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  1. PHP Call to undefined function
  2. How to Fix “Call to Undefined Function” in PHP?
  3. How Do Functions Work in PHP?
  4. What Are the Reasons and Solutions For The “Call to Undefined Function” Fatal Error in PHP?
  5. 1. Misspell of Function Name
  6. 2. Not Using This with Function Name Within PHP Class
  7. 3. Use Include or Require Properly
  8. 4. Using Dot(.) Instead of Object Operator(->)
  9. Conclusion
  10. Call to Undefined Function in PHP
  11. PHP Вызов функции undefined
  12. ОТВЕТЫ
  13. Ответ 1
  14. Ответ 2
  15. Как воспроизвести ошибку и как ее исправить:
  16. Ответ 3
  17. Ответ 4
  18. Ответ 5
  19. Ответ 6
  20. Ответ 7

PHP Call to undefined function

PREF_META_DESC; $pageMetaKeywords = $preferences->PREF_META_KEYWORDS; if(!isset($_POST['favourites'])) if(isset($_POST['DELETE_FAVOURITE']) and $_POST['DELETE_FAVOURITE'] == 1) < //delete favourites entry $rows = Delete_Favourite($_POST['ID_TO_DELETE']); >?>IN_DATA, ENT_QUOTES); ?>
$member->MB_ID); $favourites = Get_Favourites($fields); if(count($favourites) > 0)< echo "
"; echo "

"; echo "
"; //now scan down the favourites, read the product found and display it foreach($favourites as $f)< $id = $f->FV_ID; $p = getProductDetails($f->FV_PRODUCT); $imagePathProd = ""; if(strlen($p->PR_IMAGE_FOLDER) > 0)PR_IMAGE_FOLDER . "/";> $imagePathProd .= $p->PR_IMAGE; if(strlen($imagePathProd) == 0)< $imagePathProd = "/images/thumbnoimage.jpg"; >else < $imagePathProd = "/images/" . $imagePathProd; >//$tree = getProductTree($p->PR_PRODUCT); //$link = "/" . urlencode(html_entity_decode($p->PR_NAME, ENT_QUOTES)) . "/" . $tree . "/" . $p->PR_PRODUCT . ".htm"; //set link equal to the favourites table FV_URL (rather than generate it based on the product itself) since this represents the //actual link clicked on ie. the same product may sit in different categories. $link = $f->FV_URL; echo " \""PR_IMAGE_ALT . "\" height=\"100\" />". html_entity_decode($p->PR_NAME, ENT_QUOTES) . "
" . html_entity_decode($p->PR_DESC_SHORT, ENT_QUOTES) . " " . PHP_EOL; > echo " "; echo "
"; echo ""; echo "
"; echo ""; echo "
"; echo "

"; echo "
"; echo "
"; echo "
"; > ?>

However I am getting the error message: Fatal error: Call to undefined function get_favourites() in /home/download/domains/1ecommerce.com/public_html/dev/_cms/favourites.php on line 48 Any help would be really appreciated!

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How to Fix “Call to Undefined Function” in PHP?

How to Fix Call to Undefined Function in PHP

The majority of new web developers see the fatal error “Call to undefined function” in PHP code, and they are unsure of the cause. If you’re one of them, then continue reading this article to the end.

We encounter the uncaught error “ Call to undefined function ” when we define and call a user-defined function. There are numerous causes for this error, and in this post, we will explore them all and provide easy explanations to dispel all of your doubts.

However, before we go into the details of this article, you need first to comprehend what a function is and what we call it. So without further ado, let’s get started with the post.

Table of Contents

How Do Functions Work in PHP?

Similar to other programming languages, PHP has functions. A function is a separate code that processes additional input as a parameter before returning a value. In PHP, we have two types of functions Builtin functions and user-defined functions .

Builtin functions are the functions that PHP provides to us to use them. Actually, you seldom ever need to build your own function because there are already more than 1000 built-in library functions available for various purposes; all you need to do is call them as needed.

