What is the error message "Warning: Illegal string offset 'add' in ..." indicating?

The error message "Warning: Illegal string offset 'add' in ..." indicates that you are trying to access an array using a string key, but the key is not valid for the array. To solve this issue, you should first check if the key exists in the array before trying to access it to avoid this warning. You can use the `isset()` function to check if the key exists in the array before accessing it. 

// Check if the key 'add' exists in the $array before accessing it
if(isset($array['add'])) {
    // Access the value associated with the key 'add'
    $value = $array['add'];
    // Perform operations with $value
} else {
    // Key 'add' does not exist in the array
    // Handle this case accordingly
}

Keywords

PHP error message illegal string offset add warning

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