(isset($matches[3]))+{
++++++++++++$cp+=+hexdec($matches[3]);
++++++++}+else+{
++++++++++++$lead+=+hexdec($matches[1]);
++++++++++++$trail+=+hexdec($matches[2]);

++++++++++++//+http://unicode.org/faq/utf_bom.html#utf16-4
++++++++++++$cp+=+($lead+<<+10)+%2B+$trail+%2B+0x10000+-+(0xD800+<<+10)+-+0xDC00;
++++++++}

++++++++//+https://tools.ietf.org/html/rfc3629#section-3
++++++++//+Characters+between+U%2BD800+and+U%2BDFFF+are+not+allowed+in+UTF-8
++++++++if+($cp+>+0xD7FF+&&+0xE000+>+$cp)+{
++++++++++++$cp+=+0xFFFD;
++++++++}

++++++++//+https://github.com/php/php-src/blob/php-5.6.4/ext/standard/html.c#L471
++++++++//+php_utf32_utf8(unsigned+char+*buf,+unsigned+k)

++++++++if+($cp+<+0x80)+{
++++++++++++return+chr($cp);
++++++++}+else+if+($cp+<+0xA0)+{
++++++++++++return+chr(0xC0+%7C+$cp+>>+6).chr(0x80+%7C+$cp+&+0x3F);
++++++++}

++++++++return+html_entity_decode('&#'.$cp.';');
++++},+$str);
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1236975|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$str = '\u0063\u0061\u0074'.'\ud83d\ude38';
$str2 = '\u0063\u0061\u0074'.'\ud83d';

// U+1F638
var_dump(
 "cat\xF0\x9F\x98\xB8" === escape_sequence_decode($str),
 "cat\xEF\xBF\xBD" === escape_sequence_decode($str2)
);

function escape_sequence_decode($str) {

 // [U+D800 - U+DBFF][U+DC00 - U+DFFF]|[U+0000 - U+FFFF]
 $regex = '/\\\u([dD][89abAB][\da-fA-F]{2})\\\u([dD][c-fC-F][\da-fA-F]{2})
 |\\\u([\da-fA-F]{4})/sx';

 return preg_replace_callback($regex, function($matches) {

 if (isset($matches[3])) {
 $cp = hexdec($matches[3]);
 } else {
 $lead = hexdec($matches[1]);
 $trail = hexdec($matches[2]);

 // http://unicode.org/faq/utf_bom.html#utf16-4
 $cp = ($lead &lt;&lt; 10) + $trail + 0x10000 - (0xD800 &lt;&lt; 10) - 0xDC00;
 }

 // https://tools.ietf.org/html/rfc3629#section-3
 // Characters between U+D800 and U+DFFF are not allowed in UTF-8
 if ($cp &gt; 0xD7FF &amp;&amp; 0xE000 &gt; $cp) {
 $cp = 0xFFFD;
 }

 // https://github.com/php/php-src/blob/php-5.6.4/ext/standard/html.c#L471
 // php_utf32_utf8(unsigned char *buf, unsigned k)

 if ($cp &lt; 0x80) {
 return chr($cp);
 } else if ($cp &lt; 0xA0) {
 return chr(0xC0 | $cp &gt;&gt; 6).chr(0x80 | $cp &amp; 0x3F);
 }

