What are some common reasons for cookies not being successfully read or displayed in PHP forms?

Common reasons for cookies not being successfully read or displayed in PHP forms include incorrect cookie settings, expired cookies, or not setting cookies before trying to read them. To solve this issue, make sure to set cookies before attempting to read them, ensure that the cookie name is correct, and check for any expiration dates on the cookies. 

// Set a cookie
setcookie("username", "JohnDoe", time() + 3600, "/");

// Read and display the cookie value
if(isset($_COOKIE['username'])) {
    echo "Welcome back, " . $_COOKIE['username'];
} else {
    echo "Cookie not set";
}

Keywords

cookies PHP forms reading displaying errors

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