[PHP-NOTES] note 130174 added to function.crypt

Most (old) examples here show how to generate a salt. But it's better to use the password_hash(...) function for this. This is mentioned in the 3th paragraph ("Use of password_hash() is encouraged."). password_hash(...) will automatically generate a salt that's concatenated to the generated hash string.

The function password_verify(...) will automatically use the concatenated salt to compare the hashes. So there's no need to generate a salt yourself at all.
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