 return html_entity_decode('&amp;#'.$cp.';');
 }, $str);
}
</code></pre>

blocks|key|1022297|text|还有一个解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1022298|http://www.welefen.com/php-unicode-to-utf8.html|offset|length|1022299|function+entity2utf8onechar($unicode_c){
++++$unicode_c_val+=+intval($unicode_c);
++++$f=0x80;+//+10000000
++++$str+=+"";
++++//+U-00000000+-+U-0000007F:+++0xxxxxxx
++++if($unicode_c_val+<=+0x7F){+++++++++$str+=+chr($unicode_c_val);+++++}+++++//U-00000080+-+U-000007FF:++110xxxxx+10xxxxxx
++++else+if($unicode_c_val+>=+0x80+&&+$unicode_c_val+<=+0x7FF){+++++++++$h=0xC0;+//+11000000
++++++++$c1+=+$unicode_c_val+>>+6+%7C+$h;
++++++++$c2+=+($unicode_c_val+&+0x3F)+%7C+$f;
++++++++$str+=+chr($c1).chr($c2);
++++}+else+if($unicode_c_val+>=+0x800+&&+$unicode_c_val+<=+0xFFFF){+++++++++$h=0xE0;+//+11100000
++++++++$c1+=+$unicode_c_val+>>+12+%7C+$h;
++++++++$c2+=+(($unicode_c_val+&+0xFC0)+>>+6)+%7C+$f;
++++++++$c3+=+($unicode_c_val+&+0x3F)+%7C+$f;
++++++++$str=chr($c1).chr($c2).chr($c3);
++++}
++++//U-00010000+-+U-001FFFFF:++11110xxx+10xxxxxx+10xxxxxx+10xxxxxx
++++else+if($unicode_c_val+>=+0x10000+&&+$unicode_c_val+<=+0x1FFFFF){+++++++++$h=0xF0;+//+11110000
++++++++$c1+=+$unicode_c_val+>>+18+%7C+$h;
++++++++$c2+=+(($unicode_c_val+&+0x3F000)+>>12)+%7C+$f;
++++++++$c3+=+(($unicode_c_val+&+0xFC0)+>>6)+%7C+$f;
++++++++$c4+=+($unicode_c_val+&+0x3F)+%7C+$f;
++++++++$str+=+chr($c1).chr($c2).chr($c3).chr($c4);
++++}
++++//U-00200000+-+U-03FFFFFF:++111110xx+10xxxxxx+10xxxxxx+10xxxxxx+10xxxxxx
++++else+if($unicode_c_val+>=+0x200000+&&+$unicode_c_val+<=+0x3FFFFFF){+++++++++$h=0xF8;+//+11111000
++++++++$c1+=+$unicode_c_val+>>+24+%7C+$h;
++++++++$c2+=+(($unicode_c_val+&+0xFC0000)>>18)+%7C+$f;
++++++++$c3+=+(($unicode_c_val+&+0x3F000)+>>12)+%7C+$f;
++++++++$c4+=+(($unicode_c_val+&+0xFC0)+>>6)+%7C+$f;
++++++++$c5+=+($unicode_c_val+&+0x3F)+%7C+$f;
++++++++$str+=+chr($c1).chr($c2).chr($c3).chr($c4).chr($c5);
++++}
++++//U-04000000+-+U-7FFFFFFF:++1111110x+10xxxxxx+10xxxxxx+10xxxxxx+10xxxxxx+10xxxxxx
++++else+if($unicode_c_val+>=+0x4000000+&&+$unicode_c_val+<=+0x7FFFFFFF){+++++++++$h=0xFC;+//+11111100
++++++++$c1+=+$unicode_c_val+>>+30+%7C+$h;
++++++++$c2+=+(($unicode_c_val+&+0x3F000000)>>24)+%7C+$f;
++++++++$c3+=+(($unicode_c_val+&+0xFC0000)>>18)+%7C+$f;
++++++++$c4+=+(($unicode_c_val+&+0x3F000)+>>12)+%7C+$f;
++++++++$c5+=+(($unicode_c_val+&+0xFC0)+>>6)+%7C+$f;
++++++++$c6+=+($unicode_c_val+&+0x3F)+%7C+$f;
++++++++$str+=+chr($c1).chr($c2).chr($c3).chr($c4).chr($c5).chr($c6);
++++}
++++return+$str;
}
function+entities2utf8($unicode_c){
++++$unicode_c+=+preg_replace("/\&\#([\da-f]{5})\;/es",+"entity2utf8onechar('\\1')",+$unicode_c);
++++return+$unicode_c;
}|code-block|syntax|javascript|1022300|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1B|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|H|7|W|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|C]]]]

There is also a solution: 
<a href="http://www.welefen.com/php-unicode-to-utf8.html" rel="nofollow">http://www.welefen.com/php-unicode-to-utf8.html</a>

