What are some best practices for handling undefined variables or indexes in PHP to avoid notices or errors?

When handling undefined variables or indexes in PHP to avoid notices or errors, it is recommended to use isset() or empty() functions to check if a variable or index is set before accessing it. This helps prevent PHP notices or errors from being displayed when trying to access undefined variables or indexes. 

// Check if a variable is set before accessing it
if(isset($variable)){
    // Access the variable safely
    echo $variable;
}

// Check if an index is set before accessing it in an array
$array = array("key" => "value");
if(isset($array['key'])){
    // Access the array index safely
    echo $array['key'];
}

Keywords

error handling isset empty error_reporting strict_types

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