What is the potential issue with the if statement in the code provided?

The potential issue with the if statement in the code provided is that it is using the assignment operator `=` instead of the comparison operator `==` or `===`. This will result in the variable `$x` being assigned the value of 10 every time the if statement is evaluated, regardless of the condition. To fix this issue, the comparison operator `==` or `===` should be used to compare the value of `$x` with 10.

// Potential issue: using assignment operator instead of comparison operator
$x = 5;
if ($x = 10) {
    echo "The value of x is 10";
} else {
    echo "The value of x is not 10";
}
```

```php
// Fix: using comparison operator to compare the value of $x with 10
$x = 5;
if ($x == 10) {
    echo "The value of x is 10";
} else {
    echo "The value of x is not 10";
}