Description:
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You will get error 500 Internal server error if you put comment after 
param in php.ini

Reproduce code:
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in php.ini put comment at the same line with param:

max_execution_time = 30 ; Maximum execution time of each script, in seconds

Expected result:
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In older versions of php such code work properly

Actual result:
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You will get error Premature end of script headers