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[Cliff Hirsch]

I have been looking through the PHP manual for a definitive answer
regarding expression evaluation in an if statement, specifically
regarding the following:

$array = array('a' => 'alpha', 'b' => 'beta', 'c' => 'charlie');
if (isset($array['d']) && ($array['d'] === 'delta'))
  echo 'Its a wonderful life';

This is ok, but the following will generate a parse error:

if (($array['d'] === 'delta') && isset($array['d'])) 

Obviously the first example doesn't evaluate the 2nd expression,
eliminating the non-existent key parsing error. My question is, can I
rely on this? Is the precedence and abortion of the balance of the if
expression guaranteed in this and future releases of PHP?

Cliff Hirsch