How to convert string to utf8 in php

php method to convert a string to utf8: first create a PHP sample file; then directly use "iconv('GB2312', 'UTF-8', $str);" to convert the string encoding from Just convert GB2312 to UTF8.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

PHP converts the string from GBK to UTF8 through iconv Character set

1. Introduction to iconv()
The iconv function can convert a known character set file into another known character set file. For example: Convert from GB2312 to UTF-8.
iconv function is built in php5, and the GB character set is turned on by default.
2. iconv() error
iconv will make an error when converting the character "-" to gb2312. The solution is to add "//IGNORE" after the encoding that needs to be converted, which is the second parameter of the iconv function. After. As follows:

The code is as follows:

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

ignore means to ignore errors during conversion. Without the ignore parameter, all strings following this character cannot be saved.
3. iconv() example
Example 1:

The code is as follows:

<?php 
　　echo $str= ‘你好,这里是卖咖啡!&#39;; 
　　echo &#39;<br />&#39;; 
　　echo iconv(&#39;GB2312&#39;, &#39;UTF-8&#39;, $str); //将字符串的编码从GB2312转到UTF-8 
　　echo &#39;<br />&#39;; 
　　echo iconv_substr($str, 1, 1, &#39;UTF-8&#39;); //按字符个数截取而非字节 
　　print_r(iconv_get_encoding()); //得到当前页面编码信息 
　　echo iconv_strlen($str, &#39;UTF-8&#39;); //得到设定编码的字符串长度 
?>

Example 2:
If your PHP file is UTF-8 encoded , then the following code can be output correctly:

The code is as follows:

<?php 
　　$str=&#39;我爱百度&#39;; 
　　$utf=&#39;&#39;; 
　　for ($i=0;$i<strlen($str);$i++) $utf.=sprintf("%%%02X",ord(substr($str,$i,1))); 
　　echo $utf; 
?>

If your PHP file is GB, then the following code can work:

The code is as follows:

<?php 
　　$str=&#39;我爱百度&#39;; 
　　$str=iconv("GBK", "UTF-8", $str); 
　　$utf=&#39;&#39;; 
　　for ($i=0;$i<strlen($str);$i++) $utf.=sprintf("%%%02X",ord(substr($str,$i,1))); 
　　echo $utf; 
?>

In the above case, the program output is:
我爱百度

Recommended learning: "PHP Video Tutorial 》

The above is the detailed content of How to convert string to utf8 in php. For more information, please follow other related articles on the PHP Chinese website!