How can the order of code execution impact the outcome of variable checks in PHP scripts?

The order of code execution in PHP scripts can impact the outcome of variable checks when variables are not initialized or defined before they are used in conditional statements. To ensure that variable checks are accurate, always initialize or define variables before using them in any conditional checks.

// Incorrect order of code execution
if ($variable == 1) {
    $variable = 2;
}
$variable = 1;

// Correct order of code execution
$variable = 1;
if ($variable == 1) {
    $variable = 2;
}