Notice undefined variable php ошибка

Notice: Undefined Variable in PHP

This error means that within your code, there is a variable or constant which is not set. But you may be trying to use that variable.

The error can be avoided by using the isset() function.This function will check whether the variable is set or not.

Error Example:

Output:

STechies Notice: Undefined variable: age in \testsite.loc\varaible.php on line 4

In the above example, we are displaying value stored in the ‘name’ and ‘age’ variable, but we didn’t set the ‘age’ variable.

Here are two ways to deal with such notices.

Fix Notice: Undefined Variable by using isset() Function

This notice occurs when you use any variable in your PHP code, which is not set.

Solutions:

To fix this type of error, you can define the variable as global and use the isset() function to check if the variable is set or not.

Example:

 if(!isset($age)) < $age = 'Varaible age is not set'; >echo 'Name: ' . $name.'
'; echo 'Age: ' . $age; ?>

Set Index as blank

Ignore PHP Notice: Undefined variable

You can ignore this notice by disabling reporting of notice with option error_reporting.

1. Disable Display Notice in php.ini file

Open php.ini file in your favorite editor and search for text “error_reporting” the default value is E_ALL. You can change it to E_ALL & ~E_NOTICE.

By default:

Change it to:

error_reporting = E_ALL & ~E_NOTICE

Now your PHP compiler will show all errors except ‘Notice.’

2. Disable Display Notice in PHP Code

If you don’t have access to make changes in the php.ini file, In this case, you need to disable the notice by adding the following code on the top of your PHP page.

Now your PHP compiler will show all errors except ‘Notice.’

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Исправление ошибки «Notice: undefined variable» в PHP

Ошибка undefined variable появляется при попытке обратиться к не существующей (не объявленной ранее) переменной:

Если в настройках PHP включено отображение ошибок уровня E_NOTICE, то при запуске этого кода в браузер выведется ошибка:

Notice: Undefined variable: text in D:\Programs\OpenServer\domains\test.local\index.php on line 2

Как исправить ошибку

Нужно объявить переменную перед обращением к ней:

Нет уверенности, что переменная будет существовать? Можно указать значение по-умолчанию:

Есть ещё один вариант исправления этой ошибки — отключить отображение ошибок уровня E_NOTICE:

Не рекомендую этот вариант. Скрытие ошибок вместо их исправления — не совсем правильный подход.

Кроме этого, начиная с PHP 8 ошибка undefined variable перестанет относиться к E_NOTICEи так легко отключить её уже не удастся.

Если ошибка появилась при смене хостинга

Часто ошибка возникает при переезде с одного сервера на другой. Практически всегда причина связана с разными настройками отображения ошибок на серверах.

По-умолчанию PHP не отображает ошибки уровня E_Notice, но многие хостинг-провайдеры предпочитают настраивать более строгий контроль ошибок. Т.е. на старом сервере ошибки уже были, но игнорировались сервером, а новый сервер таких вольностей не допускает.

Остались вопросы? Добро пожаловать в комментарии. 🙂

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[Solved]: Notice: Undefined variable in PHP

This error, as it suggests, occurs when you try to use a variable that has not been defined in PHP.

Example 1

Notice: Undefined variable: name in /path/to/file/file.php on line 2.

Example 2

Notice: Undefined variable: num2 in /path/to/file/file.php on line 3.

In our above two examples, we have used a total of 4 variables which include $name , $num1 , $num2 , and $answer .

But out of all, only two ($name and $num2) have resulted in the «undefined variable» error. This is because we are trying to use them before defining them (ie. assigning values to them).

In example 1, we are trying to print/display the value of the variable $name, but we had not yet assigned any value to it.

In example 2, we are trying to add the value of $num1 to the value of $num2 and assign their sum to $answer. However, we have not set any value for $num2.

To check whether a variable has been set (ie. assigned a value), we use the in-built isset() PHP function.

Syntax

We pass the variable name as the only argument to the function, where it returns true if the variable has been set, or false if the variable has not been set.

Example

 else < $result = "The name has not been set"; >echo $result; //Output: The name is Raju Rastogi echo "
" //Example 2 if(isset($profession)) < $result = "My profession is $profession"; >else < $result = "The profession has not been set"; >echo $result; //Output: The profession has not been set ?> 

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How to Fix Notice: Undefined Variable in PHP

PHP is a powerful programming language used by many websites around the world. However, sometimes PHP may throw an error message saying “Notice: Undefined Variable” on your website. This can confuse your website visitors and spoil their user experience. In this article, we will look at what this error message means and how to fix this error message.

How to Fix Notice: Undefined Variable in PHP

When you get an error message “Notice: Undefined Variable” in PHP it means that you are trying to use a variable or constant that is not defined.

Here is an example of this error

In the above example, we have defined $dob variable but are calling $age variable which is not defined. So you will see the following error.

Notice: Undefined variable: age in \test.php on line 3

There are two ways to fix this error. Either you can resolve this error or ignore this error.

Fix Error using isset() function

You can use define your variables as global and use isset() function to test if the variable is set or not before calling it. Here is an example

 echo 'Age: ' . $age; ?> Output Variable age is not set

Fix Error by setting variable as blank or default value

Another way to fix this problem, is to set it as blank.

We can also ignore this notice instead of fixing it, though it is not advisable to do so. Here are a couple of ways to disable this error message from appearing.

Disable Display Notice in php.ini file

Open php.ini file in a text editor. Look for the following line

error_reporting = E_ALL & ~E_NOTICE

Restart Apache server to apply changes. Now PHP compiler will show all errors except ‘NOTICE’ type of errors.

Disable displaying Notice in PHP code

If you don’t have access to php.ini file, then just add the following line at the top of your php file to disable notice errors.

That’s it. In this article, we have learnt how to deal with “Undefined Variable” error in PHP. Using variables without defining their values causes this error, and can be easily avoided by using isset() function to check if they are set or not, before using them.

Источник

How to Fix Notice: Undefined Variable in PHP

PHP is a powerful programming language used by many websites around the world. However, sometimes PHP may throw an error message saying “Notice: Undefined Variable” on your website. This can confuse your website visitors and spoil their user experience. In this article, we will look at what this error message means and how to fix this error message.

How to Fix Notice: Undefined Variable in PHP

When you get an error message “Notice: Undefined Variable” in PHP it means that you are trying to use a variable or constant that is not defined.

Here is an example of this error

In the above example, we have defined $dob variable but are calling $age variable which is not defined. So you will see the following error.

Notice: Undefined variable: age in \test.php on line 3

There are two ways to fix this error. Either you can resolve this error or ignore this error.

Fix Error using isset() function

You can use define your variables as global and use isset() function to test if the variable is set or not before calling it. Here is an example

 echo 'Age: ' . $age; ?> Output Variable age is not set

Fix Error by setting variable as blank or default value

Another way to fix this problem, is to set it as blank.

We can also ignore this notice instead of fixing it, though it is not advisable to do so. Here are a couple of ways to disable this error message from appearing.

Disable Display Notice in php.ini file

Open php.ini file in a text editor. Look for the following line

error_reporting = E_ALL & ~E_NOTICE

Restart Apache server to apply changes. Now PHP compiler will show all errors except ‘NOTICE’ type of errors.

Disable displaying Notice in PHP code

If you don’t have access to php.ini file, then just add the following line at the top of your php file to disable notice errors.

That’s it. In this article, we have learnt how to deal with “Undefined Variable” error in PHP. Using variables without defining their values causes this error, and can be easily avoided by using isset() function to check if they are set or not, before using them.

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