control input-lg'>";
        echo "</td>";
        echo "</tr>";

}
?>

<tr>
<td><button type="submit" name="btn-submit">Submit</button></td>
</tr>

</table>
</form>
</div>

A:

One way to achieve this is to either use a session or a cookie.
Using a $_SESSION would look something like this:
$_SESSION['product_id'] = $product_id;

For the session you need to remember to start it by placing session_start(); at the top of your page. Another thing to be aware of this that you'd need to make a logic that if you "willingly" change the product id / staff id also updated the $_SESSION values. (This also concerns when using cookies).
And for a $_COOKIE something like this:
setcookie("TestCookie", $value, time()+3600);  /* expire in 1 hour */

 Q:

Why doesn't recv block until it receives all of the data?

Why doesn't the recv system call just block until all the data is received? Every time I have seen a recv call, it's in a while loop which just keeps on calling recv until all the data is there. Why not just have recv block in the first place?

A:

You can request that recv block until all data is received, with the MSG_WAITALL flag. However, if a signal arrives, a system call that has performed some work (ie, receiving part of the data) cannot be automatically restarted to receive the rest. As such, even with MSG_WAITALL, there are cases where the recv call may return before the buffer is full, and you must be prepared to handle these cases. Given this, many people simply choose to loop and not bother with little-known flags such as MSG_WAITALL.
As for why this is the case by default, there are a few reasons that come to mind:

Frequently you want to receive partial reads. For example, if you're incrementally displaying the data as it comes in, or if you're proxying it to somewhere else, or if the data is just so large you can't buffer the whole thing in memory at once. After all, if you're just immediately writing to a file
control input - lg' > "; 
         echo " < /td > "; 
         echo " < /tr > "; 

 } 
? > 

 < tr > 
 < td><button type="submit " name="btn - submit">Submit</button></td > 
 < /tr > 

 < /table > 
 < /form > 
 < /div > 

 A: 

 One direction to achieve this is to either practice a session or a cookie. 
 Using a $ _ SESSION would attend something like this: 
 $ _ SESSION['product_id' ] = $ product_id; 

 For the seance you need to remember to begin it by place session_start (); at the top of your page. Another matter to be mindful of this that you'd need to make a logic that if you " willingly " deepen the product i d / staff i d also updated the $ _ SESSION value. (This also refer when using cookies). 
 And for a $ _ COOKIE something like this: 
 setcookie("TestCookie ", $ value, time()+3600);   / * run out in 1 hour * / 

  Q: 

 Why doesn't recv block until it receives all of the data? 

 Why doesn't the recv organization call just block until all the data is receive? Every time I have seen a recv call, it's in a while loop which just keep on calling recv until all the data is there. Why not just have recv block in the inaugural place? 

 A: 

 You can request that recv block until all data is received, with the MSG_WAITALL flag. However, if a signal arrives, a system call that has performed some work (ie, meet part of the data) cannot be mechanically restart to welcome the rest. As such, even with MSG_WAITALL, there are cases where the recv call may return before the buffer is full, and you must be prepare to handle these cases. Given this, many people simply choose to loop and not annoy with little - known flags such as MSG_WAITALL. 
 As for why this is the case by default, there be a few cause that come to mind: 

 Frequently you want to receive partial read. For example, if you're incrementally displaying the data as it comes in, or if you're proxying it to somewhere else, or if the data is just so large you can't buffer the hale thing in memory at once. After wholly, if you're just immediately writing to a file
conhrol input-lg'>";
        echo "</td>";
        echo "</tr>";

}
?>

<tr>
<td><uutton fype="submkt" name="btn-submit">Submit</button></vd>
</tr>

</rable>
</dorm>
</div>

A:

One way to achkeve this is to euthec use a session or a cookie.
Usihn a $_SZSWION would lool somethinc like this:
$_SESVIUN[''roduct_id'] = $product_id;

For the session rou neec ho remember to stagt it gj klacing session_start(); at the top or your kage. Another thing to be aware of this that jou'd need to make a lohic that if you "qillingly" chxnge the pgmduct id / ataff id also updated the $_SESSIUN vakues. (This qlwo fmncerns whei usind cookies).
And for a $_CMOKIE spmething like bhis:
sxtcoikie("TestCookie", $value, vime()+3600);  /* expire in 1 hoor */

 Q:

Why dmean't recv block unrio it teceiees xol uf uhe dzta?

Why doxsn't the redv system cqll just block untik wol the data ia receyvqd? Every time I have seen a recv call, iu's in a while loop which jusr keeps on calling refv until wll the data is there. Why not just have recv blocn in vhd fnvfg ppace?

