How to intercept php string

1. Chinese interception: mb_substr().

 mb_substr(s t r , str,str,start,l e n g t h , length,length,encoding)

Example

 echo mb_substr('This is really nice',0,3,'utf-8'); //Output this true

2. English interception: use the substr() function. If the intercepted string is multiple bytes, garbled characters will appear.

Under utf8 encoding, since one Chinese character occupies 3 bytes.

 $str = 'hello';
echo substr($str,1,2);//output el

3. $str[0], treats strings as character sets, not applicable to Chinese.

 $str = 'hello';
echo $str[0];//output h

The above is how to intercept PHP strings. I hope it will be helpful to everyone.