What best practices can be implemented to prevent undefined offset errors in PHP functions that write data into arrays?

To prevent undefined offset errors in PHP functions that write data into arrays, it is important to first check if the array key exists before trying to write data to it. This can be done using the isset() function to avoid accessing non-existent array keys. 

// Check if the array key exists before writing data
if(isset($array[$key])) {
    $array[$key] = $value;
} else {
    // Handle the case where the array key does not exist
    echo "Array key does not exist";
}

Keywords

PHP arrays undefined offset error handling data writing

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