What are the potential pitfalls of upgrading from PHP 5.x to PHP 7.1, as seen in the provided code snippet?

One potential pitfall of upgrading from PHP 5.x to PHP 7.1 is the deprecation of the `each()` function, which is used to iterate over arrays. In PHP 7.1, using `each()` will result in a warning, and it is recommended to use `foreach` loops instead to iterate over arrays. 

// Before PHP 7.1
while (list($key, $value) = each($array)) {
    // code here
}

// After PHP 7.1
foreach ($array as $key => $value) {
    // code here
}

Keywords

backward compatibility deprecated functions syntax errors performance improvements security vulnerabilities

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