What is warning – “cannot modify header information – headers already sent”?


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Explain what is the difference between $var and $$var?

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Do you know what is the differences between $a != $B and $a !== $B?

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hi recently i had faced an interview in that they asked me that php have faced the problem of y2k so which one is that year like 2030,2059 not remember exact year anybody will tell me pls?

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why header() gives the error like header already sent in php please explain in brief

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Is key in array php?

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