How can logical operators like "elseif" or combining conditions with "and" be used effectively in PHP to streamline conditional statements?

Using logical operators like "elseif" or combining conditions with "and" can help streamline conditional statements in PHP by allowing you to handle multiple conditions in a more organized and efficient way. This can make your code more readable and easier to maintain, as you can group related conditions together and avoid nested if statements. 

$age = 25;
$gender = "male";

if ($age < 18) {
    echo "You are a minor.";
} elseif ($age >= 18 && $gender == "male") {
    echo "You are an adult male.";
} elseif ($age >= 18 && $gender == "female") {
    echo "You are an adult female.";
} else {
    echo "Invalid age or gender.";
}

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