Posted by howa on 02/09/07 02:52

> In other words: the engine is smarter then you think.
> --

the bottom line is: the engine created dummy variables for storing two
copies of data, e.g.


<?php

function conv_md5( $data ) {

return md5($data);
}

$data = "abc";

echo conv_md5( $data );
echo $data;


?>

the engine never know we will use the variable $data later, so it
always created allocated memory for storing the result of conv_md5(),
only we know and can force to use return by reference.

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