Amatshwayo phezu PHP: string enombolweni kungokufanayo a nalokho

Imininingwane ngaso sonke isikhathi liwuphawu. Kuphela uma kwakukhona izinhlelo, kwaba yingxenye izinhlamvu, izinombolo kanye nezimpawu (ngomqondo esisemthethweni).

Kufika isikhathi esithile Ethandwa kakhulu lulwimi lolukhulunywako, wenza izimpawu sakhe, ukuthinta nezinto zobuciko ngokukhethekile. Kubalulekile ukuthi zonke lezi Ukwehlukana the ukumelwa yemvelo kolwazi kusukela komncane kuya ezinkulu Ungahlala achazwe amazwi, okungukuthi ukwenza etholakalayo processing isofthiwe ngomunye umqondo noma enye.

Strings nezinombolo

Line -, ngaphezu kwakho konke, iqoqo izinhlamvu ahlukahlukene. Ngo amathuluzi ezahlukene zokuhlela wamaqhuzu ingxenye ehlukanisiwe lonke ezahlukene. Ezinye iphuzu encomekayo ezinye ukhefana (izindlela "." Esikhathini ukuguqulwa PHP umugqa ngesibalo). Triad ahlukaniswe aphostrofi olulodwa, ukhefana noma isikhala. izinombolo Real esalotshwa incwadi "E".

Zonke lezi okusemthethweni. Mathematics kanye nezimiso nokuqhutshwa processor njalo waqaphela inani no-frills, futhi ukusebenza amagugu wangempela elihambisana izilimi ezengeziwe eziye zasungulwa.

Kodwa ezweni eziguquguqukayo kohlobo oluthile (ezinhlelo inkathi) futhi ukugcwaliseka nombono wanamuhla ukuvumelana kwazo zonke izinhlobo idatha kusho e PHP ukuguqula yezinhlamvu enombolweni ukuthi namanje lutho. The best PHP «usike», noma kunalokho, ukwenza 0 noma uma yezinhlamvu yokuqala iqukethe idijithi okungenani oyedwa. Zonke izinombolo kuze kufinyelele izinhlamvu zokuqala ze-non-ezinombolo ezakha le nombolo.

Ubude ukuguqulwa umthetho

Ngo PHP Inambalayini ukuguqulwa, uma uhlelo akanayo ngenye zenzeka ngokuzenzakalelayo phezu isicelo. Uma variable iqukethe kuphela amadijithi futhi ephuzwini, ingatholakala inombolo engokoqobo. Uma izinombolo ngokulandelana ukuhlangabezana ukhefana, bese konke kuza ngaphambi, uzobe esichazwa njengesono esiphambene inombolo, yebo, wonke.

Noma yimuphi Lwezinhlelo ze-non-ezinombolo ukulandelana idijithi eyeka inqubo, futhi PHP ukuguqulwa yi "irowu kunombolo 'siwukuphela ukubaluleka kwalokho kwamiswa phambi lokuqala idijithi non uhlamvu.

Mathematics kanye uhlamvu ukucutshungulwa

Kuyini nzima, lokuqala noma lesibili, ngisho amafomula izikhundla elingalingani ekhasini, matrices umxhwele, amagrafu, sicacise labo ngezinye izikhathi awukwazi ngisho abalobi ethathwe integrals, nomehluko of integrals futhi Polynomials ku n-yileso sizukulwane, ukusho kakhulu ukumane: Umphakathi Akungabazeki ihlonipha impumelelo wezibalo kanye zezibalo, kodwa ekuphatheni kubaluleke ngaphezu uhlamvu, eyinkimbinkimbi kakhulu ihlanganisa izibalo, njengomuntu duvet, ukuhlinzeka ingqondo enelukuluku, abakwazi ukuya ngale inombolo magic, indawo evumayo lokusungula.

Ngokuvamile, yezinhlamvu PHP kunombolo iguqulwe ngokuzenzakalelayo, kodwa alilokothi libuhlungu ukuba ukuhlole. Kungcono ukuba othile njalo: PHP uyaqonda ukuthi oyedwa noma omunye variable - ngaleyo nombolo. Uma kukhona ukungabaza, kufanele ucacise uhlobo kwenombolo ngokucacile (int) noma (entantayo) ngaphambi ukubaluleka futhi ubone ukuthi PHP uyaqonda uhlobo a is_integer variable () noma is_float ().

Amathrendi lwezinhlelo yesimanje

Incazelo zakudala yenkinga ngesikhathi PHP "e Inambalayini" luphakathi imiqondo lwezinhlelo yesimanje. Inqubo okuphambene kakhulu ezahlukeneyo wehlukile. Imisebenzi number_format (), printf (), sprintf () angenza izimanga, hhayi kuphela ngesikhathi inombolo eyodwa, kodwa futhi izinombolo iqembu.

атематика и численные вычисления - это не наш конек. Ukuguqula kuya PHP "umugqa kunombolo" imibukiso, kunalokho, ukuthi, futhi, kodwa m atematika futhi ukubala zezinombolo - akusiyo iphuzu lethu eqinile.

Bhala ukusebenza ehloniphekile nokunokwethenjelwa nokobana processing ethile izinombolo PHP, akunankinga, futhi umphumela uyoba kunokunye okubi kakhulu umphumela ulimi zezibalo. PHP - okungukuthi, okokuqala kunakho konke, iseva, ulwazi ulimi ukucutshungulwa, kuhlanganise nohlobo zezibalo.