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"masih bingung soal isset"
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Sat Apr 11, 2009 17:40 |
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curaph
PHPuser
Joined: 11 Apr 2009
Posts: 36
Location: pamulang
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| Post subject: "masih bingung soal isset" |
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0m tolong dong jelasin fungsi dan cara gunain 'isset' dari kemarin saya coba pelajarin tapi masih belum paham juga hehehe....
tolong ya 0m..
thank.. 
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Sun Apr 12, 2009 05:43 |
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fasisi
PHPnewbie
Joined: 28 Mar 2009
Posts: 17
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halo,
isset adalah fungsi untuk memeriksa apakah suatu variabel sudah diberikan nilai atau di-set nilainya.
misalnya:
isset(POST[btnOK])
itu memeriksa apakah item btnOK dalam array POST sudah ada nilainya atau belum. kalau ada, isset mengembalikan true, kalau tidak ada, isset mengembalikan false.
semoga membantu.
fasisi
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fasisi
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Mon Apr 13, 2009 00:14 |
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.
Super Master PHP
Joined: 05 Apr 2008
Posts: 2225
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punya php manual kan?
kurang lengkap?
contoh juga ada di situ...
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Juliet: "What's in a name? That which we call a rose by any other name would smell as sweet."
Hamlet: "To be, or not to be: that is the question."
- William Shakespeare - |
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Mon Apr 13, 2009 05:04 |
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bayuputra
Jagoan PHP
Joined: 08 Nov 2008
Posts: 564
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nambahin ya om :
ni aku paste in dari PHP manual om :
isset
(PHP 4, PHP 5)
isset — Determine whether a variable is set
Description
bool isset ( mixed $var [, mixed $var [, $...]] )
Determine whether a variable is set.
If a variable has been unset with unset(), it will no longer be set. isset() will return FALSE if testing a variable that has been set to NULL. Also note that a NULL byte ("\0") is not equivalent to the PHP NULL constant.
jadi fungsi dari isset itu untuk mengecek apakah suatu variable sudah/pernah diberi nilai atau belum. jika sudah pernah maka mengembalikan nilai true, jika belum false
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Mon Apr 13, 2009 12:31 |
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curaph
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Joined: 11 Apr 2009
Posts: 36
Location: pamulang
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makasih y om... tapi kasih contoh dong...
sekalian penjelasannya... heheheh..
maklum masih baru!!
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Tue Apr 14, 2009 15:00 |
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.
Super Master PHP
Joined: 05 Apr 2008
Posts: 2225
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buka php manual dong... ada contoh nya di situ...
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#ccdbea
Juliet: "What's in a name? That which we call a rose by any other name would smell as sweet."
Hamlet: "To be, or not to be: that is the question."
- William Shakespeare - |
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Wed Apr 15, 2009 12:24 |
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curaph
PHPuser
Joined: 11 Apr 2009
Posts: 36
Location: pamulang
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oy mas makasih y...
Alhamdulillah skrg dah fahammmmmm hehehe...
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Thu Apr 16, 2009 02:33 |
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RoNz
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Joined: 13 Apr 2009
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Tambahin lg y mas, siapa tahu membantu. :D
| Code: | <?php $variabel = "abcd";
$hasil = isset($variabel); //Hasilnya true
$hasil = empty($variabel); //Hasilnya false; ?> |
Null bukan kosong, dan kosong bukan Null. Karena kosong adalah suatu nilai, sedangkan Null belum diberi nilai sama sekali.
isset() gunanya utk memeriksa apakah suatu variabel telah diberi nilai atau belum. Jika belum, berarti variabel tsb belum dideklarasikan atau NULL.
empty() gunanya utk memeriksa apakah suatu variabel telah diberi nilai namun kosong.
Begitulah kira2 perbedaannya mas. :D |
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Sat May 01, 2010 17:01 |
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labcom_marko
PHPuser
Joined: 01 Mar 2010
Posts: 32
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thanx jagoan php..
tapi tanpa isset kita bisa memeriksa suatu nilai tersebut ga?? |
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Sun May 23, 2010 04:51 |
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misbakhuddin0707
Anak Baru
Joined: 13 Mar 2010
Posts: 4
Location: jl.sidodadi 44 babadan ponorogo
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 jadi tahu ane bang.'! |
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Thu Jun 03, 2010 01:44 |
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musicanda
PHP Master
Joined: 02 Jun 2010
Posts: 263
Location: Rumahnya Angeline
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| labcom_marko wrote: | thanx jagoan php..
tapi tanpa isset kita bisa memeriksa suatu nilai tersebut ga?? |
boleh kk....
misalnya :
if (isset($_session['id'])) {
...
}
boleh di ganti dgn fungsi empty() untuk memeriksa suatu nilai...
jadinya skrip nya gan berikut :
if(!empty($_session['id'])) {
...
} |
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Fri Jul 30, 2010 10:34 |
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Alvin313
PHP Programmer
Joined: 14 Mar 2010
Posts: 85
Location: Jakarta
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oh empty itu kebalikan dari isset,baru tau
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Sat Mar 05, 2011 00:59 |
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denmasferiyanto
PHPnewbie
Joined: 03 Mar 2011
Posts: 11
Location: BaNewMust
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| RoNz wrote: | Tambahin lg y mas, siapa tahu membantu. :D
| Code: | <?php $variabel = "abcd";
$hasil = isset($variabel); //Hasilnya true
$hasil = empty($variabel); //Hasilnya false; ?> |
Null bukan kosong, dan kosong bukan Null. Karena kosong adalah suatu nilai, sedangkan Null belum diberi nilai sama sekali.
isset() gunanya utk memeriksa apakah suatu variabel telah diberi nilai atau belum. Jika belum, berarti variabel tsb belum dideklarasikan atau NULL.
empty() gunanya utk memeriksa apakah suatu variabel telah diberi nilai namun kosong.
Begitulah kira2 perbedaannya mas. :D |
kalo ada input (misal input name : USER) dalam sebuah form dibiarkan kosong terus disubmit., nanti nilai USER tersebut NULL atau EMPTY ??? |
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Sat Mar 05, 2011 03:52 |
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squidy
PHP Programmer
Joined: 11 Feb 2011
Posts: 154
Location: Purwokerto
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The following things are considered to be empty:
"" (an empty string)
0 (0 as an integer)
"0" (0 as a string)
NULL
FALSE
array() (an empty array)
var $var; (a variable declared, but without a value in a class) |
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Sun Mar 06, 2011 11:12 |
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ichang
PHP Programmer
Joined: 02 Mar 2011
Posts: 57
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| makasih master |
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