On the other hand, we can create our own functions, called user-defined functions . In the case of user-defined functions, there are two key aspects you need to understand:

Creating your own PHP function is pretty simple. Let’s say you want to create a PHP function that, when called, will display a brief message in your browser. The example below invokes the method printMessage() immediately after creating it.

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The name of a function should begin with the keyword “ function ,” and all PHP code should be enclosed in “ ” brackets, as seen in the example below:

     // Calling a PHP Function printMessage(); ?>

What Are the Reasons and Solutions For The “Call to Undefined Function” Fatal Error in PHP?

Following are the reasons for facing the “ Uncaught Error: Call to undefined function “:

  1. Misspell of function
  2. Not using this with the function name
  3. Use include or require properly
  4. Using dot (.) instead of object operator (->)

1. Misspell of Function Name

To prevent “ Call to undefined function “, always double-check the function name. Let’s look at a straightforward example to see what output the following code will return if the function name is misspelt:

 function myfunction()< $this->printMessage(); > > $myvar = new myclass(); $myvar->myfunctions(); ?>

In this example, we write myfunctions () in place of myfunction (), which causes this error, so it is always better to double-check the spelling of functions to avoid this error.

2. Not Using This with Function Name Within PHP Class

We face a “ call to an undefined function ” when we don’t use $this with the function or property name of the class. For example:

 function myfunction() < printMessage(); >> $myvar = new myclass(); $myvar->myfunction(); ?>

The $this keyword in PHP refers to the class’s current object. Using the object operator (->) , the $this keyword gives you access to the current object’s attributes and methods.

Only classes have access to the $this keyword. Beyond the class, it doesn’t exist. You’ll see an error if you try to use $this outside of a class.

You only use the $ with this keyword when you want to access an object property. The property name is not used with the dollar sign ($).

We now rewrite the code that causes the abovementioned errors with this keyword and examines the results:

 function myfunction()< $this->printMessage(); > > $myvar = new myclass(); $myvar->myfunction(); ?>

3. Use Include or Require Properly

When we create a namespace and include it in another file, we often face “ Call to undefined function “. For example:

include myfunction.php   echo tempNamespace\printMessage(); ?>

Code of myfunction.php

To avoid this error, we have to write include or require statements correctly and in the proper place. Now we write the above code again using the appropriate include statement.

Code of myfunction.php

Most of the time, when the user doesn’t check the file name, writes the wrong namespace name, or doesn’t include the namespace correctly, then faces “ Call to undefined function ” in PHP.

4. Using Dot(.) Instead of Object Operator(->)

The PHP code syntax is different from other programming languages. So when you come from JS or any other Object Oriented language, we use the dot( . ) operator to call a method on an instance or access an instance property. But in PHP, we access the members of the provided object using the object operator ( -> ). For example:

 function myfunction()< $this->printMessage(); > > $myvar = new myclass(); // Use . operator in place of object operator -> $myvar.myfunction(); ?>

We can easily get rid of this error by just replacing the dot (.) with the object operator (->) . For example:

 function myfunction()< $this->printMessage(); > > $myvar = new myclass(); // Use . operator in place of object operator -> $myvar->myfunction(); ?>

Conclusion

Finally, you arrive at a point after finishing this reading when you can quickly get rid of the “ Call to undefined function “. We covered all the causes in this article and gave you all the solutions. In this circumstance, we provide you with straightforward examples to help you resolve this uncaught issue.

To summarise the article on “ How to fix call to undefined function in PHP “, always first search for the PHP file containing the function definition. Next, confirm the file’s existence and check to see if the page had the necessary (or included ) line for the file, as mentioned above. Ensure the absolute path in the require / include is accurate as well.

Double-check that the spelling of the required statement’s filename is correct. Use this keyword in class to refer to the same class function. Always check the syntax of your code; many times, users from different languages use the wrong operators.

Share this article with your fellow coders if you found it beneficial, and let us know in the comments below ⬇️ which solution you used to solve the uncaught error “Call to undefined function”.

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Call to Undefined Function in PHP

Call to Undefined Function in PHP

Many of you have encountered this error several times Fatal error: Call to undefined function function_name() . In today’s post, we are finding out how to unravel this error. But before we solve this problem, let’s understand how PHP evaluates the functions.

