What best practices should be followed when using comparison operators in PHP to avoid errors?

When using comparison operators in PHP, it is important to ensure that you are comparing the correct data types to avoid errors. One common mistake is comparing a string to an integer, which can lead to unexpected results. To avoid this issue, you can use type-safe comparison operators (=== and !==) to compare both the values and data types of variables. 

// Incorrect comparison using regular comparison operator
$var1 = '10';
$var2 = 10;

if($var1 == $var2) {
    echo 'Equal';
} else {
    echo 'Not equal';
}

// Correct comparison using type-safe comparison operator
$var1 = '10';
$var2 = 10;

if($var1 === $var2) {
    echo 'Equal';
} else {
    echo 'Not equal';
}

Keywords

comparison operators PHP errors type coercion strict comparison

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