CATS ICONS 

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In this series we've been working through the construction of a Content Management System, for use with an Intranet or Web site. The foundation has been laid in the form of a PHP class for accessing the database ('DbConnector'), and to kick off this month we'll set up the database itself, and create the first working part of the system.

Creating the Database

The first table we're going to add to our database will store articles, for display on the Intranet. The ability to share information is the most important function of an Intranet, and the job of the Content Management System is to make doing this as easy as possible. Consider your own data requirements, a few important ones spring to mind for most articles tables:

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Ïðåæäå âñåãî, íàïîìíþ, ÷òî ðåãóëÿðíûå âûðàæåíèÿ ïðåäñòàâëÿþò ñîáîé îáû÷íûå òåêñòîâûå ñòðîêè, êîòîðûå èñïîëüçóþòñÿ êàê øàáëîíû äëÿ àíàëèçà òåêñòà. Ýòè ñòðîêè ñîñòàâëÿþòñÿ ïî ñïåöèàëüíûì ïðàâèëàì, ïîçâîëÿþùèì îïèñàòü ïðàêòè÷åñêè ëþáóþ ïîñëåäîâàòåëüíîñòü ñèìâîëîâ.

 ñîñòàâ PHP âõîäèò òðè íàáîðà ôóíêöèé äëÿ ðàáîòû ñ ðåãóëÿðíûìè âûðàæåíèÿìè. Ê ïåðâîìó íàáîðó îòíîñÿòñÿ ôóíêöèè, íàçâàíèÿ êîòîðûõ íà÷èíàþòñÿ ñ ereg. Ýòè ôóíêöèè ðàáîòàþò ñ ðåãóëÿðíûìè âûðàæåíèÿìè ñòàíäàðòà POSIX. Âòîðîé íàáîð ôóíêöèé, ïî ñóòè, ÿâëÿåòñÿ ðàñøèðåíèåì ïåðâîãî, è äîïóñêàåò èñïîëüçîâàíèå â ðåãóëÿðíûõ âûðàæåíèÿõ ìíîãîáàéòíûõ ñèìâîëîâ (Unicode). Ýòè ôóíêöèè íà÷èíàþòñÿ ñ mb_. Òðåòèé íàáîð ôóíêöèé (PCRE áèáëèîòåêà) ðàáîòàåò ñ PERL-ñîâìåñòèìûìè ðåãóëÿðíûìè âûðàæåíèÿìè. Íàçâàíèÿ ýòèõ ôóíêöèé íà÷èíàþòñÿ ñ ïðèñòàâêè preg. Ýòîò íàáîð ôóíêöèé îáåñïå÷èâàåò áîëüøóþ ôóíêöèîíàëüíîñòü è áûñòðîäåéñòâèå, ïîýòîìó ðàññêàçûâàòü ÿ áóäó èìåííî î íåì.

Íà ïðàâèëàõ ñîñòàâëåíèÿ ñàìèõ ðåãóëÿðíûõ âûðàæåíèé îñòàíàâëèâàòüñÿ íåò ñìûñëà. Äàæå èõ êðàòêîå îïèñàíèå çàéì¸ò íåñêîëüêî äåñÿòêîâ ñòðàíèö. Ïîýòîìó ïåðåéä¸ì ê ðàññìîòðåíèþ áèáëèîòåêè. Îíà âêëþ÷àåò ñåìü ôóíêöèé, êîòîðûå ïîçâîëÿþò âûïîëíÿòü ïîèñê, çàìåíó è ðàçáèâêó òåêñòà ñ ïîìîùüþ ðåãóëÿðíûõ âûðàæåíèé.
Äëÿ ïîèñêà â òåêñòå èñïîëüçóþòñÿ ôóíêöèè:

preg_grep()
preg_match_all()
preg_match()

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This article requires a basic knowledge of PHP programming, although a number of concepts are explained for those less experienced.

Our CMS will be stored in a number of folders, structured as follows:

cmsadmin	includes	templates	images
(The admin area of the Intranet)	(The PHP code that will be included in a number of different pages)	(Templates for pages on the Intranet)	(Pictures that will appear on the Intranet)

You may wish to create these four folders now. We're going to start by creating the PHP class which all others will "extend." This will be the root of the administration system, and anything we put in it (such as variables and functions) will trickle down to the other classes.

This root class will be called 'SystemComponent'. The code follows, and a full explanation is below:

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