Description:
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In the documentation of the setCookie() function the doc says that setCookie()'s expiry param takes input as time() + some value, which is in unix seconds, but in its example it takes time() + 60*60 *24 * 30 and comments it as 30 day time perion but the time mentioned is 1/60 of that time period, as it should multiply 60 more to it.
I found that this mistake was multiple time in the documentation, have a look there. And Thanks for your awesome PHP.

Test script:
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setCookie("name","value", "/", time() + 60*60 *24 * 30); # This is 1/60th of 30 days
#it should be
setCookie("name","value", "/", time() + 60*60 *24 * 30 * 60); # One more 60 multiplied