note 64321 deleted from language.operators.logical by colder

Note Submitter: jhooks ---- >> I have read a few of these responses and quite honestly didn't find one that explained >> the differences between the "||" and "OR" operators. The difference is explained in the link to on operator precedence. The '||' operators are evaluated before assignment ('='), whereas the 'or' operators are evaluated after the assignment. In your second example you are telling PHP to first assign the result of '(choice1 != false ? 'hah' : 'boo')' to $val, then 'or' it against the rest of the statement. Try the example below and you will see what I mean (note the extra brackets to enforce precedence): <?php define ('choice1', false); define ('choice2', "dog"); define ('default1', "other"); $val = array(); $val["Test 1"] = (choice1 != false ? 'hah' : 'boo') || (choice2 != false ? 'hah2' : 'boo2') || (default1 != false ? 'hah3' : 'boo3'); $val["Test 1b"] = ((choice1 != false ? 'hah' : 'boo') || (choice2 != false ? 'hah2' : 'boo2') || (default1 != false ? 'hah3' : 'boo3')); $val["Test 2"] = (choice1 != false ? 'hah' : 'boo') or (choice2 != false ? 'hah2' : 'boo2') or (default1 != false ? 'hah3' : 'boo3'); $val["Test 2b"] = ((choice1 != false ? 'hah' : 'boo') or (choice2 != false ? 'hah2' : 'boo2') or (default1 != false ? 'hah3' : 'boo3')); foreach ( $val as $test => $result ) { print ( "$test : " ); var_dump ( $result ); print "<br />\n<br />\n"; } ?>