website: http://5go.cc/ QR Code Generator: http://5go.cc/QRCodeGenerator "Jim Giner" 写入消息 news:D1.99.60454.91F55A45@xxxxxxxxxxxx... On 1/1/2015 3:28 AM, Sachin Raut wrote: > Happy New Year to all members of PHP group. > > I just want to know the difference between following 3 statements. Or are > they all does the same thing. > > 1. isset($a) > 2. !empty($a) > 3. $a!="" > > Thanks > Sachin > 1 - tells you if a var is defined 2 - tells you if the var is null or not yet defined. 3 - using this as an 'if' condition tells you whether a var is 'not equal' to null plz more note false, null, 0, and empty string, in this case the are same BTW - all of this can be found in the manual online. You should spend the time to read some of the introductory items.
