How to solve php encoding conversion garbled characters

This article mainly shares with you how to solve php encoding conversion garbled code, combining text and code, I hope it can help everyone.

iconv Detailed explanation:
iconv - String is converted according to the required character encoding
iconv has a bug, and it will not be able to convert some rare characters. Of course, when configuring the second parameter, you can make up for the default defects a little, so that it will not be unable to convert or truncate. The usage is as follows
iconv("UTF-8″, "GB2312//IGNORE",$data);
When encountering a rare word conversion failure, it will ignore the failure and continue to convert the following content.

iconvstring iconv ( string $in_charset , string $out_charset , string $str )

第一个参数：内容原的编码

第二个参数：目标编码

第三个参数：要转的字符串

函数返回字符串<?php$instr = ‘测试’;// GBK转UTF-8$outstr = iconv(‘GBK’,&#39;UTF-8′,$instr);

?>

Return value
Returns the converted string, or returns FALSE on failure.

mb_convert_encoding detailed explanation:
In order to ensure the success rate of conversion, we can use another conversion function
mb_convert_encoding, this The efficiency of the function is not very high. In addition, this function can also omit the third parameter and automatically identify the content encoding. However, it is best not to use it, which will affect the efficiency. You also need to pay attention to the fact that the order of mb_convert_encoding and iconv parameters is different, so be sure to pay attention.

Attached are the simple usage of two functions:

mb_convert_encoding
string mb_convert_encoding ( string $str , string $to_encoding [, mixed $from_encoding ] )
第一个参数：要处理的字符串
第二个参数：目标编码
第三个参数：内容原编码，它可以是一个 array 也可以是逗号分隔的枚举列表<?php$instr = &#39;测试&#39;;
// GBK转UTF-8$outstr = mb_convert_encoding($instr,&#39;UTF-8&#39;,&#39;GBK&#39;,);
$str = mb_convert_encoding($instr, "UCS-2LE", "JIS, eucjp-win, sjis-win");?>

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##Personal suggestions when encountering transcoding problems It is safer to use mb_convert_encoding.

mb_convert_variables

mb_convert_variables —

Convert the character encoding of one or more variables

mb_convert_variables ( $to_encoding , $from_encoding , &$vars [, mixed &$... ] )

will The encoding of variable vars is converted from from_encoding to encoding to_encoding.

mb_convert_variables() 会拼接变量数组或对象中的字符串来检测编码，因为短字符串的检测往往会失败。因此，不能在一个数组或对象中混合使用编码。

to_encoding  将 string 转换成这个编码。

from_encoding 可以指定为一个 array 或者逗号分隔的 string，它将尝试根据 from-coding 来检测编码。 当省略了 from_encoding，将使用 detect_order。
vars 是要转换的变量的引用。 参数可以接受 String、Array 和 Object 的类型。 mb_convert_variables() 假设所有的参数都具有同样的编码。
额外的 vars。

返回值 ：
成功时返回转换前的字符编码，失败时返回 FALSE。

实例：<?php/* 转换变量 $post1、$post2 编码为内部（internal）编码 
*/$interenc = mb_internal_encoding();$inputenc = mb_convert_variables($interenc,
 "ASCII,UTF-8,SJIS-win", $post1, $post2);?>

##mb_internal_encoding mb_internal_encoding — Set/get internal character encoding

mixed mb_internal_encoding ([ string $encoding = mb_internal_encoding() ] )

参数 ：
encoding 字符编码名称使用于 HTTP 输入字符编码转换、HTTP 输出字符编码转换、mbstring 模块系列函数字符编码转换的默认编码。 
返回值 ：
如果设置了 encoding，则成功时返回 TRUE， 或者在失败时返回 FALSE。 In this case, the character encoding for multibyte regex is NOT changed. 如果省略了 encoding，则返回当前的字符编码名称。

<?php/* 设置内部字符编码为 UTF-8 */mb_internal_encoding("UTF-8");/* 显示当前的内部字符编码*/echo mb_internal_encoding();?>

Detailed explanation of mb_detect_encoding: mb_detect_encoding —

Encoding of detected characters

string mb_detect_encoding ( string $str [, mixed $encoding_list = mb_detect_order() [, bool $strict = false ]] )

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检测字符串 str 的编码。

参数 
str    待检查的字符串。
encoding_list   是一个字符编码列表。 编码顺序可以由数组或者逗号分隔的列表字符串指定。
如果省略了 encoding_list 将会使用 detect_order。strict    strict 指定了是否严格地检测编码。 默认是 FALSE。
返回值
检测到的字符编码，或者无法检测指定字符串的编码时返回 FALSE。

字符串编码未知的情况下对字符串进行编码： 
1、无论字符串编码是什么，均转换为gbk

function getSafeStr($str){
    $s1 = iconv('utf-8','gbk//IGNORE',$str);    $s0 = iconv('gbk','utf-8//IGNORE',$s1);    if($s0 == $str){        return $s1;
    }else{        return $str;
    }
}

2、无论字符串编码是什么，均转换为utf-8

function getSafeStr($str){
    $s1 = iconv('gbk','utf-8//IGNORE',$str);    $s0 = iconv('utf-8','gbk//IGNORE',$s1);    if($s0 == $str){        return $s1;
    }else{        return $str;
    }
}

获取字符串编码方法：

function getcode($str){
    $s1 = iconv('utf-8','gbk//IGNORE',$str);    $s0 = iconv('gbk','utf-8//IGNORE',$s1);    if($s0 == $str){        return 'utf-8';
    }else{        return 'gbk';
    }
}

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