PHP implements Chinese string interception without garbled characters

Substr is often used in PHP to intercept strings, but when we use it to intercept Chinese characters, garbled characters will occur , for example: (Recommended learning: PHP programming from entry to proficiency)

<?php
$mystring="今天天气真好";
$mysubstring=substr($mystring,0,2);
echo $mysubstring;
?>

The output result is �;

Cause analysis:substr function The prototype is: string substr ( string $string , int $start [, int $length ] ), where $length represents the returned byte length, and one Chinese character occupies two bytes. For a UTF-8 Chinese character, it will be It is treated as 3 bytes.

<?php
$length=strlen($mystring);echo $length;//输出结果为18
?>

That is to say, we can use $length to be 3, which will successfully return the word "Jin". In this case, if Chinese and English are mixed, we need to calculate $length carefully.

So is there a better solution?

Php provides additional functions mb_strlen and mb_substr

<?php
$length=mb_strlen($mystring);
$mysub=mb_substr($mystring,0,4);
echo "the length is：$length,","the substr is：$mysub";
?>

The output result is: the length is: 6, the substr is: today’s weather

## The #mb_strlen function prototype is int mb_strlen(string string_input, string encode); encode defaults to UTF-8, which will count Chinese characters encoded for UTF-8 as one

Note: mb_strlen and mb_substr are not core functions of PHP. You need to open extension=php_mbstring.dll in php.ini before using them

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