There is a certain amount of questions that are absolutely trivial in nature: How to format a date, how to concatenate a string, et cetera. Questions that could be solved by taking a look into the manual.

Random examples from the tags I frequent:

• php timestamp function needed
• https://stackoverflow.com/questions/6613890/how-to-add-string-to-the-beginning-of-a-string
• How can I edit a binary image in PHP?
• Does PHP have an inverse of the date() function (other than strtotime())?
• Is goto supported in PHP 5.2.8?
• https://stackoverflow.com/questions/5880301/variable-string
• PHP - make all caps?
• Adding a background image to a <div> element
• Is it possible to get UNIX time from such date 2011-02-27 02:04:46?
• Time string to timestamp
• How do I create a PHP page which can accept file uploads?

What those OPs need is a link to the right manual, which we should give them. But the question serves no purpose. They don't even have a use by being searchable, because any sane search query would lead to the actual manual as the first hit.

Jeff discusses the possibility of introducing a new close reason for this over at Scifi.stackexchange.com. According to Robert's suggestion there, it could go like this:

general reference: this question is too basic; the answer is indexed in any number of general internet reference sources designed specifically to find that type of information.

Please please implement this.

Add a field (like the "enter duplicate ID here" popup) for users to suggest the correct manual link:

The suggested links would then be shown in a block in the top section of the question, like duplicate links.

Also, the amount of reputation earnable from these trivial questions is appalling. I'm sure a great portion of most high-rep users' points (including mine) is from answering "what was that function for replacing a string again?" type questions. This dilutes the value of reputation as a measure of true expertise a great deal.

I would suggest that answers to questions that get closed as "general reference" are made community wiki retroactively, taking away any reputation earned.