What potential issues or errors can arise when implementing conditional checks in PHP?

One potential issue when implementing conditional checks in PHP is forgetting to use the correct comparison operator, leading to unexpected behavior in the code. To avoid this, always double-check the comparison operators being used in your conditional statements.

// Incorrect comparison operator
$number = 10;

if ($number = 5) {
    echo "Number is 5";
} else {
    echo "Number is not 5";
}
```

```php
// Correct comparison operator
$number = 10;

if ($number == 5) {
    echo "Number is 5";
} else {
    echo "Number is not 5";
}