Php operators help needed

Question

I'm from C++ background and newbie in php, somebody please help me with the difference between the two:

$totalupdatedrows = (count($rows) == 1 and !isset($rows[0]->updated_by))  ? 0 : count($rows);


$totalupdatedrows = count($rows) == 1 and !isset($rows[0]->updated_by)  ? 0 : count($rows);

assume count($rows) = 1 and $rows[0]->updated_by=null. Please see that first one has only one extra wrapper parentheses.

I'm getting correct result from the first statement. I expect to get result of 0 which is the result of the first one and not the second one. I can't figure out the difference.

alex · Accepted Answer · 2011-12-22 04:55:40Z

3

and has lower precedence than the ternary operators (? and :). Therefore, you need to wrap it in parenthesis (( and )) so it is evaluated first.

Note that if you had used &&, you would not need to use the extra parenthesis.

answered Dec 22, 2011 at 4:55

alex

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1 Comment

user774250 Over a year ago

?: has the lowest precedence as in C++ but in PHP "and" is even below it. I better use && to be compatible with C++.

Jessedc · Accepted Answer · 2011-12-22 04:58:47Z

2

Checkout the PHP documentation - Operator Precedence and is nearly last.

If you change your and to && it will sit at a higher order than ?:

answered Dec 22, 2011 at 4:58

Jessedc

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