PHP property_exists() Function

The property_exists() function is an inbuilt function in PHP that is used to check objects and classes have properties or not.

Syntax:

bool property_exists(object|string $object_or_class, string $property);

Parameters: This function accept two parameters that are described below:

• $object_or_class: The name of the class or object to test for the property.
• $property_name: This name of the property in the class.

Return Value: This function returns true if the property exists, and false if property doesn’t exist, and null in case of getting an error.

Example 1: In this example, we will check whether the property is in class or not by using the PHP property_exists() function in PHP.

PHP

<?php
class My_Class_Property_Check {
    public $name;
    private $empid;
    protected $salary;

    static function check_prop() {
        var_dump(property_exists(
            'My_Class_Property_Check', 'empid'));
    }
}

// If the property exists it will be
// return true otherwise false
var_dump(property_exists(
    'My_Class_Property_Check', 'name'));
var_dump(property_exists(
    'MY_Class_Property_Check', 'salary'));
My_Class_Property_Check::check_prop();

?>

Output:

bool(true)
bool(true)
bool(true)

Example 2: In this example, we will check the property using the object of the class using PHP property_exists() method.

PHP

<?php
class My_Class_Property_Check {
    public $name;
    private $empid;
    protected $salary;

    static function check_prop() {
        var_dump(property_exists(
            new My_Class_Property_Check, 'empid'));
    }
}

    // If the property exists it will be
    // return true otherwise false
    var_dump(property_exists(
        new MY_Class_Property_Check, 'salary'));

    // This property does not exists
    // so it will return false
    var_dump(property_exists(
        new MY_Class_Property_Check, 'net_salary'));

    My_Class_Property_Check::check_prop();
?>

Output:

bool(true)
bool(false)
bool(true)

Reference: https://www.php.net/manual/en/function.property-exists.php