firebase onauthstatechanged subscription check code example

Example 1: firebase auth get current user

var user = firebase.auth().currentUser;var name, email, photoUrl, uid, emailVerified;if (user != null) {  name = user.displayName;  email = user.email;  photoUrl = user.photoURL;  emailVerified = user.emailVerified;  uid = user.uid;  // The user's ID, unique to the Firebase project. Do NOT use                   // this value to authenticate with your backend server, if                   // you have one. Use User.getToken() instead.}

Example 2: google auth.onstatechange

firebase.auth().onAuthStateChanged(function(user) {  if (user) { 
// User is signed in. 
} 
  else {   
    // No user is signed in.
  }});

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Php Example