What should I do if php uses the substr() function to intercept a string and it appears garbled?

php uses the substr() function to intercept strings and the solution to garbled characters is: use the mb_substr() function, because the substr() function only targets English characters. Specific usage: [mb_substr($str,0,2,"UTF8")].

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Cause analysis:

substr() function Only for English characters, if we want to split Chinese characters, we need to use the mb_substr() function.

Function introduction:

mb_substr() function returns a part of the string.

Syntax:

mb_substr(string $str, int $start[,int $length = NULL[, string $encoding = mb_internal_encoding()]]):string

Parameter introduction:

• str Required. Extract a substring from this string

• #start Required. Specifies where to start the string

• length Optional. Specifies the length of the string to be returned. The default is until the end of the string

• encoding Optional. Character Encoding. If omitted, the internal character encoding is used

Return value:

Returns the extracted portion of the string, or FALSE on failure, or an empty string.

Code implementation:

<?php
header("Content-Type: text/html; charset=utf-8");
$str="网站工作室欢迎您！";
echo mb_strlen($str,"UTF8")."<br>";
echo mb_substr($str,0,2,"UTF8")."<br>";
?>

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