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Many PHP frameworks such as Codeigniter on production environment opt-out to hide any PHP related error message. Also, that applies on other PHP frameworks as well such as Symphony and Laravel (with the appropriate settings).

So I wanted to know if this behavior increases slightly my web-app's security and how is security in increased.

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You should never allow end users to gain insights into the inner workings of your system. Doing so will allow a potential attacker to streamline his attacks and increase the chance that they will be successful.

For more information have a look at this: https://cwe.mitre.org/data/definitions/200.html

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