Solve the problem of intercepting Chinese strings with PHP

If PHP intercepts a string in English, it is easy. Just use substr directly, and generally there will be no garbled characters. Chinese is a bit troublesome.
Two solutions are given below:
(1) Directly use the Multi-Byte function Just use the mb_substr(); function of the library. The example code is as follows

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This method is simple, fast, safe, beautiful, and tempting. ． ． Anyway, any good words can be used to describe it, but unfortunately my GoDaddy host does not support it, so I have to find another way out
(2) Customize the Chinese string interception function, basically just write a function imitating mb_substr and call it directly, as follows The code I found for me is actually very simple

=161)) //是汉语 { $start_index+=2; } else //是英文 { $start_index+=1; } } $chr_index=$start_index; //截取 for ($i=0;$i<$len;$i++) { $asc=ord($str_input{$chr_index}); if ($asc>=161) { $return_str{$i}=chr($asc); $return_str{$i+1}=chr(ord($str_input{$chr_index+1})); $len+=1; //结束条件加1 $i++; //位置偏移量加1 $chr_index+=2; continue; } else { $return_str{$i}=chr($asc); $chr_index+=1; } } return trim($return_str); }//en