CODEWITHSUNDEEP
php
tmartin314
tmartin314

Reputation: 4171

Explain php if statement

Can someone please explain in detail what these if statements are doing?

What does the three === signs to in the first one, and What does the single & in the second mean?

$aProfile = getProfileInfo($iId);
    if($aProfile === false)
        return false;

    if(!((int)$aProfile['Role'] & $iRole))
        return false;

Upvotes: 1

Views: 134

Answers (2)

Hammerite
Hammerite

Reputation: 22350

=== tests for type-safe equality.

'3' == 3 will return true, but '3' === 3 will not, because one's a string and one's an integer. Similarly, null == 0 will return true, but null === 0 will not; 10.00 == 10 will return true, but 10.00 === 10 will not.

& is the bitwise AND operator. It returns a bitmask in which a bit is set if both the corresponding bits are set from the original two bitmasks.

For example:

$x = 5;
$y = 17;
echo $x & $y;

causes 1 to be echoed. $x is ...000101, $y is ...010001. The only bit that is set in both of them is the rightmost one, so you get ...000001, which is 1.

Upvotes: 8

treeface
treeface

Reputation: 13351

Here's a good guide to PHP operators:

http://www.tuxradar.com/practicalphp/3/12/3

See the section on bitwise operators for info on the &.

Upvotes: 3

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