A script to change all tables and fields to the utf-8-bin collation in MYSQL

Can be done in a single command (rather than 148 of PHP):

mysql --database=dbname -B -N -e "SHOW TABLES" \
| awk '{print "SET foreign_key_checks = 0; ALTER TABLE", $1, "CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci; SET foreign_key_checks = 1; "}' \
| mysql --database=dbname &

You’ve got to love the commandline…
(You might need to employ the --user and --password options for mysql).

EDIT: to avoid foreign key problems, added SET foreign_key_checks = 0; and SET foreign_key_checks = 1;