What potential issue arises from using the assignment operator instead of the comparison operator in PHP code?

Using the assignment operator instead of the comparison operator in PHP code can lead to unintended consequences, as it will assign a value to a variable instead of comparing two values. This can result in unexpected behavior or bugs in the code. To solve this issue, make sure to use the correct comparison operator (== or ===) when comparing values.

// Incorrect usage of assignment operator
$variable = 10;

// Correct usage of comparison operator
if ($variable == 10) {
    echo "Variable is equal to 10";
}