isset PHP isset GET something GET something

Question

I am looking to expand on my PHP knowledge  and I came across something I am not sure what it is or how to even search for it   I am looking at php net isset code  and I see isset   GET  something        GET  something         I understand normal isset operations  such as if isset   GET  something     If something is exists  then it is set and we will do something   but I don t understand the    repeating the get again  the   or the      Can someone help break this down for me or at least point me in the right direction

User · Answer

If you want an empty string default then a preferred way is one of these (depending on your need):

$str_value = strval($_GET['something']);
$trimmed_value = trim($_GET['something']);
$int_value = intval($_GET['somenumber']);

If the url parameter something doesn't exist in the url then $_GET['something'] will return null

strval($_GET['something']) -> strval(null) -> ""

and your variable $value is set to an empty string.

trim() might be prefered over strval() depending on code (e.g. a Name parameter might want to use it)
intval() if only numeric values are expected and the default is zero. intval(null) -> 0

Cases to consider:

...&something=value1&key2=value2 (typical)

...&key2=value2 (parameter missing from url $_GET will return null for it)

...&something=+++&key2=value (parameter is " ")

Why this is a preferred approach:

It fits neatly on one line and is clear what's going on.
It's readable than $value = isset($_GET['something']) ? $_GET['something'] : '';
Lower risk of copy/paste mistake or a typo: $value=isset($_GET['something'])?$_GET['somthing']:'';
It's compatible with older and newer php.

Update Strict mode may require something like this:

$str_value = strval(@$_GET['something']);
$trimmed_value = trim(@$_GET['something']);
$int_value = intval(@$_GET['somenumber']);

User · Answer

You have encountered the ternary operator   It s purpose is that of a basic if-else statement   The following pieces of code do the same thing   Ternary    something   isset   GET  something        GET  something      failed     If-else   if  isset   GET  something            something     GET  something      else        something    failed

User · Answer

In PHP 7 you can write it even shorter   age     GET  age      27   This means that the  age variable will be set to the age parameter if it is provided in the URL  or it will default to 27  See all new features of PHP 7

User · Answer

is called Ternary  conditional  operator   example

User · Answer

What you re looking at is called a Ternary Operator  and you can find the PHP implementation here   It s an if else statement   if  isset   GET  something       true        thing   isset   GET  something       else       thing

User · Answer

That s called a ternary operator and it s mainly used in place of an if-else statement   In the example you gave it can be used to retrieve a value from an array given isset returns true  isset   GET  something        GET  something          is equivalent to   if  isset   GET  something           GET  something      else             Of course it s not much use unless you assign it to something  and possibly even assign a default value for a user submitted value    username   isset   GET  username        GET  username      anonymous

User · Answer

It is called the ternary operator  It is shorthand for an if-else block  See here for an example http   www php net manual en language operators comparison php language operators comparison ternary

User · Answer

It s commonly referred to as  shorthand  or the Ternary Operator    test   isset   GET  something        GET  something           means  if isset   GET  something            test     GET  something      else        test           To break it down    test          assign variable isset         test          if test is true  do      equivalent to if           otherwise     equivalent to else    Or        test --v if isset            if test is true  do      equivalent to         test      assign variable   else      otherwise     equivalent to

[php] isset PHP isset($_GET['something']) ? $_GET['something'] : ''

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