How to correctly call static methods in mutable variables under PHP 5.6?

PHP 5.6 version of static method call syntax differences and solutions

In PHP development, calling static methods using mutable variables may experience version compatibility issues. For example, if a code that runs normally in PHP 7.0 and above may report an error in PHP 5.6. This article analyzes this problem and provides solutions.

Problem code:

 $worker->server::closeinvalidconnection($worker);

This code tries to call the static method closeinvalidconnection through the mutable variable $worker->server . But in PHP 5.6, this throws a syntax error:

 <code>parse error: syntax error, unexpected '::' (t_paamayim_nekudotayim) in ...</code>

This is because PHP 5.6 has limited support for this syntax, and does not allow static methods to be called directly after mutable variables ::

Solution:

There are two ways to solve this problem:

Method 1: Intermediate variable assignment

Assign the value of the mutable variable to a new variable, and then call the static method through the new variable:

 $workerserver = $worker->server;
$workerserver::closeinvalidconnection($worker);

This method circumvents the limitations of PHP 5.6.

Method 2: Call using object method

Even if closeinvalidconnection is a static method, it can be called through an object instance:

 $worker->server->closeInvalidConnection($worker);

This method works in PHP 5.6 to 8.x versions, with better compatibility. Although the method is static, access via object instances is still possible.

Which method to choose depends on the code structure and personal preferences. Method 2 is usually more concise and has better compatibility, so it is recommended to use it first.

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