What is the meaning of true in PHP function?

In PHP, true is a Boolean value, which means true or established. In a function, true is usually used to indicate that the function executes successfully or returns the correct result. The following will explain the meaning of true in PHP functions through sample code.

First, we define a simple function checkNumber(), which accepts an integer as a parameter. If this parameter is greater than 10, it returns true, otherwise it returns false.

function checkNumber($num) {
    if($num > 10) {
        return true;
    } else {
        return false;
    }
}

// test
if(checkNumber(8)) {
    echo "The number is greater than 10";
} else {
    echo "The number is less than or equal to 10";
}

In this example, when we call the checkNumber() function and pass in the parameter 8, the function will return false, so the output number is less than Equal to 10. But if the parameter 15 is passed in, the function will return true, so the output number is greater than 10.

Another example is a more complex function, such as a login function login(), which receives a username and password and returns true after successful verification, Otherwise return false.

function login($username, $password) {
    // Assume here is the logic to verify username and password
    if($username === 'admin' && $password === 'password') {
        return true;
    } else {
        return false;
    }
}

// test
if(login('admin', 'password')) {
    echo "Login successful";
} else {
    echo "Login failed";
}

In this example, if we call the login() function and pass in the correct user name and password, the function will return true, indicating that the login is successful; otherwise Returns false, indicating login failure.

To sum up, true in a PHP function usually means that the function executes successfully, operates correctly or returns the correct result. When writing functions, reasonable use of true can help us better handle the return value of the function and improve the readability and maintainability of the code.

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