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Are there any best practices or alternative methods to ensure that PHP arrays are fully defined without any gaps or undefined values?

When working with PHP arrays, it is important to ensure that they are fully defined without any gaps or undefined values to avoid potential errors in your code. One way to achieve this is by using the array_filter() function to remove any null or empty values from the array.

php 
// Example PHP code snippet to ensure that an array is fully defined without any undefined values
$array = [1, 2, null, 4, 5, '', 7, 8, null];

// Remove null and empty values from the array
$array = array_filter($array);

// Now the array will only contain defined values
print_r($array);

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