Most voted "undefined" questions

A variable is undefined if it has not been assigned a value. Use this tag for questions about the behavior of undefined variables or when you see undefined values where you don’t expect them.

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  Help me with the "Undefined index: referrer in " PHP error

  I’m making the following mistake: Notice: Undefined index: referrer in C: xampp htdocs brpg register_content.php on line 71 The archive register_content.php is: <link href="css/login-form.css"…

  php syntax-error undefined

  asked 7 years, 11 months ago Leo Ulhoa 1