<pre><code>function entity2utf8onechar($unicode_c){
 $unicode_c_val = intval($unicode_c);
 $f=0x80; // 10000000
 $str = "";
 // U-00000000 - U-0000007F: 0xxxxxxx
 if($unicode_c_val &lt;= 0x7F){ $str = chr($unicode_c_val); } //U-00000080 - U-000007FF: 110xxxxx 10xxxxxx
 else if($unicode_c_val &gt;= 0x80 &amp;&amp; $unicode_c_val &lt;= 0x7FF){ $h=0xC0; // 11000000
 $c1 = $unicode_c_val &gt;&gt; 6 | $h;
 $c2 = ($unicode_c_val &amp; 0x3F) | $f;
 $str = chr($c1).chr($c2);
 } else if($unicode_c_val &gt;= 0x800 &amp;&amp; $unicode_c_val &lt;= 0xFFFF){ $h=0xE0; // 11100000
 $c1 = $unicode_c_val &gt;&gt; 12 | $h;
 $c2 = (($unicode_c_val &amp; 0xFC0) &gt;&gt; 6) | $f;
 $c3 = ($unicode_c_val &amp; 0x3F) | $f;
 $str=chr($c1).chr($c2).chr($c3);
 }
 //U-00010000 - U-001FFFFF: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
 else if($unicode_c_val &gt;= 0x10000 &amp;&amp; $unicode_c_val &lt;= 0x1FFFFF){ $h=0xF0; // 11110000
 $c1 = $unicode_c_val &gt;&gt; 18 | $h;
 $c2 = (($unicode_c_val &amp; 0x3F000) &gt;&gt;12) | $f;
 $c3 = (($unicode_c_val &amp; 0xFC0) &gt;&gt;6) | $f;
 $c4 = ($unicode_c_val &amp; 0x3F) | $f;
 $str = chr($c1).chr($c2).chr($c3).chr($c4);
 }
 //U-00200000 - U-03FFFFFF: 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
 else if($unicode_c_val &gt;= 0x200000 &amp;&amp; $unicode_c_val &lt;= 0x3FFFFFF){ $h=0xF8; // 11111000
 $c1 = $unicode_c_val &gt;&gt; 24 | $h;
 $c2 = (($unicode_c_val &amp; 0xFC0000)&gt;&gt;18) | $f;
 $c3 = (($unicode_c_val &amp; 0x3F000) &gt;&gt;12) | $f;
 $c4 = (($unicode_c_val &amp; 0xFC0) &gt;&gt;6) | $f;
 $c5 = ($unicode_c_val &amp; 0x3F) | $f;
 $str = chr($c1).chr($c2).chr($c3).chr($c4).chr($c5);
 }
 //U-04000000 - U-7FFFFFFF: 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
 else if($unicode_c_val &gt;= 0x4000000 &amp;&amp; $unicode_c_val &lt;= 0x7FFFFFFF){ $h=0xFC; // 11111100
 $c1 = $unicode_c_val &gt;&gt; 30 | $h;
 $c2 = (($unicode_c_val &amp; 0x3F000000)&gt;&gt;24) | $f;
 $c3 = (($unicode_c_val &amp; 0xFC0000)&gt;&gt;18) | $f;
 $c4 = (($unicode_c_val &amp; 0x3F000) &gt;&gt;12) | $f;
 $c5 = (($unicode_c_val &amp; 0xFC0) &gt;&gt;6) | $f;
 $c6 = ($unicode_c_val &amp; 0x3F) | $f;
 $str = chr($c1).chr($c2).chr($c3).chr($c4).chr($c5).chr($c6);
 }
 return $str;
}
function entities2utf8($unicode_c){
 $unicode_c = preg_replace("/\&amp;\#([\da-f]{5})\;/es", "entity2utf8onechar('\\1')", $unicode_c);
 return $unicode_c;
}
</code></pre>

blocks|key|1237010|text|修复json值，它在u{xxx}之前添加\+to+all+%2B“”|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237011|++$item+=+preg_replace_callback('/"(.%2B?)":"(u.%2B?)",/',+function+($matches)+{
++++++++$matches[2]+=+preg_replace('/(u)/',+'\u',+$matches[2]);
++++++++++++$matches[2]+=+preg_replace('/(")/',+'&quot;',+$matches[2]);+
++++++++++++$matches[2]+=+json_decode('"'+.+$matches[2]+.+'"');+
++++++++++++return+'"'+.+$matches[1]+.+'":"'+.+$matches[2]+.+'",';
++++++++},+$item);|code-block|syntax|javascript|1237012|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

fix json values,
 it's add \ before u{xxx} to all +" "

<pre><code> $item = preg_replace_callback('/"(.+?)":"(u.+?)",/', function ($matches) {
 $matches[2] = preg_replace('/(u)/', '\u', $matches[2]);
 $matches[2] = preg_replace('/(")/', '&amp;quot;', $matches[2]); 
 $matches[2] = json_decode('"' . $matches[2] . '"'); 
 return '"' . $matches[1] . '":"' . $matches[2] . '",';
 }, $item);
</code></pre>

Is there a function in PHP that can decode Unicode escape sequences like "<code>\u00ed</code>" to "<code>í</code>" and all other similar occurrences?

I found similar question <a href="https://stackoverflow.com/questions/2045058/converting-these-types-of-unicode-to-utf8-in-php/2045105#2045105">here</a> but is doesn't seem to work.

How to decode Unicode escape sequences like "\u00ed" to proper UTF-8 encoded characters?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在PHP中有没有一个函数可以解码Unicode转义序列，比如"\u00ed“到"í”以及所有其他类似的情况？我发现了类似的问题，但似乎不起作用。

问如何将"\u00ed“这样的Unicode转义序列解码为正确的UTF-8编码字符？
EN

回答 6

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问如何将"\u00ed“这样的Unicode转义序列解码为正确的UTF-8编码字符？EN

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问如何将"\u00ed“这样的Unicode转义序列解码为正确的UTF-8编码字符？
EN