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>&#13;     The basic assignment operator is "=". Your first inclination might
     be to think of this as "equal to". Don't. It really means that
     the the left operand gets set to the value of the expression on the
     rights (that is, "gets set to").
    </P
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>&#13;     The value of an assignment expression is the value assigned. That
     is, the value of "$a = 3" is 3. This allows you to do some tricky
     things: <DIV
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>  1&nbsp;
  2&nbsp;$a = ($b = 4) + 5; // $a is equal to 9 now, and $b has been set to 4.
  3&nbsp;</PRE
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>&#13;     In addition to the basic assignment operator, there are "combined
     operators" for all of the binary arithmetic and string operators
     that allow you to use a value in an expression and then set its
     value to the result of that expression. For example: <DIV
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>  1&nbsp;
  2&nbsp;$a = 3;
  3&nbsp;$a += 5; // sets $a to 8, as if we had said: $a = $a + 5;
  4&nbsp;$b = "Hello ";
  5&nbsp;$b .= "There!"; // sets $b to "Hello There!", just like $b = $b . "There!";
  6&nbsp;</PRE
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>&#13;	Note that the assignment copies the original variable to the new
	one (assignment by value), so changes to one will not affect the
	other. This may also have relevance if you need to copy something
	like a large array inside a tight loop. PHP4 supports assignment
	by reference, using the <TT
CLASS="computeroutput"
>$var =
	&#38;$othervar;</TT
> syntax, but this is not possible
	in PHP3. 'Assignment by reference' means that both variables end
	up pointing at the same data, and nothing is copied anywhere.
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