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php - Undefined variable: $_SESSION - Stack Overflow 2012年3月10日 - You need make sure to start the session at the top of every PHP file where you want to use the $_SESSION superglobal. Like this:
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javascript - How to determine if variable is 'undefined' or 'null ... 2010年4月15日 - Possible Duplicate: Detecting an undefined object property in ... You can do like this: if(typeof variable_here === 'undefined'){ // your code here. };.
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Determine if a variable is set and is not - PHP If a variable has been unset with unset(), it will no longer be set. isset() will return FALSE if testing a ..... Notice: Undefined variable: j in filename.php on line 26
