How can the order of function calls impact the outcome of PHP code execution?

The order of function calls can impact the outcome of PHP code execution when functions rely on certain variables or states that need to be set or calculated in a specific order. To solve this issue, ensure that functions are called in the correct sequence to avoid unexpected results or errors. 

// Incorrect order of function calls
$number = 5;
$result = addTwo($number); // This function expects $number to be set first

function addTwo($num) {
    return $num + 2;
}
```

To fix the issue, simply swap the order of function calls to ensure that the necessary variables are set before they are used:

```php
// Correct order of function calls
$number = 5;

function addTwo($num) {
    return $num + 2;
}

$result = addTwo($number);

Keywords

function calls PHP code execution outcome impact order

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