How can PHP 4 syntax, like using "var", be updated to PHP 5 standards for class properties?

In PHP 5, the use of "var" to declare class properties is deprecated and should be replaced with public, private, or protected visibility keywords. To update PHP 4 syntax to PHP 5 standards, simply replace "var" with the appropriate visibility keyword (public, private, or protected) for the class property. 

class MyClass {
    // PHP 4 syntax
    var $myProperty;

    // Updated PHP 5 syntax
    public $myProperty;
}

Keywords

PHP 4 PHP 5 syntax update class properties var

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