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  1. <?php
  2.  
  3. class MyClass {
  4.     private $type = 0; // we will force this to be an int
  5.     private $string = ''; // we will force this to be a string
  6.     private $arr = array(); // we will force this to be an array
  7.     private $percent = 0; // we will force this to be a float in the range 0..100
  8.  
  9.     function __set($name, $value) {
  10.         switch ($name) {
  11.             case "type":
  12.                 $valid = is_integer($value);
  13.                 break;
  14.             case "string":
  15.                 $valid = is_string($value);
  16.                 break;
  17.             case "arr":
  18.                 $valid = is_array($value);
  19.                 break;
  20.             case "percent":
  21.                 $valid = is_float($value) && $value >= 0 && $value <= 100;
  22.                 break;
  23.             default:
  24.                 $valid = true; // allow all other attempts to set values (or make this false to deny them)
  25.         }
  26.  
  27.         if ($valid) {
  28.             $this->{$name} = $value;
  29.  
  30.             // just for demonstration
  31.             echo "pass: Set \$this->$name = ";
  32.             var_dump($value);
  33.         } else {
  34.             // throw an error, raise an exception, or otherwise respond
  35.  
  36.             // just for demonstration
  37.             echo "FAIL: Cannot set \$this->$name = ";
  38.             var_dump($value);
  39.         }
  40.     }
  41. }
  42.  
  43. $myObject = new MyClass();
  44. $myObject->type = 1; // okay
  45. $myObject->type = "123"; // fail
  46. $myObject->string = 1; // fail
  47. $myObject->string = "123"; // okay
  48. $myObject->arr = 1; // fail
  49. $myObject->arr = "123"; // fail
  50. $myObject->arr = array("123"); // okay
  51. $myObject->percent = 25.6; // okay
  52. $myObject->percent = "123"; // fail
  53. $myObject->percent = array("123"); // fail
  54. $myObject->percent = 123456; // fail
Success #stdin #stdout 0.01s 20520KB
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Standard input is empty
stdout
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pass: Set $this->type = int(1)
FAIL: Cannot set $this->type = string(3) "123"
FAIL: Cannot set $this->string = int(1)
pass: Set $this->string = string(3) "123"
FAIL: Cannot set $this->arr = int(1)
FAIL: Cannot set $this->arr = string(3) "123"
pass: Set $this->arr = array(1) {
  [0]=>
  string(3) "123"
}
pass: Set $this->percent = float(25.6)
FAIL: Cannot set $this->percent = string(3) "123"
FAIL: Cannot set $this->percent = array(1) {
  [0]=>
  string(3) "123"
}
FAIL: Cannot set $this->percent = int(123456)
https://ideone.com/PWLwHm
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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