How to differentiate between php constant and string

Question

I am storing db credentials in a file as constant and including in another file. I am using PDO to connecting with database. But It's unable to differentiating between string and constant variables. So how to differentiate it to connect with database? This is my code line-

$db = new PDO("mysql:hostname='DB_HOST'; dbname='P_DB'", "'DB_USER'", "'DB_PASSKEY'");

Nick · Accepted Answer · 2021-01-25 06:09:50Z

1

PHP constants cannot be instantiated within a string; you need to concatenate them to the string, or, in the case of your user and password fields, just reference the constant:

$db = new PDO("mysql:hostname=" . DB_HOST . ";dbname=" . P_DB, DB_USER, DB_PASSKEY);

answered Jan 25, 2021 at 6:09

Nick

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2 Comments

MdFarzan Over a year ago

You are right. Thank You. But there should be something which help to differentiate.

Nick Over a year ago

@MdFarzan this is why PHP8 will now flag an error if you use something like DB_USER without quotes but without defining it as a constant first.

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