Php notice undefined index type in

How to Solve PHP Notice: Undefined Index?

While working in PHP, you will come across two methods called $_POST and $_GET. These methods are used for obtaining values from the user through a form. When using them, you might encounter an error called “Notice: Undefined Index”.

This error means that within your code, there is a variable or constant that has no value assigned to it. But you may be trying to use the values obtained through the user form in your PHP code.

The error can be avoided by using the isset() function. This function will check whether the index variables are assigned a value or not, before using them.

Undefined Index PHP Error

An undefined index is a ‘notice’ such as the following:

“Notice: Undefined variable,”

“Notice: Undefined index” and “Notice: Undefined offset.”

As you can see above are all notices, here are two ways to deal with such notices.

1) Ignore such notices
2) Resolve such notices.

How to Ignore PHP Notice: Undefined Index

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

1. php.ini

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

Change it to:

error_reporting = E_ALL & ~E_NOTICE

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

2. 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.’

Solution or Fix for PHP Notice: Undefined Index

Cause of error:

This error occurs with $ _POST and $ _GET method when you use index or variables which have not set through $ _POST or $ _GET method, but you are already using their value in your PHP code.

Undefined index in PHP $_get

Example using $_GET

In the following example, we have used two variables ‘ names’ & ‘age,’ but we did set only the name variable through the $_GET method, that’s why it throws the notice.

http://yoursite.com/index.php?name=ram

Notice: Undefined index: age \index.php on line 5 

To solve such error, you can use the isset() function, which will check whether the index or variable is set or not, If not then don’t use it.

if(isset($_GET[index error name]))

Code with Error resolved using isset() function:

http://yoursite.com/index.php?name=ram

else < $name = "Name not set in GET Method"; >if(isset($_GET['age']))< $name = $_GET['age']; >else< $name = "
Age not set in GET Method"; > echo $name; echo $age; ?> 

ram Age not set in GET Method 

Set Index as blank

We can also set the index as blank index:

// example with $_POST method $name = isset($_POST['name']) ? $_POST['name'] : ''; $name = isset($_POST['age']) ? $_POST['age'] : ''; // example with $_GET method $name = isset($_GET['name']) ? $_GET['name'] : ''; $name = isset($_GET['age']) ? $_GET['age'] : ''; 

Notice: Undefined Variable

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

Notice: Undefined variable: age in D:\xampp\htdocs\testsite.loc\index.php on line 7 

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

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

Notice: Undefined Offset

This type of error occurs with arrays when we use the key of an array, which is not set.

In the following, given an example, we are displaying the value store in array key 1, but we did not set while declaring array “$colorarray.”

'Red',3=>'Green',4=>'Blue',5=>'Yellow'); // echo value of array at offset 1. echo $colorarray[1]; ?> 

Notice: Undefined offset: 1 in \index.php on line 5 

Check the value of offset array with function isset() & empty(), and use array_key_exists() function to check if key exist or not.

'Red',3=>'Green',4=>'Blue',5=>'Yellow'); // isset() function to check value at offset 1 of array if(isset($colorarray[1])) // empty() function to check value at offset 1 of array if(!empty($colorarray[1])) // array_key_exists() of check if key 1 is exist or not echo array_key_exists(1, $colorarray); ?> 

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What is an Undefined Index PHP Error? How to Fix It?

PHP is a widely used scripting language that is mainly used for web development purposes. It is a scripting language and finds application in automating tasks that would otherwise be impossible to implement with just human intervention. Being a server-side language, it primarily takes care of things at the server’s end. Launched in 1995 for public use, it has remained a popular choice among web developers since then.

Programming is a tricky business. It is pretty normal to stumble upon errors and warnings while making a program. The same happens a lot to PHP developers, like when they face an Undefined index in PHP. However, such errors are not hard to deal with with a little bit of knowledge and guidance.

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What Is an Undefined Index PHP Error?

Websites often use forms to collect data from visitors. PHP uses $GET and $POST methods for such data collection. This data is collected and saved in variables that are used by the website to work and serve the visitor further. Many a time, some fields are left blank by the user. But the website tries to refer to these fields for proceeding further. That means the PHP code tries to get the value of the field that no one has defined and thus does not exist. Quite expectedly, it does not work and raises a notice called Undefined Index in PHP.

Code:

Result:

You can fix it using the isset() function, which we will discuss further in the upcoming sections.

Undefined Index is a notice in PHP, and it is a choice of the developer to either ignore it or fix it.

How to Ignore PHP Notice: Undefined Index?

Undefined Index in PHP is a Notice generated by the language. The simplest way to ignore such a notice is to ask PHP to stop generating such notices. You can either add a small line of code at the top of the PHP page or edit the field error_reporting in the php.ini file.

