What potential pitfalls should PHP developers be aware of when working with arrays and string manipulation functions like mail() in PHP?

One potential pitfall for PHP developers when working with arrays is not properly checking if an array key exists before accessing it. This can lead to "Undefined index" errors and unexpected behavior in the code. To avoid this issue, developers should always use isset() or array_key_exists() functions to check if a key exists before trying to access it. 

// Check if array key exists before accessing it
if(isset($array['key'])){
    // Access the array key
    $value = $array['key'];
    // Use the value
}

Keywords

arrays string manipulation functions mail() PHP developers potential pitfalls

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