How to convert characters in php

How to convert characters to encoding in php:

The first one, iconv() function:

//iconv('目标编码', '原编码', '字符串')
$encode = mb_detect_encoding( $str, array('ASCII','UTF-8','GB2312','GBK'));
if ( !$encode =='UTF-8' ){
     $str = iconv('UTF-8',$encode,$str);
}

The second one The third type, mb_convert_encoding()

//mb_convert_encoding('要转编码的字符串','目标编码','原编码')
//mb_detect_encoding('字符串')：
mb_convert_encoding($str,'utf-8',mb_detect_encoding($str))

The third type, convert to base64 string

base64_encode($canonical_request)

The fourth type, convert URL encoding

// urlencode()函数原理就是首先把中文字符转换为十六进制，然后在每个字符前面加一个标识符%，对字符串中除了 -_. 之外的
所有非字母数字字符都将被替换成百分号（%）后跟两位十六进制数，空格则编码为加号（+）。
urlencode('URL字符串')

// urldecode()函数与urlencode()函数原理相反，用于解码已编码的 URL 字符串，其原理就是把十六进制字符串转换为中文字符。

urldecode('URL字符串')

Recommended tutorial: "php Tutorial》

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