> Begin forwarded message: > > Subject: Re: exif_read_data($image, 0, true) > From: Peter West <lists@xxxxxxxxx> > Date: 1 February 2015 11:15:33 am AEST > To: Abdul Abdul <abdul.sw84@xxxxxxxxx> > > When you ask some questions in code, you need a true or false answer. > > For example, the common form ( in just about all languages) of the "if" statement. > if (some-condition) > do something > > The "if" statement is a question: Is some-condition true or false? > > Languages which allow you to ask these questions need some convention for supply a true or false answer, and those conventions differ. Frequently, one way of saying "false" is to return the value 0 to the one asking the question. > > This lets you ask questions in the form of some kind of arithmetic expression that results in either 0 or some other value. You can then do-something if the expression returns any value except 0. The manual will tell you exactly what php takes as true and false, and you can formulate your code questions accordingly. This allows you to write more compact code. > > When you provide a true or false (that is, a boolean) parameter to a function, the function will internally ask a question using that parameter, and modify its behaviour accordingly. > > Find a basic php tutorial. Someone on the list can probably point you to one. People run out of patience with those who have not taken the trouble to find out the basics for themselves. > > Peter West > > "Other seed fell among thorns, and the thorns grew up and choked it, and it yielded no grain." > >> On 1 Feb 2015, at 10:52 am, Abdul Abdul <abdul.sw84@xxxxxxxxx> wrote: >> >> On Sat, Jan 31, 2015 at 4:39 PM, Aziz Saleh <azizsaleh@xxxxxxxxx> wrote: >> >>> >>> Documentation is here: >>> http://php.net/manual/en/function.exif-read-data.php What exactly did you >>> not understand of it? >>> >>> If you are expecting someone to go through the entire paramter section and >>> explain it to you, give it some time and someone might eventually do. >>> >> >> Thanks for your reply. Sorry I'm totally new to this. The part I didn't >> understand is what "0" and "true" mean here? Since when I remove those >> parameters and keep $image, I don't get an output. > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
