How can using the "==" operator instead of "=" prevent errors in PHP code?

Using the "==" operator in PHP is used for comparison, while the "=" operator is used for assignment. By using "==" for comparison, you ensure that you are checking for equality between two values rather than accidentally assigning a value to a variable. This can prevent errors in your code that may arise from unintentional assignments when you meant to compare values. 

// Incorrect usage of "=" operator
$var1 = 10; // Assigning a value to $var1
$var2 = 5; 

if($var1 = $var2) { // Incorrectly using "=" instead of "=="
    echo "Values are equal";
} else {
    echo "Values are not equal";
}
```

```php
// Correct usage of "==" operator
$var1 = 10;
$var2 = 5;

if($var1 == $var2) { // Using "==" for comparison
    echo "Values are equal";
} else {
    echo "Values are not equal";
}

Keywords

"==" operator "=" errors PHP code

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