PHP Australia Conference 2015

class_uses

(PHP 5 >= 5.4.0)

class_uses Return the traits used by the given class

Descrierea

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

This function returns an array with the names of the traits that the given class uses. This does however not include any traits used by a parent class.

Parametri

class

An object (class instance) or a string (class name).

autoload

Whether to allow this function to load the class automatically through the __autoload() magic method.

Valorile întoarse

An array on success, or FALSE on error.

Exemple

Example #1 class_uses() example

<?php

trait foo 
{ }
class 
bar {
  use 
foo;
}

print_r(class_uses(new bar));

print_r(class_uses('bar'));

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

// use __autoload to load the 'not_loaded' class
print_r(class_uses('not_loaded'true));

?>

Exemplul de mai sus va afișa ceva similar cu:

Array
(
    [foo] => foo
)

Array
(
    [foo] => foo
)

Array
(
    [trait_of_not_loaded] => trait_of_not_loaded
)

Vedeți de asemenea

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User Contributed Notes 3 notes

up
5
stealz at op dot pl
1 year 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
4
ulf
1 year 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
adam at adamhahn dot com
1 year 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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