Expression | gettype() | empty() | is_null() | isset() | boolean : if($x) |
---|---|---|---|---|---|
$var = ''; | string | true | false | true | false |
$var = null; | NULL | true | true | false | false |
var $x; | NULL | true | true | false | false |
$var is undefined | NULL | true | true | false | false |
$var = array(); | array | true | false | true | false |
$var = false; | bool | true | false | true | false |
$var = true; | bool | false | false | true | true |
$var = 1; | int | false | false | true | true |
$var = 10; | int | false | false | true | true |
$var = 0; | int | true | false | true | false |
$var = -1; | int | false | false | true | true |
$var = '1'; | string | false | false | true | true |
$var = '0'; | string | true | false | true | false |
$var = '-1'; | string | false | false | true | true |
$var = 'test'; | string | false | false | true | true |
$var = 'true'; | string | false | false | true | true |
$var = 'false'; | string | false | false | true | true |
Created
January 22, 2019 09:00
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