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    class_uses

    (PHP 5 >= 5.4.0, PHP 7, PHP 8)

    class_uses — Devolver los "traits" usados por la clase dada

    Descripción

    class_uses(mixed $class, bool $autoload = true): array

    Esta función devuelve un array con los nombres de los "traits" que usa la class dada. Sin embargo, esto no incluye ningún "trait" usado por una clase padre.

    Parámetros

    class

    Un objeto (instancia de clase) o una cadena (nombre de clase).

    autoload

    Si permitir a esta función cargar la clase automáticamente a través del método mágico __autoload().

    Valores devueltos

    Un array en caso de éxito, o false en caso de error.

    Ejemplos

    Ejemplo #1 Ejemplo de class_uses()

    <?php

    trait foo { }
    class     bar {
    use     foo;
    }

    print_r(class_uses(new bar));

    print_r(class_uses('bar'));

    function     __autoload($nombre_clase) {
    require_once     $nombre_clase . '.php';
    }

    // use __autoload para cargar la clase 'no_cargada'
    print_r(class_uses('no_cargada', true));
    ?>

    El resultado del ejemplo sería algo similar a:

    Array
(
    [foo] => foo
)

Array
(
    [foo] => foo
)

Array
(
    [trait_of_not_loaded] => trait_of_not_loaded
)

    Ver también

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    User Contributed Notes 7 notes

    up
    33
    stealz at op dot pl
    12 years ago
    To get ALL traits including those used by parent classes and other traits, use this function:

    <?php
    function class_uses_deep($class, $autoload = true) {
            $traits = [];
        do {
                $traits = array_merge(class_uses($class, $autoload), $traits);
        } while(    $class = get_parent_class($class));
        foreach (    $traits as $trait => $same) {
                $traits = array_merge(class_uses($trait, $autoload), $traits);
        }
        return     array_unique($traits);
    }
    ?>
    up
    9
    Jos Macedo
    4 years ago
    Another alternative to get all parent traits is:

    <?php
    function getUsedTraits($classInstance) {
            $parentClasses = class_parents($classInstance);
            $traits = class_uses($classInstance);
       
        foreach (    $parentClasses as $parentClass) {
                $traits = array_merge($traits, class_uses($parentClass));
        }
       
        return     $traits;
    }
    ?>
    up
    2
    donatj at gmail dot com
    3 years ago
    The popular stealz solution doesn't handle traits that use other traits. A little bit of recursion can clean the entire thing up a bit and make it more robust.

    <?php

    public function class_uses_deep( string $class, bool $autoload = true ) : array {
            $traits = class_uses($class, $autoload);

        if(    $parent = get_parent_class($class)) {
                $traits = array_merge($traits, class_uses_deep($parent, $autoload));
        }

        foreach(     $traits as $trait ) {
                $traits = array_merge($traits, class_uses_deep($trait, $autoload));
        }

        return     $traits;
    }

    ?>
    up
    14
    ulf
    11 years ago
    A slighly modified version from Stealz that also checks all the "parent" traits used by the traits:

    <?php
    public static function class_uses_deep($class, $autoload = true)
        {
                $traits = [];

                // Get traits of all parent classes
                do {
                    $traits = array_merge(class_uses($class, $autoload), $traits);
            } while (    $class = get_parent_class($class));

                // Get traits of all parent traits
                $traitsToSearch = $traits;
            while (!empty(    $traitsToSearch)) {
                    $newTraits = class_uses(array_pop($traitsToSearch), $autoload);
                    $traits = array_merge($newTraits, $traits);
                    $traitsToSearch = array_merge($newTraits, $traitsToSearch);
            };

            foreach (    $traits as $trait => $same) {
                    $traits = array_merge(class_uses($trait, $autoload), $traits);
            }

            return     array_unique($traits);
        }
    ?>
    up
    3
    Daniel Klein
    6 years ago
    If the class does not exist, you will get a warning, even if $autoload == false; I.e., if the class is not found, setting $autoload to false is not sufficient to silence the warning.

    This is different from class_exists ($class_name, $autoload = true), which doesn't generate a warning in either case.
    up
    2
    Daniel Klein
    6 years ago
    I have improved on ulf's improvement of stealz' code. I'm pretty sure the last "foreach" adds nothing, so I've removed it, as well as adding a check for string class names (as opposed to objects) to prevent the warning if the class is not found:

    <?php
    function class_uses_deep($class, $autoload = true) {
          $traits = [];

          // Get all the traits of $class and its parent classes
          do {
            $class_name = is_object($class)? get_class($class): $class;
        if (    class_exists($class_name, $autoload)) {
              $traits = array_merge(class_uses($class, $autoload), $traits);
        }
      } while (    $class = get_parent_class($class));

          // Get traits of all parent traits
          $traits_to_search = $traits;
      while (!empty(    $traits_to_search)) {
            $new_traits = class_uses(array_pop($traits_to_search), $autoload);
            $traits = array_merge($new_traits, $traits);
            $traits_to_search = array_merge($new_traits, $traits_to_search);
      };

      return     array_unique($traits);
    }
    up
    -43
    adam at adamhahn dot com
    11 years ago
    FYI: It is not explicitly stated, but if you run this function against a class that does not use any traits it will return an empty array.

    <?php

    class iDontUseTraits {
    }

    class_uses('iDontUseTraits'); // Returns empty array

    ?>
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