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In PHP, true is a boolean value representing 'true' or 'valid'. It is often used in functions to indicate successful execution or correct results. This article will explain the meaning of true in PHP functions through several examples.
We first define a simple function checkNumber(), which accepts an integer as a parameter. If the parameter is greater than 10, it returns true, otherwise it returns false.
function checkNumber($num) {
if ($num > 10) {
return true;
} else {
return false;
}
}
Next, we test the checkNumber() function.
// Test
if (checkNumber(8)) {
echo "Number is greater than 10";
} else {
echo "Number is less than or equal to 10";
}
In this example, when we pass 8 as the parameter, the function returns false, so the output is “Number is less than or equal to 10.” If we pass 15, it returns true, and the output will be “Number is greater than 10.”
Another common use case is validating user login. In this example, the login() function accepts a username and password as parameters. It returns true if the credentials are correct, otherwise it returns false.
function login($username, $password) {
// Assume this is the logic to validate username and password
if ($username === 'admin' && $password === 'password') {
return true;
} else {
return false;
}
}
We can test the login function using the following code:
// Test
if (login('admin', 'password')) {
echo "Login successful";
} else {
echo "Login failed";
}
In this case, when we pass the correct username and password, the function returns true, indicating that the login is successful. If the credentials are wrong, it returns false, indicating that the login has failed.
In PHP functions, true typically represents successful execution, correct operations, or a valid result. Using true appropriately can improve the readability and maintainability of your code, helping developers better handle function return values. Understanding and effectively using true is crucial in PHP programming.
