How to convert string to utf-8 encoding in php

php method to convert a string to utf-8 encoding: first use mb_detect_encoding() to get the original encoding of the string; then use "mb_convert_encoding(string, 'UTF-8', the original encoding of the string )" statement can be converted.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php will encode any string Convert content to utf-8

function str_to_utf8 ($str = '') {
$current_encode = mb_detect_encoding($str, array("ASCII","GB2312","GBK",'BIG5','UTF-8'));  //获取原来编码
$encoded_str = mb_convert_encoding($str, 'UTF-8', $current_encode); //将原来编码转换成utf-8 大小写都可以
return $encoded_str;
}

Related function description:

1. mb_detect_encoding()

mb_detect_encoding — Detect character encoding

Syntax:

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

Parameters:

• str

  The string to be checked.

• encoding_list

  encoding_list is a character encoding list. The encoding order can be specified by an array or a comma-separated list of strings.

  If encoding_list is omitted, detect_order will be used.

• strict

  strict specifies whether to strictly detect encoding. The default is false.

Return value:

• The detected character encoding, or false when the encoding of the specified string cannot be detected.

2. mb_convert_encoding()

mb_convert_encoding — Conversion character encoding

Syntax:

mb_convert_encoding ( array|string $string , string $to_encoding , array|string|null $from_encoding = null )

Convert the character encoding of string type str from optional from_encoding to to_encoding. When the argument string is an array, all its string values ​​will be converted recursively.

Parameters

• string

  The string or array to be encoded.

• to_encoding

  string The encoding type to be converted to.

• from_encoding

  Specified by character code name before conversion. It can be an array or a comma-separated list of enumerations. If from_encoding is not provided, the internal encoding will be used.

Return value:

• Encoded string. Returns the encoded string or array on success, or false on failure.

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