1 | initial version |
The "undefined array key" error in the mailto function of PHP usually occurs when the index/key specified for an array element is not defined or does not exist. There are a few steps you can take to resolve this error:
Example:
If you have an array defined as follows:
$myArray = array('name' => 'John', 'age' => 30);
And you try to access an undefined array key like this:
$email = $myArray['email'];
You will get an "undefined array key" error. To resolve this, you can check if the key exists using the arraykeyexists() function like this:
if (arraykeyexists('email', $myArray)) { $email = $myArray['email']; } else { $email = 'n/a'; }
This will prevent the error and provide a default value ('n/a') in case the key is not defined.