How can the var_dump() function be used to debug PHP code and identify value mismatches?

The var_dump() function in PHP can be used to display the type and value of a variable, making it a useful tool for debugging code and identifying value mismatches. By using var_dump() on variables that are not behaving as expected, developers can quickly see the actual values stored in those variables and compare them to the expected values. This can help pinpoint where the issue lies and make it easier to correct any discrepancies.

```php
// Example of using var_dump() to debug PHP code and identify value mismatches
$expected_value = 10;
$actual_value = 5;

var_dump($expected_value, $actual_value);
```

In this example, var_dump() will display the type and value of both $expected_value and $actual_value, allowing the developer to see that there is a value mismatch between the two variables. This can help in identifying the source of the issue and correcting it accordingly.