What is the difference between using OR and ||, as well as AND and && in PHP if statements, and when should each be used?

In PHP, the keywords OR and AND can be used interchangeably with the logical operators || and && in if statements. The main difference is that the precedence of the logical operators is higher than that of the keywords, so using the operators can help clarify the order of operations. It is generally recommended to use the logical operators || and && for better readability and to avoid potential confusion. 

// Using logical operators || and &&
if ($x > 5 && $y < 10) {
    // code block
}

// Using keywords AND and OR
if ($x > 5 AND $y < 10) {
    // code block
}

Keywords

PHP OR operator || operator AND operator && operator if statements

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