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→‎Приведение типов
(Приведение типов)
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== Приведение типов ==
== Приведение типов ==
пример
{| class="wikitable"
|+ Примеры приведения типов
! $v = ...
! gettype($v)
! (bool)$v
! (int)$v
! (float)$v
! (string)$v
! (array)$v
! (object)$v
|-
! null
| string(4) "NULL"
 
| bool(false)
 
| int(0)
 
| float(0)
 
| string(0) ""
 
| []
| {}
|-
! true
| string(7) "boolean"
 
| bool(true)
 
| int(1)
 
| float(1)
 
| string(1) "1"
 
| [true]
| {"scalar":true}
|-
! false
| string(7) "boolean"
 
| bool(false)
 
| int(0)
 
| float(0)
 
| string(0) ""
 
| [false]
| {"scalar":false}
|-
! 0
| string(7) "integer"
 
| bool(false)
 
| int(0)
 
| float(0)
 
| string(1) "0"
 
| [0]
| {"scalar":0}
|-
! 1
| string(7) "integer"
 
| bool(true)
 
| int(1)
 
| float(1)
 
| string(1) "1"
 
| [1]
| {"scalar":1}
|-
! 1.0
| string(6) "double"
 
| bool(true)
 
| int(1)
 
| float(1)
 
| string(1) "1"
 
| [1]
| {"scalar":1}
|-
! M_PI
| string(6) "double"
 
| bool(true)
 
| int(3)
 
| float(3.141592653589793)
 
| string(15) "3.1415926535898"
 
| [3.141592653589793]
| {"scalar":3.141592653589793}
|-
! INF
| string(6) "double"
 
| bool(true)
 
| int(0)
 
| float(INF)
 
| string(3) "INF"
 
| array(1) {
  [0]=>
  float(INF)
}
 
| object(stdClass)#5 (1) {
  ["scalar"]=>
  float(INF)
}
 
|-
! NAN
| string(6) "double"
 
| bool(true)
 
| int(0)
 
| float(NAN)
 
| string(3) "NAN"
 
| array(1) {
  [0]=>
  float(NAN)
}
 
| object(stdClass)#5 (1) {
  ["scalar"]=>
  float(NAN)
}
 
|-
! ""
| string(6) "string"
 
| bool(false)
 
| int(0)
 
| float(0)
 
| string(0) ""
 
| [""]
| {"scalar":""}
|-
! "0"
| string(6) "string"
 
| bool(false)
 
| int(0)
 
| float(0)
 
| string(1) "0"
 
| ["0"]
| {"scalar":"0"}
|-
! "1"
| string(6) "string"
 
| bool(true)
 
| int(1)
 
| float(1)
 
| string(1) "1"
 
| ["1"]
| {"scalar":"1"}
|-
! "true"
| string(6) "string"
 
| bool(true)
 
| int(0)
 
| float(0)
 
| string(4) "true"
 
| ["true"]
| {"scalar":"true"}
|-
! "false"
| string(6) "string"
 
| bool(true)
 
| int(0)
 
| float(0)
 
| string(5) "false"
 
| ["false"]
| {"scalar":"false"}
|-
! "null"
| string(6) "string"
 
| bool(true)
 
| int(0)
 
| float(0)
 
| string(4) "null"
 
| ["null"]
| {"scalar":"null"}
|-
! []
| string(5) "array"
 
| bool(false)
 
| int(0)
 
| float(0)
 
|
Warning: Array to string conversion in /home/user/scripts/code.php on line 125
string(5) "Array"
 
| []
| {}
|-
! [0]
| string(5) "array"
 
| bool(true)
 
| int(1)
 
| float(1)
 
|
Warning: Array to string conversion in /home/user/scripts/code.php on line 125
string(5) "Array"
 
| [0]
| {"0":0}
|-
! ["abc"]
| string(5) "array"
 
| bool(true)
 
| int(1)
 
| float(1)
 
|
Warning: Array to string conversion in /home/user/scripts/code.php on line 125
string(5) "Array"
 
| ["abc"]
| {"0":"abc"}
|-
! ["a"=>"b"]
| string(5) "array"
 
| bool(true)
 
| int(1)
 
| float(1)
 
|
Warning: Array to string conversion in /home/user/scripts/code.php on line 125
string(5) "Array"
 
| {"a":"b"}
| {"a":"b"}
|-
! [["a"=>"b"]]
| string(5) "array"
 
| bool(true)
 
| int(1)
 
| float(1)
 
|
Warning: Array to string conversion in /home/user/scripts/code.php on line 125
string(5) "Array"
 
| [{"a":"b"}]
| {"0":{"a":"b"}}
|-
! new stdClass()
| string(6) "object"
 
| bool(true)
 
|
Warning: Object of class stdClass could not be converted to int in /home/user/scripts/code.php on line 125
int(1)
 
|
Warning: Object of class stdClass could not be converted to float in /home/user/scripts/code.php on line 125
float(1)
 
| Object of class stdClass could not be converted to string
| []
| {}
|-
! new class {function __toString(){ return "value"; }}
| string(6) "object"
 
| bool(true)
 
|
Warning: Object of class class@anonymous could not be converted to int in /home/user/scripts/code.php on line 125
int(1)
 
|
Warning: Object of class class@anonymous could not be converted to float in /home/user/scripts/code.php on line 125
float(1)
 
| string(5) "value"
 
| []
| {}
|-
! (function() { yield 1; yield 2; })()
| string(6) "object"
 
| bool(true)
 
|
Warning: Object of class Generator could not be converted to int in /home/user/scripts/code.php on line 125
int(1)
 
|
Warning: Object of class Generator could not be converted to float in /home/user/scripts/code.php on line 125
float(1)
 
| Object of class Generator could not be converted to string
| []
| {}
|-
! fopen('file', 'r')
| string(8) "resource"
 
| bool(true)
 
| int(6)
 
| float(6)
 
| string(14) "Resource id #6"
 
| array(1) {
  [0]=>
  resource(6) of type (stream)
}
 
| object(stdClass)#5 (1) {
  ["scalar"]=>
  resource(6) of type (stream)
}
 
|-
|colspan="25"| * ремарка
|-
|}


== Объявление типов для строгой типизации ==
== Объявление типов для строгой типизации ==
Источник — https://izi.wiki/ru/Служебная:Сравнение_версий/69