PHP Variable and Array Tests

PHP Variable Tests

php version 5.6.40

$v=	NULL	0	FALSE	""	TRUE	1	1.3	-1	"-1"	-1.7	"1"	"1.3"	"0"	" "	"string"	"123str"	"str123"	array()	array(1)	unset($v)
isset($v)	false	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	false
if ($v) {	false	false	false	false	true	true	true	true	true	true	true	true	false	true	true	true	true	false	true	false

empty($v)	true	true	true	true	false	false	false	false	false	false	false	false	true	false	false	false	false	true	false	true
$v == ''	true	true	true	true	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	true

is_scalar($v)	false	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	false	false	false
is_bool($v)	false	false	true	false	true	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false
is_string($v)	false	false	false	true	false	false	false	false	true	false	true	true	true	true	true	true	true	false	false	false
is_int($v)	false	true	false	false	false	true	false	true	false	false	false	false	false	false	false	false	false	false	false	false
is_numeric($v)	false	true	false	false	false	true	true	true	true	true	true	true	true	false	false	false	false	false	false	false
is_float($v)	false	false	false	false	false	false	true	false	false	true	false	false	false	false	false	false	false	false	false	false
is_null($v)	true	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	true
is_array($v)	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	true	true	false

ctype_digit($v)	false	false	false	false	false	false	false	false	false	false	true	false	true	false	false	false	false	false	false	false
ctype_alnum($v)	false	false	false	false	false	false	false	false	false	false	true	false	true	false	true	true	true	false	false	false
ctype_lower($v)	false	false	false	false	false	false	false	false	false	false	false	false	false	false	true	false	false	false	false	false
ctype_print($v)	false	false	false	false	false	false	false	false	true	false	true	true	true	true	true	true	true	false	false	false
ctype_space($v)	false	false	false	false	false	false	false	false	false	false	false	false	false	true	false	false	false	false	false	false
ctype_cntrl($v)	false	true	false	false	false	true	false	false	false	false	false	false	false	false	false	false	false	false	false	false
ctype_graph($v)	false	false	false	false	false	false	false	false	true	false	true	true	true	false	true	true	true	false	false	false

$v=	NULL	0	FALSE	""	TRUE	1	1.3	-1	"-1"	-1.7	"1"	"1.3"	"0"	" "	"string"	"123str"	"str123"	array()	array(1)	unset($v)
count($v)	0	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	0	1	0

gettype($v)	NULL	integer	boolean	string	boolean	integer	double	integer	string	double	string	string	string	string	string	string	string	array	array	NULL

intval($v)	0	0	0	0	1	1	1	-1	-1	-1	1	1	0	0	0	123	0	0	1	0
floatval($v)	0	0	0	0	1	1	1.3	-1	-1	-1.7	1	1.3	0	0	0	123	0	0	1	0
strlen($v)	0	1	0	0	1	1	3	2	2	4	1	3	1	1	6	6	6			0
strval($v)	''	'0'	''	''	'1'	'1'	'1.3'	'-1'	'-1'	'-1.7'	'1'	'1.3'	'0'	' '	'string'	'123str'	'str123'	'Array'	'Array'	''

floor($v)	0	0	0	0	1	1	1	-1	-1	-2	1	1	0	0	0	123	0	false	false	0
ceil($v)	0	0	0	0	1	1	2	-1	-1	-1	1	2	0	0	0	123	0	false	false	0
round($v)	0	0	0	0	1	1	1	-1	-1	-2	1	1	0	0	0	123	0	false	false	0
$v=	NULL	0	FALSE	""	TRUE	1	1.3	-1	"-1"	-1.7	"1"	"1.3"	"0"	" "	"string"	"123str"	"str123"	array()	array(1)	unset($v)
var_dump($v)	NULL	int(0)	bool(false)	string(0) ""	bool(true)	int(1)	float(1.3)	int(-1)	string(2) "-1"	float(-1.7)	string(1) "1"	string(3) "1.3"	string(1) "0"	string(1) " "	string(6) "string"	string(6) "123str"	string(6) "str123"	array(0) { }	array(1) { [0]=> int(1) }	NULL
var_export($v)	NULL	0	false	''	true	1	1.3	-1	'-1'	-1.7	'1'	'1.3'	'0'	' '	'string'	'123str'	'str123'	array ( )	array ( 0 => 1, )	NULL
print_r($v)	''	'0'	''	''	'1'	'1'	'1.3'	'-1'	'-1'	'-1.7'	'1'	'1.3'	'0'	' '	'string'	'123str'	'str123'	'Array ( ) '	'Array ( [0] => 1 ) '	''
serialize($v)	'N;'	'i:0;'	'b:0;'	's:0:"";'	'b:1;'	'i:1;'	'd:1.3;'	'i:-1;'	's:2:"-1";'	'd:-1.7;'	's:1:"1";'	's:3:"1.3";'	's:1:"0";'	's:1:" ";'	's:6:"string";'	's:6:"123str";'	's:6:"str123";'	'a:0:{}'	'a:1:{i:0;i:1;}'	'N;'

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Accessing Array Key/Values

$arr = array (
  'zero' => 0,
  'one' => 1,

  'three' => 'Three',
  'null' => NULL,
  'false' => false,
  'empty' => '',
);

$key =	'zero'	'one'	'two'	'three'	'null'	'false'	'empty'
isset($arr[$key])	true	true	false	true	false	true	true
array_key_exists($key,$arr)	true	true	false	true	true	true	true
if ($arr[$key]) {	false	true	false	true	false	false	false

empty($arr[$key])	true	false	true	false	true	true	true

gettype($arr[$key])	integer	integer	NULL	string	NULL	boolean	string

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