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Chapter 12 - when to use '@'

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I'm comparing the two Scripts 12.1 and 12.2 and notice line 12

if ($dbc = mysqli_connect('localhost', 'username', 'password', 'myblog')) { // Script 12.1

if ($dbc = @mysqli_connect('localhost', 'username', 'password', 'myblog')) { // Script 12.2

What is the use of the '@'?

What is the difference between with and without '@' on @mysqli_connect() and when to use the '@'?

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