创建一个Json文件
$json = array(
"Add"=>array(
"context" => "$context",
"date"=> "$date"
),
"Version"=>array(
"version"=>$version
)
);
和$context是波斯语文本(所以我需要一个UTF-8格式为我的Json)。现在我用这个
echo json_encode($json,JSON_UNESCAPED_UNICODE);
查看我的json文件，但是Codeigniter给出了这2个错误
A PHP Error was encountered
Severity: Notice
Message: Use of undefined constant JSON_UNESCAPED_UNICODE - assumed 'JSON_UNESCAPED_UNICODE'
和
A PHP Error was encountered
Severity: Warning
Message: json_encode() expects parameter 2 to be long, string given
来自文档:
JSON_UNESCAPED_UNICODE(整数)
[…PHP 5.4.0以后可用。
你的PHP版本没有定义这个常量(定义它是没有用的)。
也许这对你有帮助:
function json_cb(&$item, $key) {
if (is_string($item)) $item = mb_encode_numericentity($item, array (0x80, 0xffff, 0, 0xffff), 'UTF-8');
}
function my_json_encode($arr){
//convmap since 0x80 char codes so it takes all multibyte codes (above ASCII 127). So such characters are being "hidden" from normal json_encoding
array_walk_recursive($arr, 'json_cb');
return mb_decode_numericentity(json_encode($arr), array (0x80, 0xffff, 0, 0xffff), 'UTF-8');
}
尝试my_json_encode代替json_encode.
在较新的PHP版本中，此错误是由缺少PHP -json模块引起的。只要安装它，你就可以使用了。例如CentOS: sudo dnf install php-json
function json_encode_unicode($data) {
if (defined('JSON_UNESCAPED_UNICODE')) {
return json_encode($data, JSON_UNESCAPED_UNICODE);
}
return preg_replace_callback('/(?<!'''')''''u([0-9a-f]{4})/i',
function ($m) {
$d = pack("H*", $m[1]);
$r = mb_convert_encoding($d, "UTF8", "UTF-16BE");
return $r!=="?" && $r!=="" ? $r : $m[0];
}, json_encode($data)
);
}
// some benchmarking...
print "'n'n".title("Benchmarks")."'n";
gauge("json_encode", 1000, function() use ($data) {
json_encode($data);
});
gauge("json_encode_unicode", 1000, function() use ($data) {
json_encode_unicode($data);
});
// Utils...
function gauge($label, $times, $callback) {
$tstart = microtime(true);
for ($i=0; $i<$times; $i++) {
$callback();
}
$tend = microtime(true);
$took = ($tend-$tstart);
print (ceil($took*1000)/1000)." to run $label run $times times'n";
}
function title($str) {
return $str."'n".str_repeat("-",strlen($str));
}
?>
result
php: print_r(data)
------------------
stdClass Object
(
[html] => <foo bar="baz"/> &
[arabic] => العربية al-ʿarabiyyah, IPA: [æl ʕɑrɑˈbijjɐ], or عربي ʿarabī
[hebrew] => עִבְרִית, Ivrit
[chinese] => 汉语/漢語 Hanyu; 华语/華語 Huáyǔ; 中文 Zhōngwén
[korean] => 한국어/조선말
[japanese] => 日本語 Nihongo
[umlauts] => äüöãáàß
[escaped] => 'u65e5'u672c'u8a9e
[emoji] => ☺ <img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f604.png' class='emoji' title='SMILING FACE WITH OPEN MOUTH AND SMILING EYES' alt='SMILING FACE WITH OPEN MOUTH AND SMILING EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f60a.png' class='emoji' title='SMILING FACE WITH SMILING EYES' alt='SMILING FACE WITH SMILING EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f603.png' class='emoji' title='SMILING FACE WITH OPEN MOUTH' alt='SMILING FACE WITH OPEN MOUTH' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/263a.png' class='emoji' title='WHITE SMILING FACE' alt='WHITE SMILING FACE' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f609.png' class='emoji' title='WINKING FACE' alt='WINKING FACE' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f60d.png' class='emoji' title='SMILING FACE WITH HEART-SHAPED EYES' alt='SMILING FACE WITH HEART-SHAPED EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f618.png' class='emoji' title='FACE THROWING A KISS' alt='FACE THROWING A KISS' style='height:1em !important; width:1em !important; float:none !important' > <img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f604.png' class='emoji' title='SMILING FACE WITH OPEN MOUTH AND SMILING EYES' alt='SMILING FACE WITH OPEN MOUTH AND SMILING EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f60a.png' class='emoji' title='SMILING FACE WITH SMILING EYES' alt='SMILING FACE WITH SMILING EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f603.png' class='emoji' title='SMILING FACE WITH OPEN MOUTH' alt='SMILING FACE WITH OPEN MOUTH' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f609.png' class='emoji' title='WINKING FACE' alt='WINKING FACE' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f60d.png' class='emoji' title='SMILING FACE WITH HEART-SHAPED EYES' alt='SMILING FACE WITH HEART-SHAPED EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f618.png' class='emoji' title='FACE THROWING A KISS' alt='FACE THROWING A KISS' style='height:1em !important; width:1em !important; float:none !important' >
)
php: json_encode(data)
----------------------
