What is the difference between using isset() and empty() in PHP to check for empty values in an array?

The main difference between using isset() and empty() in PHP to check for empty values in an array is that isset() checks if a variable is set and not null, while empty() checks if a variable is empty (i.e., null, false, 0, or an empty string). Therefore, using isset() will return true even if the value is empty, while empty() will return true only if the value is considered empty. Depending on the specific use case, you should choose the appropriate function to check for empty values in an array. 

// Using isset() to check for empty values in an array
$array = ['key1' => '', 'key2' => 'value2'];

if(isset($array['key1'])){
    echo "Key 'key1' is set and not empty";
} else {
    echo "Key 'key1' is not set or empty";
}

// Using empty() to check for empty values in an array
if(empty($array['key1'])){
    echo "Key 'key1' is empty";
} else {
    echo "Key 'key1' is not empty";
}

Keywords

isset empty PHP array values

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