Strict Standards: Only variables should be passed by reference in C:\xampp\htdocs\cart\ajax\tips.php on line 8
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Can't really help you without seeing what the code before, on and after line 8 looks like.
Without seeing code I'm assuming your passing something like the return of explode() directly into another function. e.g.
$foo = array_shift( explode( '.', $bar ) );
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