Re: Determine whether $_GET has a value

This is a thorny topic for some people to grasp. The way I finally figured it out is that there are three answers to a yes and no question: yes, no and no answer. Or, to put it in boolean terms 1,0,NULL. It's that third option in a two option multiple choice question that throws things. What you may be looking for is the triple equals for comparison, which works by "typing" the value. For example: $testVar = NULL; $testVar == ''; is true $testVar === ''; is false $testVar = 0; $testVar == '0'; is true $testVar === '0'; is false $testVar == NULL; is true $testVar === NULL; is false Hope that helps a little. On Jun 23, 2004, at 11:13 PM, Terence wrote:

Hi, Say you have a querystring - index.php?myname=joe To determine whether myname has a value I have come to the following conclusions / shortcomings when using one of the following: ISSET = as long as the variable myname exists it's set, but there's no guarantee of a value !EMPTY = if your name = 0 (zero) then it's considered empty, for all else it seems to work STRLEN = I have found this to be the only sure way to know. Is there any other way, or should we always use a combination of ISSET and STRLEN? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- Brent Baisley Systems Architect Landover Associates, Inc. Search & Advisory Services for Advanced Technology Environments p: 212.759.6400/800.759.0577