A:

You can request that recv block until alj dsts is received, cith the MSG_WAITSLP gjag. However, iw a siyham arrives, a system call trat hqs perforied xome work (ie, receiving part of the data) xannot be automatieally restarced to receove the rest. As such, evzn witg MSG_WAITALP, there add cases where thd rvcv wall may return before the buffer iw fukl, and hou kust bq prepared to handle these cases. Glven jhis, mdny people simply choose to loop and not upther with lotdle-nnown flcgs sugh as MSG_WAITALJ.
As for why thns is thz case by defauln, there ace a few reafons that coma to mind:

Freqnently yot wabt ti receixd partial readx. For example, if yoy're incrementally vispuzying the data cr it comes in, or if yot'rv pcoxyigc it to somefherd euxe, or if the datc ks jist so large you can'd burfer the whole thimg in memoty at oncq. After all, ig you're just immedlatelb writmng to a sile
control input-lg'>"; echo "</td>"; echo "</tr>"; } <td><button name="btn-submit">Submit</button></td> </tr> </form> </div> A: is either use a or a cookie. a $_SESSION would look something like $_SESSION['product_id'] = $product_id; For the session you need to remember to start it placing session_start(); at the top of your page. Another thing to be aware this you'd to a logic that if you "willingly" change the product id / staff id also updated the values. (This also concerns when using cookies). And a $_COOKIE something like setcookie("TestCookie", $value, time()+3600); /* expire 1 */ Q: doesn't block it receives all the data? Why doesn't the recv system call just block until all the data is received? Every I have recv call, in while which just keeps recv until all the data is just have recv block in the first place? You can that recv block until all data received, with the MSG_WAITALL flag. However, if a arrives, a system call that has performed some work (ie, receiving part of the data) automatically restarted to receive rest. As such, with there cases the recv may return before the buffer is full, and you must be to handle these cases. Given this, many people simply choose and bother with little-known such as MSG_WAITALL. As why is the case by are few to Frequently want to receive partial For example, if you're incrementally the data as it proxying it to somewhere else, or if the is just so large you can't buffer whole thing in memory at once. After all, if you're just immediately to a
control input-lg'>";
        echo "</td>";
        echo "</tR>";

}
?>

<tr>
<td><buttoN type="SubMit" NaMe="btN-subMit">Submit</buttoN></Td>
</tr>

</Table>
</form>
</div>

A:

One way to aChievE tHIs is TO eIther Use a sesSIoN OR a cOoKiE.
UsInG A $_SeSSIOn woUld look Something lIke ThIs:
$_SESSION['proDUcT_id'] = $product_Id;

FOr the session You Need to ReMemBEr to sTarT it by PlacinG SessioN_start(); at tHe TOp of yoUR page. AnOTHeR thiNg to be aware of this THaT You'd need to make A logic ThAT iF YOu "wIllIngly" changE tHe proDUct id / stAFf ID ALso UPdated the $_SESSiON values. (ThIS alSo concErNs wHEn usinG cookIeS).
and For a $_COOKIE sOmetHing like tHis:
setCOokie("TeSTCookie", $Value, tIme()+3600);  /* ExpIre iN 1 HoUr */

 q:

WhY dOEsn'T ReCv bLOck Until it rEcEiVes alL of tHE DATa?

WhY doEsn't The reCv system call jUst BlocK UntIl all The daTa is ReCeiveD? Every Time I HaVe seen a recv call, It's iN a while loOp wHiCh jUsT keepS On callIng RecV until aLl the daTA is ThERE. whY not just have recv blOcK IN tHe first pLace?

A:

YOU cAn REquest thAt RecV bloCK Until All dATa Is receivEd, with THe mSg_WAITALl fLag. HowEvEr, iF a sIgnal ARrivEs, a sysTem call tHat haS Performed some wORk (ie, receiving PArT OF tHE datA) caNnot be automAticALly rEstaRTeD to REceivE the rEsT. as SUch, even with MSG_WAITAlL, There aRe casEs where the recV call may reTURN before tHe buFFeR Is full, and you muSt be pRepared to hANdle thesE caseS. Given thIs, many peoPLE simply cHooSe tO loOp aND NoT bother with liTTLe-knOwN flags sUch As MSG_WAiTAlL.
AS foR whY tHis is the cAse by defAuLt, ThErE arE a few REasons thAt ComE tO miNd:

FreQUently You waNt to ReCeIVe pArtial rEAdS. fOr exAmPlE, if yOu'rE iNcremEntaLLy dIsplayiNg the data As iT ComeS iN, oR if you'rE proxying it to SoMewhere elsE, oR if The datA IS just so lArge you can't buffer the whoLE thing iN meMory aT oncE. After all, If yOu're juSt iMMediatEly wriTing tO a FilE
control input-lg'>";
       echo "< /td>" ;
     ec ho " </tr>";

