PHP super class yog dab tsi?
PHP super class yog dab tsi?

Video: PHP super class yog dab tsi?

Video: PHP super class yog dab tsi?
Video: (LCAP) yog dab tsi? 2024, Kaum ib hlis
Anonim

PHP 5 Keeb kwm. Nyob rau hauv object oriented programming, Inheritance enables a chav kawm siv cov khoom thiab cov txheej txheem ntawm ib qho uas twb muaj lawm chav kawm . Cov chav kawm uas yog inherited yog hu ua Niam txiv chav kawm (los yog chav kawm super los yog chav kawm hauv paus ) thaum lub sij hawm chav kawm uas yog inheriting lwm yam chav kawm hu ua Child chav kawm (los yog sub chav kawm los yog muab tau chav kawm ).

Ntawm no, chav kawm hauv PHP yog dab tsi?

PHP | Cov chav kawm . Ib qho ntawm qhov sib txawv loj ntawm kev ua haujlwm thiab chav kawm yog a chav kawm muaj ob qho tib si cov ntaub ntawv (variables) thiab cov haujlwm uas tsim ib pob hu ua: 'khoom'. Chav kawm yog programmer-txhais cov ntaub ntawv hom, uas suav nrog cov txheej txheem hauv zos thiab cov hloov pauv hauv zos. Chav kawm yog ib phau ntawm tej khoom.

Ib yam li ntawd, $ qhov no yog dab tsi hauv PHP? $ no yog siv rau a PHP Yam khoom uas tau tsim los ntawm tus neeg txhais lus rau koj, uas muaj cov khoom sib txawv. Yog tias koj hu $ qhov no hauv ib txoj hauv kev hauv ib chav kawm ib txwm muaj, $ qhov no rov qab rau Cov Khoom (cov chav kawm) uas tus qauv ntawd yog. Nws yog ua tau rau $ qhov no yuav tsis tau txhais yog hais tias lub ntsiab lus teb tsis muaj niam txiv Object.

Xav txog qhov no, dab tsi yog chav kawm hauv PHP nrog piv txwv?

Chav kawm - Qhov no yog hom ntaub ntawv uas tus programmer txhais, uas suav nrog cov haujlwm hauv zos thiab cov ntaub ntawv hauv zos. Koj tuaj yeem xav txog ib chav kawm raws li tus qauv rau kev ua ntau zaus ntawm tib yam (los yog chav kawm ) ntawm object. Object - Ib qho piv txwv ntawm cov ntaub ntawv tsim los ntawm a chav kawm.

Dab tsi yog chav kawm abstract hauv PHP?

Abstract Classes hauv PHP . Cov chav kawm Abstract yog cov chav kawm nyob rau hauv uas tsawg kawg yog ib txoj kev abstract . Kev siv ntawm chav kawm paub daws teeb meem yog tag nrho cov hauv paus chav kawm siv qhov no chav kawm yuav tsum muab kev siv abstract txoj kev tshaj tawm hauv niam txiv chav kawm . Ib chav kawm abstract tuaj yeem muaj abstract zoo li tsis yog abstract txoj kev.

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