How to solve garbled php strings

Solutions to garbled php strings: 1. Replace gb2312 with utf-8 through iconv; 2. Convert the encoding through the mb_convert_encoding function.

The operating environment of this article: Windows7 system, PHP7.1 version, DELL G3 computer

How to solve the garbled php string? Problems with character encoding conversion of PHP iconv() function

The iconv function library in PHP can complete the conversion between various character sets and is an indispensable basic function library in PHP programming; but sometimes iconv For some data, there will be less transcoding for no reason. For example, an error will occur when converting the character "—" to gb2312.

Let’s take a look at the usage of this function.

The simplest application is to replace gb2312 with utf-8:

$text=iconv("GB2312","UTF-8",$text);

In the process of using $text=iconv("UTF-8","GB2312",$text), if When encountering some special characters, such as "—", "." in English names, etc., the conversion will be interrupted. The text after these characters cannot be converted further.

To solve this problem, you can use the following code to achieve it:

$text=iconv("UTF-8","GBK",$text);

You read that right, it’s that simple, just write GBK instead of using gb2312.

There is another method, the second parameter, add //IGNORE, ignore the error, as follows:

iconv("UTF-8","GB2312//IGNORE",$data);

There is no specific comparison between these two methods, I feel that the first one (GBK instead of gb2312 ) method is better.

Instructions for iconv() in the php manual:

iconv
(PHP 4 >= 4.0.5, PHP 5)
iconv – Convert string to requested character encoding
Description
string iconv ( string in_charset, string out_charset, string str )
Performs a character set conversion on the string str from in_charset to out_charset. Returns the converted string or FALSE on failure.
If you append the string //TRANSLIT to out_charset transliteration is activated. This means that when a character can't be represented in the target charset, it can be approximated through one or several similarly looking characters. If you append the string //IGNORE, characters that cannot be represented in the target charset are silently discarded. Otherwise, str is cut from the first illegal character.

When using this function to convert string encoding, you need to pay attention to the fact that if you convert utf-8 to gb2312, a string may appear Truncation occurs. At this time, you can use the following method to solve the problem:

$str=iconv('utf-8',"gb2312//TRANSLIT",file_get_contents($filepath));

That is, add the red part in the second parameter, which means: if no characters matching the source encoding are found in the target encoding, similar characters will be selected. Make the conversion. You can also use the //IGNORE parameter here to ignore characters that cannot be converted.

ignore means to ignore errors during conversion. Without the ignore parameter, all strings following this character cannot be saved.

iconv is not the default function of php, and it is also a module installed by default. It needs to be installed before it can be used.

If it is windows2000 php, you can modify the php.ini file and remove the ";" before extension=php_iconv.dll. At the same time, you need to copy the iconv.dll under your original php installation file to your Under winnt/system32 (if your dll points to this directory). In the Linux environment, using static installation, just add an additional item --with-iconv when configure. The iconv item can be seen in phpinfo. (Linux7.3 Apache4.06 php4.3.2).

Introduction to mb_convert_encoding and iconv functions

mb_convert_encoding This function is used to convert encodings. I used to not understand the concept of program coding, but now I seem to understand a little bit. However, English generally does not have encoding problems, only Chinese data will have this problem. For example, when you use Zend Studio or Editplus to write a program, you use gbk encoding. If the data needs to be entered into the database, and the database encoding is utf8, then the data must be encoded and converted, otherwise it will become garbled when entering the database. .

Make a GBK To UTF-8:

<?php 
header("content-Type: text/html; charset=Utf-8"); 
echo mb_convert_encoding("妳係我的友仔", "UTF-8", "GBK"); 
?>

Then make a GB2312 To Big5:

<?php 
header("content-Type: text/html; charset=big5"); 
echo mb_convert_encoding("你是我的朋友", "big5", "GB2312"); 
?>

However, to use the above function, you need to install it, but you need to enable the mbstring extension library first.

string mb_convert_encoding (string str, string to_encoding [, mixed from_encoding]) You need to enable the mbstring extension library first. In php.ini, remove the ; extension=php_mbstring.dll in front of mb_convert_encoding to specify multiple input encodings. , it will automatically identify based on the content, but the execution efficiency is much worse than iconv;

string iconv (string in_charset, string out_charset, string str) Note: The second parameter, in addition to specifying the encoding to be converted to In addition, you can also add two suffixes: //TRANSLIT and //IGNORE. //TRANSLIT will automatically convert characters that cannot be directly converted into one or more approximate characters. //IGNORE will ignore characters that cannot be converted. The default effect is to truncate from the first illegal character.

Generally use iconv. Only use the mb_convert_encoding function when you are unable to determine what the original encoding is, or when iconv cannot be displayed normally after conversion.

$content = iconv("GBK", "UTF-8″, $content);
$content = mb_convert_encoding($content, "UTF-8″, "

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