MySQL/PDO truncates the data

Question

$book is a 7kb string. If this query is executed using PHP PDO exec, the monograph column (LONGTEXT) data gets truncated at 6765 chara

Answer 1

There are two points to be made here. One is that ideally all character encodings must be UTF8 - that's server, client, connection, and table. Two is that PHP's strlen function counts bytes, not characters.

Your table character set may not be set to UTF8. You can do

SHOW CREATE TABLE chemicals;

to check that. You should also add these to your my.cnf:

[mysqld]
character-set-client=utf8
character-set-results=utf8

Read more about MySQL character sets here:

MySQL character sets