1.2.1399. Useless Method Alias¶

It is not possible to declare an alias of a method with the same name.

PHP reports that Trait method f has not been applied, because there are collisions with other trait methods on x, which is a way to say that the alias will be in conflict with the method name.

When the method is the only one bearing a name, and being imported, there is no need to alias it. When the method is imported in several traits, the keyword insteadof is available to solve the conflict.

This code lints but doesn’t execute.

<?php

trait T {
    function h() {}
    function f() {}
}

class X {
    use T {
        // This is possible
        T::f as g;

        // This is not possible, as the alias is in conflict with itself
        // alias are case insensitive
        T::f as F;
    }
}

?>

See also Conflict resolution.

1.2.1399.2. Connex PHP features¶

trait

1.2.1399.2.1. Suggestions¶

Remove the alias
Fix the alias or the origin method name
Switch to insteadof, and avoid as keyword

1.2.1399.2.2. Specs¶

Short name	Traits/UselessAlias
Rulesets	All, Analyze, CE, CI-checks, Changed Behavior, LintButWontExec
Exakat since	1.5.6
PHP Version	All
Severity	Major
Time To Fix	Instant (5 mins)
Precision	Very high
Note	This issue may lint but will not run
Available in	Entreprise Edition, Community Edition, Exakat Cloud