Yuav ua li cas yog ib tug sorting arrays?

Feem ntau thaum daws tej kev pab raws qib yuav tsum tau ua lub sorting ntawm cov ntaub ntawv uas yog cia nyob rau hauv ib tug array. Yuav ua li cas yog sorting arrays? Ntawm no, piv txwv li, ua si rau phaib, cov neeg muab lawv tej cards rau ntawm tus nqi thiab nplua. Qhov no ua rau nws tau los mus txiav txim yog dab tsi lwm yam phaib lawv tsis muaj. Thiab nyob rau hauv lub dictionaries tag nrho kom alphabetically. Piv txwv ntau. Tsi - rau rearrange tej xov tooj ntawm cov khoom nyob rau hauv tej kev txiav txim nyob rau thaj chaw teev. Sorting arrays yuav tsum tau haum feem ntau. Yuav kom qhov no kawg, txawv txoj kev yog siv. Yuav kom to taub txog lawv essence, nws suffices xav txog nyob rau hauv kom meej ib tug xov tooj ntawm txoj kev.

Nyob rau dab tsi lub hauv paus ua

Nws yog ib qho tseem ceeb kom nkag siab txog hais tias cov array muaj ntau officers ntawm lub lag luam thiab tej qhov tseem ceeb. Sorting arrays nyob rau hauv C yog ua li cas nrog rau cov kev pab los ntawm dozens ntawm cov kab ntawm code, thiab cov lus ntawm PHP, qhov no yog tiav tsuas yog ib qho yooj yim hais kom ua. Sorting arrays yog tau nyob rau hauv lub hauv paus ntawm lub lag luam los yog qhov tseem ceeb. Tseem nws yog tau mus faib cov nqi, tawm hauv lawv nrog uas twb muaj lawm tuav los yog muab tshiab.

Lub ntsiab sib txawv ntawm kev khiav dej num

Sorting ib array ntawm PHP yog tau siv ntau yam kev khiav dej num. Cia saib yuav ua li cas lawv txawv:

- Ib txhia zog yog txheeb arrays los ntawm tseem ceeb ntawd, thiab lwm leej lwm tus - nyob rau hauv qhov tseem ceeb.

- muaj ntau tsi txiav txim: descending, loj hlob, tej yam ntuj tso, numeric, alphabetic, random los yog teev cov neeg siv.

- Ib txhia zog yog muaj peev xwm cawm tom qab sorting kev twb kev txuas ntawm lub tseem ceeb thiab muaj nuj nqis. Tab sis muaj ib tug feature nyob rau hauv uas lub lag luam yuav tsum tau pib dua mus rau lub tshiab tus nqi.

- Txhua muaj nuj nqi muaj ib tug kev hloov kho ntawm lub dhau array. Tsi luam, lawv tsis rov qab mus.

- Lub tsi thiaj yog undefined, thaum cov nuj nqi txiav txim rau ob tug hais li muaj sib npaug. Qhov no tsis ruaj tsis khov sorting.

Ib txhia tsi muaj nuj nqi arrays nyob rau hauv PHP

Tsi () thiab rsort (). Tsi () kom lub array nyob rau hauv alphabetical thiaj. Cia peb nco ntsoov hais tias qhov no muaj nuj nqi yog cov ntaub ntawv sensitive. Nws yog txheeb los ntawm qhov tseem ceeb tsis suav cov yuam sij. Rsort () yuav txheeb nyob rau hauv rov qab txiav txim, ib yam nkaus thiab, raws li qhov tseem ceeb thiab tsis mloog tus tuav.

Asort () - nws yog ib tug ntawm lub zog ntawm khaws cia rau hauv lub kev sib raug zoo ntawm lub lag luam thiab qhov tseem ceeb. Nws tseem pab tau rau associative arrays, thaum nws yog ib qho tseem ceeb.

Nyob rau hauv cov piv txwv xaiv tseem ceeb cov npe ntawm cov txiv hmab txiv ntoo thiab qhov tseem ceeb - qhov no yog tus nqi. Qhov yog ascending nqi. Yog hais tias koj yuav tau tsi los ntawm cov npe ntawm txiv hmab txiv ntoo, koj yuav tsum ua ksort (), uas ua rau sorting los ntawm lub lag luam. Arsort () sorts lub ib-seem array nrog indexes (piav txog) nqis tseem ceeb. Krsort () nqis tsi tseem ceeb cov khoom.

Lub ob-dimensional array

Ib tug interesting two-dimensional array sorting. Qhov no yuav ua tau nyob rau hauv ntau txoj kev. PHP muaj lub sij hawm los sib piv ob tus xov tooj los yog ob tug cov hlua. Nyob rau hauv txhua multi-dimensional array, txhua lub caij ntawm ib array. Nyob rau hauv PHP, los sib piv cov ntau arrays, koj yuav tsum tau tsim ib lub txoj kev. Xav txog ib tug ob-dimensional array, uas khw muag khoom lub abbreviated lub npe ntawm txiv hmab txiv ntoo, tag nrho cov npe thiab tus nqi. Lub array ntsiab yuav txheeb nyob rau hauv alphabetical kev txiav txim ntawm lub abbreviated lub npe.

Nyob rau hauv qhov piv txwv nyob peb lub npe ntawm cov nuj nqi los sib piv (piv). Nws muaj 2 nqe lus - x, y. Cov nuj nqi yuav tsum noj ob qhov tseem ceeb, ces txiav txim qhov kev txiav txim. Cov tsis x, y - 2 array uas yog hauv lub ntsiab array y. Los sib piv qhov kev piav qhia-lub ntsiab ntawm lub arrays, uas dhau mus rau hauv cov kev ua, koj yuav tsum lub zog $ x [1], $ y [1]. Nyob rau hauv return1 kab yog ib tug rov qab tus nqi rau cov code uas hu ua cov kev ua. Nyob rau hauv peb array qhov raws li usort () muaj nuj nqi. Tsi mus raws li cov kev cai, uas qhia txog cov piv () muaj nuj nqi.

Tam sim no sorting arrays nyob rau hauv PHP yuav ua tau rau koj to taub.