Ïîêà ìû ðàññìàòðèâàëè îñíîâû âçàèìîäåéñòâèÿ áàç äàííûõ ñ èñïîëüçîâàíèåì PHP, à òàêæå íåêîòîðûå æèçíåííî âàæíûå ìåòîäû, òàêèå, êàê ïðîâåðêà è îáðàáîòêà îøèáîê.Ìû òàêæå ñäåëàëè òàê ÷òî áû ìîæíî áûëî  äîáàâèòü èëè óäàëèòü ñîäåðæèìîå ïðîñòûì íàæàòèåì êíîïêè, áåç çíàíèÿ ïðîãðàììèðîâàíèÿ.Îäíàêî ìû íå äîëæíû ïîçâîëÿòü êîìó ëèáî ïîñòîðîííåìó âíîñèòü èçìåíåíèÿ â íàøè ñòàòüè è ñîäåðæèìîå.Íàäî ñäåëàòü òàê ÷òîáû íåêîòîðûå ÷àñòè íàøåãî ÷àéòà îñòàâàëèñü ïðèâàòíûìè è íåäîñòóïíûìè ïîñòîðîííèì.Ê ñîæàëåíèåþ íàéäóòñÿ ëþäè êîòîðûå çàõîòÿò ïîäïîðòèòü òî ÷òî ìû ñäåëàåì,ïîýòîìó íàäî áóäåò ñîçäàòü êëàññû êîòîðûå áóäóò îòâå÷àòü çà áåçîïàñíîñòü ïðèâàòíûõ ÷àñòåé.

ß äîëæåí ïîä÷åðêíóòü, ÷òî çäåñü ðàññìîòðåíû îñíîâû  áåçîïàñíîñòè, à ìåòîäû, íàïðèìåð, çàùèòû ñåðâåðîâ, áåçîïàñíîé ïåðåäà÷è äàííûõ è øèôðîâàíèÿ,íå îõâàòûâàþòñÿ íàñòîÿùåé ñòàòüåé.Îíè äîëæíû áûòü ïðèìåíåíû, åñëè âû ïëàíèðóåòå õðàíåíèÿ ëþáîé ñâåðõ âàæíîé èíôîðìàöèè.Äàâàéòå òåïåðü ðàññìàòðèâàòü òî, ÷òî ìû õîòèì, ÷òîáû íàøà ñèñòåìà ñìîãëà âûïîëíÿòü:Ñîõðàíåíèå èíôîðìàöèè î ïîëüçîâàòåëÿõ â áàçå äàííûõ.Ãðóïïèðîâàíèå ïîëüçîâàòåëåé íà êàòåãîðèè, íàïðèìåð, àäìèíèñòðàòîðû, ðåäàêòîðû è ñîòðóäíèêè, â öåëÿõ áåçîïàñíîñòè äîñòóïà.Ðàçðåøèòü ãðóïïàì ïîëüçîâàòåëåé äîñòóï ê êîíêðåòíûì îáëàñòÿì ñàéòà. ïåðâóþ î÷åðåäü íóæíî ÷òî áû áûëà çàùèùåíà îáëàñòü àäìèíèñòðèðîâàíèÿ, êîòîðóþ èñïîëüçóþòñÿ äëÿ äîáàâëåíèÿ è óäàëåíèÿ ñîäåðæèìîå íà ñàéòå.Äëÿ íà÷àëà, ìû ñîçäàäèì òàáëèöû áàçû äàííûõ äëÿ õðàíåíèÿ íàøåé èíôîðìàöèè î ïîëüçîâàòåëÿõ.

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Serendipity is a PHP-powered weblog application which gives the user an easy way to maintain an online diary, weblog or even a complete homepage. While the default package is designed for the casual blogger, Serendipity offers a flexible, expandable and easy-to-use framework with the power for professional applications.

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When Keats wrote "There is not a fiercer hell than the failure in a great object," he probably wasn't referring to the objects that make up the content management system we've been developing in this series. A testament to his forethought, if a component of our system fails then it won't be a good thing, which is why this month we'll be adding some rudementary code for validation and error handling. We'll then go on to creating the categorization system for articles stored on the system.

Validation

There are two main reasons for validating a user's input, the first being security. Let me give you a quick example of how things can go wrong.

Let's say I have a query that searches the database for a value provided by the user. The query code would look something like:

$thequery = 'SELECT * FROM products WHERE name = "'.$HTTP_POST_VARS['uservalue'].'"';
$connector->doQuery($thequery);

The query is compiled from a string (SELECT...), and the user's input ($HTTP_POST_VARS...), before being executed. If the user searches for "waffles," then the query executed will be:

SELECT * FROM products WHERE name = "waffles"

And all is well in the world. However, if your system is accessed by someone a little less pleasant (such as a 13-year-old hacker on school vacation), malicious code could be inserted in place of the word "waffles." The best way to protect your system against this type of attack (called query injection) is to check that all input from the user is in the format you expect. It's difficult, if not impossible, to be 100 percent safe, but we can do our best.

The second reason for validation is convenience and error handling. For instance, if you have a form asking for a telephone number, you don't want the user to be able to insert letters by mistake. Likewise, you may wish to check that dates have been entered correctly, or a ZIP/ postal code is valid.