{"html":"<foo bar='"baz'"'/> &","arabic":"'u0627'u0644'u0639'u0631'u0628'u064a'u0629 al-'u02bfarabiyyah, IPA: ['u00e6l 'u0295'u0251r'u0251'u02c8bijj'u0250], or 'u0639'u0631'u0628'u064a 'u02bfarab'u012b","hebrew":"'u05e2'u05b4'u05d1'u05b0'u05e8'u05b4'u05d9'u05ea, Ivrit","chinese":"'u6c49'u8bed'/'u6f22'u8a9e Hanyu; 'u534e'u8bed'/'u83ef'u8a9e Hu'u00e1y'u01d4; 'u4e2d'u6587 Zh'u014dngw'u00e9n","korean":"'ud55c'uad6d'uc5b4'/'uc870'uc120'ub9d0","japanese":"'u65e5'u672c'u8a9e Nihongo","umlauts":"'u00e4'u00fc'u00f6'u00e3'u00e1'u00e0'u00df","escaped":"''u65e5''u672c''u8a9e","emoji":"'u263a 'ue415'ue056'ue057'ue414'ue405'ue106'ue418 'ud83d'ude04'ud83d'ude0a'ud83d'ude03'ud83d'ude09'ud83d'ude0d'ud83d'ude18"}
strlen: 708
php: json_encode_unicode(data)
------------------------------
{"html":"<foo bar='"baz'"'/> &","arabic":"العربية al-ʿarabiyyah, IPA: [æl ʕɑrɑˈbijjɐ], or عربي ʿarabī","hebrew":"עִבְרִית, Ivrit","chinese":"汉语'/漢語 Hanyu; 华语'/華語 Huáyǔ; 中文 Zhōngwén","korean":"한국어'/조선말","japanese":"日本語 Nihongo","umlauts":"äüöãáàß","escaped":"''u65e5''u672c''u8a9e","emoji":"☺ <img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f604.png' class='emoji' title='SMILING FACE WITH OPEN MOUTH AND SMILING EYES' alt='SMILING FACE WITH OPEN MOUTH AND SMILING EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f60a.png' class='emoji' title='SMILING FACE WITH SMILING EYES' alt='SMILING FACE WITH SMILING EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f603.png' class='emoji' title='SMILING FACE WITH OPEN MOUTH' alt='SMILING FACE WITH OPEN MOUTH' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/263a.png' class='emoji' title='WHITE SMILING FACE' alt='WHITE SMILING FACE' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f609.png' class='emoji' title='WINKING FACE' alt='WINKING FACE' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f60d.png' class='emoji' title='SMILING FACE WITH HEART-SHAPED EYES' alt='SMILING FACE WITH HEART-SHAPED EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f618.png' class='emoji' title='FACE THROWING A KISS' alt='FACE THROWING A KISS' style='height:1em !important; width:1em !important; float:none !important' > 'ud83d'ude04'ud83d'ude0a'ud83d'ude03'ud83d'ude09'ud83d'ude0d'ud83d'ude18"}
strlen: 471
php: print_r(json_decode(json_encode_unicode(data)))
----------------------------------------------------
stdClass Object
(
[html] => <foo bar="baz"/> &
[arabic] => العربية al-ʿarabiyyah, IPA: [æl ʕɑrɑˈbijjɐ], or عربي ʿarabī
[hebrew] => עִבְרִית, Ivrit
[chinese] => 汉语/漢語 Hanyu; 华语/華語 Huáyǔ; 中文 Zhōngwén
[korean] => 한국어/조선말
[japanese] => 日本語 Nihongo
[umlauts] => äüöãáàß
[escaped] => 'u65e5'u672c'u8a9e
[emoji] => ☺ <img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f604.png' class='emoji' title='SMILING FACE WITH OPEN MOUTH AND SMILING EYES' alt='SMILING FACE WITH OPEN MOUTH AND SMILING EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f60a.png' class='emoji' title='SMILING FACE WITH SMILING EYES' alt='SMILING FACE WITH SMILING EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f603.png' class='emoji' title='SMILING FACE WITH OPEN MOUTH' alt='SMILING FACE WITH OPEN MOUTH' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/263a.png' class='emoji' title='WHITE SMILING FACE' alt='WHITE SMILING FACE' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f609.png' class='emoji' title='WINKING FACE' alt='WINKING FACE' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f60d.png' class='emoji' title='SMILING FACE WITH HEART-SHAPED EYES' alt='SMILING FACE WITH HEART-SHAPED EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f618.png' class='emoji' title='FACE THROWING A KISS' alt='FACE THROWING A KISS' style='height:1em !important; width:1em !important; float:none !important' > <img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f604.png' class='emoji' title='SMILING FACE WITH OPEN MOUTH AND SMILING EYES' alt='SMILING FACE WITH OPEN MOUTH AND SMILING EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f60a.png' class='emoji' title='SMILING FACE WITH SMILING EYES' alt='SMILING FACE WITH SMILING EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f603.png' class='emoji' title='SMILING FACE WITH OPEN MOUTH' alt='SMILING FACE WITH OPEN MOUTH' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f609.png' class='emoji' title='WINKING FACE' alt='WINKING FACE' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f60d.png' class='emoji' title='SMILING FACE WITH HEART-SHAPED EYES' alt='SMILING FACE WITH HEART-SHAPED EYES' style='height:1em !important; width:1em !important; float:none !important' ><img src='chrome-extension://cahedbegdkagmcjfolhdlechbkeaieki/images/1f618.png' class='emoji' title='FACE THROWING A KISS' alt='FACE THROWING A KISS' style='height:1em !important; width:1em !important; float:none !important' >
)
php: data == json_decode(json_encode_unicode(data))
---------------------------------------------------
1
Benchmarks
----------
0.01 to run json_encode run 1000 times
0.658 to run json_encode_unicode run 1000 times