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PHP $hash = hash('sha256', $string); Example: correct table definition sql ALTER TABLE my_table ADD COLUMN sha256_hash VARCHAR(64) NOT NULL; Then populate it with: sql UPDATE my_table SET sha256_hash = CONVERT(VARCHAR(64), HASHBYTES('SHA2_256', plain_string_field), 2); This produces uppercase hex, which is fully compatible with PHP’s lowercase hex. ✔ Final recommendation Use VARCHAR(64) for storing SHA‑256 hashes generated by PHP.
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