openssl_random_pseudo_bytes 函数输出二进制数据，而我试图将输出存储在字符类型不同的数据库字段中，错误地将其视为

The openssl_random_pseudo_bytes function outputs binary data, and I was trying to store the output in a database field of data type character varying, mistakenly treating it like a string.

bytea 是PostgreSQL数据库中字段的正确数据类型。

bytea is the correct data type for the field in the PostgreSQL database.

http://www.postgresql.org/docs/9.2/interactive/datatype-binary.html

更新：另外，看来您需要在输出上使用 pg_escape_bytea 才能将二进制数据实际插入数据库中。

Update: Also, it seems you need to use pg_escape_bytea on the output to be able to actually insert the binary data into the database.

感谢注释中的减少， lechlukasz 和 VolkerK 。