General typing gettype() empty() is_null() isset() (bool) if( $x ) {..} General typing
General typing gettype() empty() is_null() isset() (bool) if( $x ) {..} General typing
$x = null : ( = NULL )
 ‘NULL’ true true false false false $x = null : ( = NULL )
$x = null : ( = NULL )
 ‘NULL’ true true false false false $x = null : ( = NULL )
$x = bool : ( = false )
 ‘boolean’ true false true false false $x = bool : ( = false )
$x = bool : 1 ( = true )
 ‘boolean’ false false true true true $x = bool : 1 ( = true )
$x = int : 1
 ‘integer’ false false true true true $x = int : 1
$x = int : 0
 ‘integer’ true false true false false $x = int : 0
$x = int : -1
 ‘integer’ false false true true true $x = int : -1
$x = int : 42
 ‘integer’ false false true true true $x = int : 42
†i8$x = int : 13369593
 ‘integer’ false false true true true †i8$x = int : 13369593
†i9$x = int : 42
 ‘integer’ false false true true true †i9$x = int : 42
†ia$x = int : 57
 ‘integer’ false false true true true †ia$x = int : 57
$x = float : 1.3
 ‘double’ false false true true true $x = float : 1.3
$x = float : 0.005
 ‘double’ false false true true true $x = float : 0.005
$x = float : 0
 ‘double’ true false true false false $x = float : 0
$x = float : -1.3
 ‘double’ false false true true true $x = float : -1.3
†f5$x = float : NAN
 ‘double’ false false true true true †f5$x = float : NAN
†f6$x = float : NAN
 ‘double’ false false true true true †f6$x = float : NAN
†f7$x = float : -INF
 ‘double’ false false true true true †f7$x = float : -INF
†f8$x = float : INF
 ‘double’ false false true true true †f8$x = float : INF
†f9$x = float : 123450000
 ‘double’ false false true true true †f9$x = float : 123450000
$x = string[0] : ‘’
 ‘string’ true false true false false $x = string[0] : ‘’
$x = string[1] : ‘ ’
 ‘string’ false false true true true $x = string[1] : ‘ ’
$x = string[2] : ‘ 1’
 ‘string’ false false true true true $x = string[2] : ‘ 1’
$x = string[3] : ‘ 3 ’
 ‘string’ false false true true true $x = string[3] : ‘ 3 ’
$x = string[1] : ‘1’
 ‘string’ false false true true true $x = string[1] : ‘1’
$x = string[1] : ‘0’
 ‘string’ true false true false false $x = string[1] : ‘0’
$x = string[2] : ‘-1’
 ‘string’ false false true true true $x = string[2] : ‘-1’
$x = string[2] : ‘42’
 ‘string’ false false true true true $x = string[2] : ‘42’
$x = string[3] : ‘1.3’
 ‘string’ false false true true true $x = string[3] : ‘1.3’
$x = string[3] : ‘0.0’
 ‘string’ false false true true true $x = string[3] : ‘0.0’
$x = string[6] : ‘-1.305’
 ‘string’ false false true true true $x = string[6] : ‘-1.305’
$x = string[4] : ‘true’
 ‘string’ false false true true true $x = string[4] : ‘true’
$x = string[5] : ‘false’
 ‘string’ false false true true true $x = string[5] : ‘false’
$x = string[4] : ‘null’
 ‘string’ false false true true true $x = string[4] : ‘null’
$x = string[6] : ‘123str’
 ‘string’ false false true true true $x = string[6] : ‘123str’
$x = string[6] : ‘str123’
 ‘string’ false false true true true $x = string[6] : ‘str123’
$x = string[10] : ‘123, "str"’
 ‘string’ false false true true true $x = string[10] : ‘123, "str"’
$x = string[8] : ‘0xCC00F9’
 ‘string’ false false true true true $x = string[8] : ‘0xCC00F9’
$x = string[4] : ‘0123’
 ‘string’ false false true true true $x = string[4] : ‘0123’
$x = array()
 ‘array’ true false true false false $x = array()
$x = Array: (
    [1 (int)] => string[6] : ‘string’
)
 ‘array’ false false true true true $x = Array: (
    [1 (int)] => string[6] : ‘string’
)
$x = Array: (
    [0 (int)] => bool : ( = false )
    [1 (int)] => int : 1
    [2 (int)] => float : 1.3
    [3 (int)] => string[6] : ‘123str’
    [4 (int)] => string[6] : ‘str123’
    [5 (int)] => null : ( = NULL )
)
 ‘array’ false false true true true $x = Array: (
    [0 (int)] => bool : ( = false )
    [1 (int)] => int : 1
    [2 (int)] => float : 1.3
    [3 (int)] => string[6] : ‘123str’
    [4 (int)] => string[6] : ‘str123’
    [5 (int)] => null : ( = NULL )
)
$x = Object: (
    Class: stdClass (
    )
)
 ‘object’ false false true true true $x = Object: (
    Class: stdClass (
    )
)
$x = Object: (
    Class: TestObjectToString (
        property: test3 = string[11] : ‘some string’
        property: test1 = null : ( = NULL )
        property: test2 = bool : 1 ( = true )
        method: __toString
        method: print_it
    )
)
 ‘object’ false false true true true $x = Object: (
    Class: TestObjectToString (
        property: test3 = string[11] : ‘some string’
        property: test1 = null : ( = NULL )
        property: test2 = bool : 1 ( = true )
        method: __toString
        method: print_it
    )
)
$x = resource : Resource id #10 ( = RESOURCE )
 ‘resource’ false false true true true $x = resource : Resource id #10 ( = RESOURCE )
$x = Object: (
    Class: SplBool (
        property: __default = bool : ( = false )
        method: getConstList
        method: __construct
    )
)
 ‘object’ true false true false false $x = Object: (
    Class: SplBool (
        property: __default = bool : ( = false )
        method: getConstList
        method: __construct
    )
)
$x = Object: (
    Class: SplBool (
        property: __default = bool : 1 ( = true )
        method: getConstList
        method: __construct
    )
)
 ‘object’ false false true true true $x = Object: (
    Class: SplBool (
        property: __default = bool : 1 ( = true )
        method: getConstList
        method: __construct
    )
)