In the context of PHP programming, what are some alternative approaches to handling undefined variables or offsets, and how can they improve code clarity and error handling?

When dealing with undefined variables or offsets in PHP, one common approach is to use the null coalescing operator (??) to provide a default value if the variable is not set. This helps prevent errors and improves code clarity by explicitly handling the case where a variable may be undefined. 

// Using the null coalescing operator to handle undefined variables
$variable = $array['key'] ?? 'default value';
echo $variable;

Keywords

error handling isset array_key_exists strict typing null coalescing operator

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