How to Fix the \'Strict Standards: Non-static method should not be called statically\' PHP Error?

Resolving "Strict standards: Non-static method should not be called statically" Error in PHP

The error message "Strict standards: Non-static method should not be called statically" occurs when a non-static method is accessed using a static invocation. To address this error, we will modify the code to ensure that all methods are declared as static when intended to be called statically.

In the provided code, the methods in the Page class are not declared as static, but they are being called as static. To resolve this issue, we need to add the static keyword to the method declarations.

Modify Page.php

class Page{
    // ...
    public static function getInstanceByName($name=''){
        // ...
    }
    // ...
}

By making these methods static, they can be accessed using the class name, as seen in the index.php file:

// ...
if($page){ // load by name
    $r = Page::getInstanceByName($page);
    if($r && isset($r->id)) $id = $r->id;
}
// ...

Additional Notes

• Static methods and Singleton patterns can hinder unit testing.
• Constructors should primarily focus on setting the object to a valid state rather than performing extensive queries.
• Constructors cannot return values; they always return void.

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