make switch use === comparison not == comparison In PHP
Is there anyway to make it so that the following code still uses a switch and returns b not a? Thanks!
$var = 0;
switch($var) {
case NULL : return 'a'; break;
default : return 'b'; break;
}
Using if statements, of course, you'd do it like this:
$var = 0;
if($var === NULL) return 'a';
else return 'b';
But for more complex examples, this becomes verbose.
Answer
Sorry, you cannot use a === comparison in a switch statement, since according to the switch() documentation:
Note that switch/case does loose comparison.
This means you'll have to come up with a workaround. From the loose comparisons table, you could make use of the fact that NULL == "0" is false by type casting:
<?php
$var = 0;
switch((string)$var)
{
case "" : echo 'a'; break; // This tests for NULL or empty string
default : echo 'b'; break; // Everything else, including zero
}
// Output: 'b'
?>