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Reference – What does this symbol mean in PHP?
What does this line do?
$theVal = ((($theR << 8) | $theG) << 8) | $theB;
What do the << and | do?
Those are Bitwise operators that allow evaluation and manipulation of specific bits within an integer.
$a | $b Or Bits that are set in either $a or $b are set.
$a << $b Shift left Shift the bits of $a $b steps to the left (each step means “multiply by two”)
$a >> $b Shift right Shift the bits of $a $b steps to the right (each step means “divide by two”)