PHP determines that the input does not exceed the length range of mysql's varchar field_PHP tutorial

But if under utf-8 encoding, a Chinese character occupies 3 characters in length, such as the string $str=”Hello!!”;

If you use the strlen function to judge, the length is 11 , just exceeds the length of varchar, but in fact this is not the case. If you directly execute the insert statement in phpmyadmin, this string can be inserted!

For the database, its length is 5, so how do we use PHP to get this length? Use the iconv_strlen() function!

echo iconv_strlen($str,'utf-8′);

Note that the second parameter is the current character set, so the results you get will be based on different character sets. Characters account for one length calculation!

The above statement will output 5. How about it? Can you judge it?

http://www.bkjia.com/PHPjc/323649.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/323649.htmlTechArticleBut if under utf-8 encoding, a Chinese character occupies 3 characters in length, such as the string $str =”Hello!!”; If you use the strlen function to judge, the length is 11, just beyond varch...