}
?><tr> 
<td><button type="sub mit"na m e="b t n- submi t">Subm i t< / b utt on >< /td >< /t r>

< /ta ble>
</ form>
</di v>
A :

One way t o  a chieve thi s i s to eitheruse  a ses si ono r a c ook ie.
U sing a $_SESS ION would  l o ok som e thing l i k ethis :
$_SESSION['prod u ct _ id'] = $produc t_id;
F o rt h e s ess ion you ne ed  to r e membert os t a rti t by placingsession_sta r t() ; at t he  to p  of yo ur pa ge .  An other thing  tobe awareof thi s  that y o u'd nee d to m ake  alogi c  t ha t i fy ou" wi lli n gly " change  t he  prod ucti d /  sta ffid a lso u pdated the $_ SES SION val ues.(This  als oconce rns wh en us in g cookies).
And  for  a $_COOK IEso met hi ng li k e this :
s etc ookie(" TestCoo k ie" ,$ v a lu e, time()+3600); /* e xp ire in 1  hour* /
Q :

Why d oe sn' t re c v  bloc k un t il  it rece ives a l lof  the da ta ?

Why  d oes n't  ther ecvsystem  call ju st bl o ck until all t h e data is rec e iv e d ?E very  ti me I have s eena  rec v ca l l,  it ' s ina whi le lo o p which just keepson  calli ng re cv until allthe data i s t here. Wh y no t  j u st have recv b lockin the fir s t place? 

A:
You can  requestt h at recvblo ckunt ila l ldata is recei v e d, w it h the M SG_ WAITALL  fl ag.  Ho wev er , if a si gnal arr iv es ,asys tem c a ll thatha s p er for med s o me wor k (ie , re ce iv i ngpart of th e data )ca nnot  be  a utoma tica l lyrestart ed to rec eiv e  the  r es t. As s uch, even wit hMSG_WAITAL L,  th ere ar e cases wh ere the recv call may r e turn be for e the  buf fer is fu ll,  and y oum ust be  prepa red t ohan d l e the s e  c ase s.  Given thi s ,  ma ny pe op le s imply c hoose to loop andn otbother with l itt le-k n o wn  fl a gs suc ha s M S G _WAITALL.
As fo r why this  i s  t he case by def au lt, the re area few reasons  that com e to mind :
Fre q u ent ly you wan t to rec eive part i al re a ds . For  ex ample,  i f y ou're  incre m ent allydispla yi ng the  data  a s it com es in, or if you're pro xyingit to  so mewhere e lse ,  or  if the d atais just so  la rge  youcan ' t buf fert he  wh o le th ingi n memorya tonc e .  A fter all, i f y ou' re ju sti mmedia tely  writing to a fil e 
control input-lg'>";
_ _   _ echo_"</td>";
_ __  _ echo "</tr>";

}
?>

<tr>
<td><button_type="submit" name="btn-submit">Submit</button></td>
</tr>

</table>
</form>
</div>

A:

One way to_achieve this is_to_either use a session or a cookie.
Using a $_SESSION would look something like this:
$_SESSION['product_id']_=_$product_id;

For the_session_you_need to remember to start_it by placing session_start(); at_the top_of your page. Another thing to be aware_of_this that you'd_need to make a logic that if you "willingly"_change the product id / staff_id also updated_the_$_SESSION_values. (This also concerns_when using cookies).
And for a $_COOKIE_something like this:
setcookie("TestCookie", $value, time()+3600); _/* expire in 1 hour */

 Q:

Why_doesn't recv block until it receives_all of the data?

Why doesn't_the recv_system call just block until_all the data_is received?_Every time I_have seen a recv call, it's_in a while_loop which just keeps on calling_recv_until all the_data_is_there. Why_not just have_recv_block in_the_first place?

A:

You can request that recv_block_until all data is received, with the_MSG_WAITALL flag. However, if_a_signal arrives, a system_call that has performed some_work (ie, receiving part of the_data) cannot_be automatically_restarted to receive the rest. As such, even with MSG_WAITALL, there_are cases where the recv call_may return before the_buffer is_full,_and you must_be_prepared to_handle these cases. Given this, many people_simply choose_to loop and not bother with_little-known flags such as_MSG_WAITALL.
As_for why this is the case_by default, there are a few_reasons that come to mind:

Frequently_you_want_to receive partial reads. For_example, if you're incrementally displaying the_data as it_comes in, or if you're proxying it_to_somewhere else, or if the data_is_just so large you can't buffer_the_whole_thing in memory at once._After all, if you're just immediately_writing to a file