a newbie parsing error

[mynmonic]

inside a php scripts I have this statement:

$totalamount=$totalamount+20;

where the $totalamount was a integer value in it(not 1), but after this summing statement the $totalamount comes out with 21.

I changed the statement to :

$totalamout=$totalamount;

and the $totalamount become 1.

Can anyone tell me why this statement will turn the initial value of the variable to 1 ?

[mynmonic]

Ok now I get more clues, when the value of $totalamount is larger than 1000, the statement '$totalamount=$totalamount' will do the wrong thing.

It works find when the value is <=1000, so the question now is, why?

[WiZARD]

inside a php scripts I have this statement:

$totalamount=$totalamount+20;

where the $totalamount was a integer value in it(not 1), but after this summing statement the $totalamount comes out with 21.

I changed the statement to :

$totalamout=$totalamount;

and the $totalamount become 1.

Can anyone tell me why this statement will turn the initial value of the variable to 1 ?

What is your's first value of $totalamount?

[mynmonic]

I thought it is a integer but now I noticed it is actually a string of number, since I used the number_format on it.

Just I donno why, if $totalamount=1001 and it's a string, so after '$totalamount=$totalamount' the $totalamount will be turned into 1?