How to intercept Chinese string from the first digit in php

In PHP, you can use the mb_substr() function to intercept a Chinese string from the specified position. This function can intercept a substring of a specified length starting from a specified position of a string, and set the character encoding; syntax "mb_substr (specified string, interception starting position, interception length, character encoding)".

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

When processing strings, sometimes we The string needs to be intercepted. In PHP, intercepting strings can be achieved through PHP's predefined functions substr() and mb_substr()

Among them, the substr() function is not very friendly to Chinese processing, while the mb_substr() function is used for Intercept Chinese string.

mb_substr() function can intercept a specified part from a string. Different from the substr() function, the mb_substr() function is not only valid for English characters, but also for Chinese characters. Its syntax format is as follows :

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

Return value: Returns the extracted part of the string, returns FALSE if it fails, or returns an empty string.

Example: Use the mb_substr() function to intercept a Chinese string of specified length.

'; echo mb_substr($str, -19,null,"utf-8").'
'; echo mb_substr($str, 4, 6,"utf-8").'
'; echo mb_substr($str, 4, -16,"utf-8").'
'; echo mb_substr($str, -19, -13,"utf-8").'
'; echo mb_substr($str, -19, 6,"utf-8").'
'; var_dump(mb_substr($str, 40,null,"utf-8")); var_dump(mb_substr($str, 4, null,"utf-8")); ?>

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