Check whether property exists in object or class with PHP

The property_exists() or the isset() function can be used to check if the property exists in the class or object.

Syntax

Below is the syntax of property_exists() function−

property_exists( mixed $class , string $property )

Example

if (property_exists($object, 'a_property'))

Below is the syntax of isset() function−

isset( mixed $var [, mixed $... ] )

Example

if (isset($object->a_property))

The isset() will return false if the ‘a_property’ is null.

Example

Let us see an example −

<?php
   class Demo {
      public $one;
      private $two;
      static protected $VAL;
      static function VAL() {
         var_dump(property_exists('myClass', 'two'));
      }
   }
   var_dump(property_exists('Demo', 'one'));
   var_dump(property_exists(new Demo, 'one'));
?>

Output

This will produce the following output−

bool(true)
bool(true)