There are several ways to define functions and call them. Let’s say you write it in the function.php file and call it in the main.php file.

 // function.php  php  namespace fooNamespace   function foo()   return "Calling foo"  >  > ?>  // main.php include function.php   echo fooNamespace\foo(); ?>
  1. Relative file name such as fooBar.txt . It will resolve to fooDirectory/fooBar.txt where fooDirectory is the directory currently busy directory.
  2. Relative path name such as subdirectory/fooBar.txt . It will resolve to fooDirectory/subdirectory/fooBar.txt .
  3. Absolute path name such as /main/fooBar.txt . It will resolve to /main/fooBar.txt .

    Unqualified name/Unprefixed class name:

$a = new fooSubnamespace\foo(); 
fooSubnamespace\foo::staticmethod(); 
\foonamespace\foo::staticmethod();

Now suppose you define a class & call the method of a class within the same namespace.

php  class foo   function barFn()   echo "Hello foo!"  >  function bar()   barFn();  // interpreter is confused which instance's function is called  $this->barFn();  >  >  $a = new foo();  $a->bar(); ?>

$this pseudo-variable has the methods and properties of the current object. Such a thing is beneficial because it allows you to access all the member variables and methods of the class. Inside the class, it is called $this->functionName() . Outside of the class, it is called $theclass->functionName() .

$this is a reference to a PHP object the interpreter created for you, which contains an array of variables. If you call $this inside a normal method in a normal class, $this returns the object to which this method belongs.

Источник

PHP Вызов функции undefined

Я пытаюсь вызвать функцию из другой функции. Я получаю сообщение об ошибке:

Fatal error: Call to undefined function getInitialInformation() in controller.php on line 24

файл controller.php:

require_once("model/model.php"); function intake() < $info = getInitialInformation($id); //line 24 >

модель /model.php

function getInitialInformation($id) < return $GLOBALS['em']->find('InitialInformation', $id); >

Вещи, которые уже пробовали:

Я не могу понять это. Я что-то пропустил?

ОТВЕТЫ

Ответ 1

Это была ошибка разработчика — неуместная конечная скобка, которая сделала указанную выше функцию вложенной функцией.

Я вижу много вопросов, связанных с ошибкой функции undefined в SO. Позвольте мне отметить это как ответ, если у кого-то другая проблема с функцией scope.

Сначала я попытался устранить неполадки:

Трудно было отслеживать фигурные скобки, поскольку функции были очень длинными — проблема с устаревшими системами. Дальнейшие действия по устранению неполадок были следующими:

Ответ 2

Как воспроизвести ошибку и как ее исправить:

 function pepper() < salt(); >> $y = new yoyo(); $y->pepper(); ?> 
PHP Fatal error: Call to undefined function salt() in /home/el/foo/p.php on line 6 
 function pepper()< $this->salt(); > > $y = new yoyo(); $y->pepper(); ?>

Если кто-то может опубликовать ссылку на почему $, это должно быть использовано до того, как PHP будет функционировать внутри классов, да, это было бы здорово.

Ответ 3

Много раз проблема возникает, потому что php не поддерживает короткие открытые теги в файле php.ini , i.e:

Ответ 4

Ваша функция, вероятно, находится в другом пространстве имен, чем тот, из которого вы его вызываете.

Ответ 5

Неуместная конечная скобка, которая сделала вышеприведенную функцию вложенной функцией.

Ответ 6

Я столкнулся с этой проблемой на виртуальном сервере, когда все правильно работало на другом хостинге. После нескольких модификаций я понял, что я include или require_one работает во всех вызовах, кроме как в файле. Проблема этого файла заключалась в коде < ?php ? >В начале и в конце текста. Это был script, который был только < ? , и в той версии запущенного apache не работало

Ответ 7

В настоящее время я работаю над веб-службами, где моя функция определена, и она выбрасывает ошибку undefined function.I только что добавила это в autoload.php в codeigniter

$autoload [‘helper’] = массив (‘common’, ‘security’, ‘url’);

common — это имя моего контроллера.

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