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Èòàê î÷åðåäíîé õîñòèíãîâîé êîìïàíèåé î êîòîðîé ÿ õîòåë áû ïîãîâîðèòü ÿâëÿåòñÿ IfastNet. Ò.ê ìîé ïåðâûé ñàéò êîòîðûé ó ìåíÿ ïîÿâèëñÿ áûë èìåííî íà èõ ñåðâåðàõ ÿ è ðåøèë ïîäåëèòüñÿ âïå÷àòëåíèÿ î èñïîëüçîâàíèè.Ãîä íàçàä êîãäà ÿ òîëüêî óçíàë îá ýòîì õîñòèíãå,òî÷íåå íàø¸ë åãî ñðåäè ìèëëèîíîâ äðóãèõ, îí áûë åù¸ íå òàêèì íàâîðî÷åíûì êàê ñåé÷àñ.Íûí÷å æå ïàíåëü óïðàâëåíèÿ õîñòèíãîì ïðåäîñòàâëÿåò øèðîêèå âîçìîæíîñòè äëÿ ðàáîòû è óïðàâëåíèÿ ïðîñòðàíñòâîì.Ïîãîâîðèì î íåêîòîðûõ èõ íèõ.

Âî 1-õ ýòî âîçìîæíîñòü èñïîëüçîâàòü ñâîé äîìåí,ò.å ïðèêðóòèòü åãî è èñïîëüçîâàòü.Äàëåå ÷òî õîòåëîñü áû îòìåòèòü ýòî íåîãðàíè÷åííîå êîëè÷åñòâî email àäðåñîâ êîòîðîå âû ìîæåòå ñîçäàòü à ïîòîì èñïîëüçîâàòü êàê ñâîè íå ïðèáåãàÿ ê óñëóãàì áåñïëàòíûõ ñåðâåðîâ ïî÷òû.Ò.ê ÿ ëþáèòåëü íèêñîâûõ ñèñòåì ìíå êîíå÷íî æå ïîíðàâèëîñü òî ÷òî èõ ñåðâåð ðàáîòàåò íà ñèñòåìå Linux, íî ñðàçó æå ñòî áðîñàåòñÿ â ãëàçà ïîñëå ýòîãî, òàê ýòî íàçâàíèå ïàíåëè óïðàâëåíèÿ êîòîðàÿ óñòàíîâëåíà è êîòîðàÿ ïðåäîñòàâëÿåòñÿ âàì â ïîëüçîâàíèå - Vista Panel.Êîíå÷íî æå òàì îãîâîðåíî ÷òî ýòî íàçâàíèå íå èìååò íè÷åãî îáùåãî ñ ñèñòåìîé îêîí âèñòà, íî íàçâàíèå íåñîëüêî ñìóùàåò,õîòÿ ãëàâíîå íå âèä,ãëàâíîå ñîäåðæèìîå. 

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Vit

Î÷åíü ÷àñòî áûâàåò ÷òî ôîòîïë¸íêà, ôîòîáóìàãà, ôîòîàòåëüå, êàìåðà èëè ñêàííåð èìåþò êàêîé-òî ñäâèã öâåòîâ è áåëûå ïðåäìåòû âûãëÿäÿò íåìíîãî æ¸ëòîâàòûìè èëè ãîëóáîâàòûìè, ðåæå ñ êèðïè÷íûì, çåë¸íûì èëè ñèçîâàòûì îòòåíêîì. Ýòèì ãðåøàò ïî÷òè âñå äåø¸âûå ôîòîãðàôèè íà áóìàãå è ñíèìêè ñäåëàííûå öèôðîâîé êàìåðîé â ïëîõîîñâåù¸ííîì ìåñòå. Ïîïûòêà ïðîâåñòè öâåòîêîðåêöèþ äâèãàÿ Curves ìîæåò áûòü äîâîëüíî òðóäî¸ìêèì ïðîöåññîì. Åñòü äîâîëüíî ïðîñòîé è áûñòðûé ñïîñîá. Èä¸ì â Hue/Saturation (Ctrl-U), âûáèðàåì òîò öâåò êîòîðûé íàäî óäàëèòü è íåìíîãî óìåíüøàåì Saturation.

Êñòàòè îáû÷íî “çàâàë” öâåòà ïðàêòè÷åñêè îäèíàêîâ åñëè âñÿ ïë¸íêà îòñíÿòà â îäíèõ óñëîâèÿõ è ñäåëàíà â îäíîì àòåëüå. Ïîýòîìó èìååò ñìûñë ïîòðóäèòñÿ íàä îäíîé ôîòî è çàïèñàòü âñ¸ êàê Action, à ïîòîì ïðèìåíèòü íà îñòàëüíûõ òî æå ñàìîå, ðåçóëüòàò êîíå÷íî íå ãàðàíòèðóåòñÿ, íî âðåìÿ ìîæíî ñúêîíîìèòü èçðÿäíî.

Romtek

Åù¸ ïðîùå: ïðèìåíÿåì Image→Adjust→Autolevels (èëè ïðîñòî íàæàòèåì êîìáèíàöèè êëàâèø Shift-Ctrl-L) äëÿ Photoshop èëè Tools→Color tools→Levels→íàæàòü êíîïêó Auto - äëÿ GIMP.
 áîëüøèíñòâå ñëó÷àåâ ýôôåêò ïîëó÷àåòñÿ ïîòðÿñàþùèé, è ïðè òîì áåçî âñÿêîé “ìàãèè”. Öâåòà àâòîìàòè÷åñêè êîððåêòèðóþòñÿ.

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