1. Adding Code at the Top of the Page

A simple way to ask PHP to disable reporting of notices is to put a line of code at the beginning of the PHP page.

Code:

Or you can add the following code which stops all the error reporting,

2. Changes in php.ini

Php.ini is a configuration file and is essential for all the programs running on PHP. Open this file and find the field error_reporting. The easiest way is to use the ctrl + F shortcut key. By default, error reporting is set to E_ALL. That means all errors are reported. Change this to E_ALL & ~E_NOTICE. It means all errors except for the notices will now be reported.

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How to Fix the PHP Notice: Undefined Index?

We know the cause of the error. It occurs when we use $_GET and $_POST methods to get input, but we reference it even when it has not been set. The solution simply is to check if it has been set before referencing.

We can use the isset() function, which checks if the variable ‘is set’ or not before referencing to them. Isset() function returns True or False depending on it.

Undefined Index in PHP $_GET

When using the $_GET method, the following code might show the notice Undefined index in PHP:

Code:

As we have not set any of these variables, this code shows the Undefined Index notice.

Change it to the following code to fix this issue:

Code:

$name = » John — This is our default name»;

$age = «10 — This is our default age. Let’s leave the grade blank.»;

Result:

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We can use a single line of code like this instead.

Code:

$name = isset($_GET[‘name’]) ? $_GET[‘name’]: “John- This is our default name”;

This approach also achieves the intended goal.

Result:

Notice: Undefined Variable

PHP shows this notice when we try to use a variable even before defining it.

Code:

Result:

It can be solved either by declaring a variable global and then using isset() to see if it is set or not. It can be echoed only if it has been set. Alternatively, we can use isset(X) ? Y to set a default.

Code:

Result:

We can set it after the isset() check like this.

Code:

$name= isset($name) ? $name:»Default»;

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It shows Undefined Offset Notice in PHP when we are referring to a key in an array that has not been set for the array.

Code:

$nameArray = array(1=>’one’, 2=>’two’, 4=>’four’);

Result:

It might show an undefined array key warning for some. It means the same thing that you are trying to access an undefined array key.

It can be solved similarly like the last two cases by using isset(), arrayexists() or empty() function.

Code:

$nameArray = array(1=>’one’, 2=>’two’, 4=>’four’);

echo ‘
using array_key_exists
‘;

echo array_key_exists(3, $nameArray);

echo array_key_exists(2, $nameArray);

Result:

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Conclusion

In this article, we learned about the undefined index in PHP. However, it is just one of the many errors, warnings, and notices that a PHP developer has to deal with. If you are looking to make a career out of developing web applications and handling such errors, Simplilearn is offering a Post Graduate Program in Full stack Web Development, in partnership with Caltech CTME. Simplilearn is the world’s #1 online Bootcamp that has helped advance 2,000,000 careers through collaboration with World’s top-ranking universities.

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About the Author

Ravikiran A S

Ravikiran A S works with Simplilearn as a Research Analyst. He an enthusiastic geek always in the hunt to learn the latest technologies. He is proficient with Java Programming Language, Big Data, and powerful Big Data Frameworks like Apache Hadoop and Apache Spark.

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Undefined Index: Post type [duplicate]

I’ve not made an custom edits to the code. Can anybody help? Here is the function associated with the error:

function responsive_slider_column_order($wp_query) < if( is_admin() ) < $post_type = $wp_query->query['post_type']; if( $post_type == 'slides' ) < $wp_query->set( 'orderby', 'menu_order' ); $wp_query->set( 'order', 'ASC' ); > > > 

1 Answer 1

This error comes from within a plugin.

In case you’re working on the plugin, to fix the issue you should first check for the existance of the $wp_query->query[‘post_type’] variable, like this:

if( isset($wp_query->query['post_type']) ) < $post_type = $wp_query->query['post_type']; if( $post_type == 'slides' ) < $wp_query->set( 'orderby', 'menu_order' ); $wp_query->set( 'order', 'ASC' ); > > 

In case you’re not working on the plugin, you might want to disable the errors for the plugins and simply enable them for the themes. To do that, you can add the following snippet of code to your wp-config.php, right below the WP_DEBUG constant definition:

function ignore_plugins_errors($errno, $errstr, $errfile, $errline, $errcontext) < if (defined('E_STRICT') && $errno==E_STRICT) < return; >$error_file = str_replace('\\', '/', $errfile); $content_dir = str_replace('\\', '/', WP_CONTENT_DIR . '/themes'); if (strpos($error_file, $content_dir) === false) < return true; >return false; > set_error_handler('ignore_plugins_errors'); 

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