Calaamooyinka on PHP ah: xarig ah in tirada iyo qeybsanaan ah

Information mar walba waxa uu calaamad u. Kaliya marka waxaa jiray barnaamijyo ah, waxa qayb ka mid ah warqado, tirada iyo calaamooyin noqday (ee dareenka rasmiga ah).

Ilaa waqti cayiman The luqadda lagu hadlo ee ugu caansan, wuxuu ka dhigay calaamado u gaar ah, baaqyada iyo shuqullada tahay in si gaar ah. Waxaa muhiim ah in kuwan oo dhan kala duwanaansho of matalaad dabiiciga ah ee macluumaad ka yar in badan oo had iyo jeer lagu tilmaami karaa in loo dhigo, waa in la sameeyo heli processing software ah in mid ka mid dareen ah ama mid kale.

Strings iyo lambarada

Line - waa, dhammaan ayuu ka sarreeyaa, set oo ah characters kala duwan. In qalabka barnaamijyo kala duwan oo ka qayb jajab soocay oo dhan ka duwan. Qaar ka mid ah hal dhibic ka doorbiday comma kale (macnihiisu yahay "." In diinta line PHP ee tirada). Triad soocay hamso hal, comma ama boos. lambarada Real duubay by xarafka "E".

All kaluumaysiga iyo kuwan. Xisaabta iyo mabaadi'da hawlgalka processor kasta oo had iyo jeer la aqoonsan yahay tirada no-sharraxaad, iyo in la qiimaha dhabta ah ee u dhigma Processor dheeraad ah Waxaa la soo saaray shaqeeyaan.

Laakiin dunida ka mid ah doorsoomayaasha of nooc gaar ah (barnaamijyada xilligii) iyo xaqiijinta fikrad casriga ah ee loo dhanyahay ka mid ah nooc kasta oo xog ka dhigan tahay in PHP si loogu badalo string ah oo wuxuu galay tiro in weli waxba ma samayn. Ugu fiican ee PHP «gooyaa», ama halkii, si ay u sameeyaan 0 ama haddii string asalka ah waxaa ku jira ugu yaraan hal lambar. All tiro kor u characters horeysay ee aan tiro kor u tiro this.

Total xukunka diinta

In PHP tirada line diinta, haddii barnaamijyada aanu lahayn haddii kale si toos ah u dhici dul codsiga. Haddii variable ku jira lambar oo hal dhibic oo kaliya, waxaa laga heli karaa tirada dhabta ah. Haddii tiro kala horreeyaan inuu ka hor tago comma ah, ka dibna wax kasta oo yimaadana waa ay ka hor, waxaa loo fasiri doonaa sidii tiro, dabcan, oo dhan.

Kasta oo qof oo aan tiro ee isku xigxiga lambar istaago geedi socodka, iyo natiijada diinta PHP "isku xigta in tirada" waa qiimaha keliya oo la sameeyay ka hor inta qof ugu horeysay ee aan lambar.

Xisaabta iyo qof processing

Waa maxay dhib badan, marka hore ama labaad, Kuwaas oo ah qaaciidooyinka jagooyinka in ha ku rakibin on bogga, matrices cajiib ah, garaafyo, rogaan kuwaas oo mararka qaar xitaa ma qorayaasha ka soo jeeda integrals, oo kala ah integrals iyo bolinoomiyaal in n-in qarnigan, si ay u dhihi karaa mid aad u fudud: Society shaki la'aan Wayneeya wuxuu guulaha xisaabta iyo xisaabyahannada, laakiin maamulidda ka muhiimsan yahay qof, mid aad u adag oo ku aaddan tahay xisaabta, sida bustaha ah, bixinta maanka weyddiiyey, ma waxay ka baxsan tirada sixir, jawi wanaagsan, waayo, hal-abuurka tegi karo.

Sida caadiga ah, string PHP in tirada diinta ah si toos ah, laakiin marnaba ma i dhaawaceysaa inaan iska baarto. Waxa fiican in mar walba gaar ah: PHP fahamsan yahay in hal ama variable kale - tiro in. Haddii ay jirto wax shaki ah, waa in aad sheeg nooca variable ah oo cad (INT) ama (birtiina) ka hor inta qiimaha oo arag sida PHP fahamsan nooca is_integer a variable () ama is_float ().

Isbeddellada barnaamijyada casriga ah

Fasiraadda classic dhibaatada at PHP ah "in tirada line" waa fikradaha ah barnaamijyo casri ah gudahood. Geedi socodka dambe waa badan kala duwanaansho kala duwan. Functions number_format (), printf (), sprintf () shaqeyn karaan yaabab, ma aha oo kaliya tiro hal, laakiin sidoo kale tirada group.

атематика и численные вычисления - это не наш конек. Beddelaya ee PHP "line in tirada" shows, halkii, in, iyo karaankeeda, laakiin m atematika iyo xisaab tiro - ma aha our dhibic xoog leh.

Qor shaqeynayaan hufan oo lagu kalsoonaan karo in fulisaa processing gaar ah oo tiro in PHP, dhibaato jirin, iyo natiijada noqon doonta wax ka xun natiijada luqad xisaabeed. PHP - waa, ugu horreeya oo dhan, server ah, processing macluumaadka luqad, oo ay ku jiraan nooca xisaabta.