Yintoni eyenza umsebenzi PHP microtime?

Ngo omnye ethandwa ulwimi PHP lokuprograma inika imisebenzi yethala sisityebi. Ngamnye kubo uneempawu zawo, kodwa ngenxa yenani elikhulu imisebenzi kunye nezihloko ezifanayo ababhekisi kukhokelela lihlazo. Imibuzo kubangela PHP umsebenzi microtime - wenza ntoni nendlela iyahluka ukusuka efanayo kuye?

umsebenzi microtime

I-PHP microtime ngenxa ubuyisela ixesha Unix kunye ngokuchana microseconds. Nangona imisebenzi embeddedness ngendlela ulwimi lokuprograma, oko asizuku sebenza kuzo zonke iindlela. Kwiinguqulelo zangaphambili iinkqubo zokusebenza, apho kungekho gettimeofday inkqubo umnxeba (), lo msebenzi uya kuvelisa iziphumo ezingachanekanga.

Yobeko microtime () iye impikiswano enye kuphela - oko imisela ukuba uhlobo lwe data aokusetyenziswa iziphumo ukubuya. Ukuba parentheses ehambelana yinyani (ukusuka IsiNgesi. "Liyinyaniso elokuba"), ngoko endaweni umsebenzi ubuyisela lwamanani umtya data. Xa kungekho nayiphi na parameter (oko kukuthi zero) kulindeleke ukuba lobuxoki (ukusuka IsiNgesi. "Wamanga"), ixesha ziya kubuyiselwa kwi fomathi msec umzuzwana. Apha, inani lokuqala liya ukugcina inani microseconds badlula ukususela ekuqaleni yesibini yangoku, kwaye eyesibini - ixesha lilonke eye sekudlule ukususela 1970, va kwimizuzwana.

Sebenzisa PHP microtime () kuyimfuneko apho kukho imfuneko ukufumana phandle kuthatha ixesha elide kangakanani na abulawe block khowudi. Amaninzi, le ndlela isetyenziswa ukwandisa ukusebenza kwale nkqubo.

Umahluko ne ixesha

Njengoko kunye nemisebenzi efanayo microtime, PHP abe lula - ixesha. Ngokwahlukileyo, "dade" yayo luchaneke kakhulu, isiphumo yokusebenzisa eli xesha umsebenzi () - inani lemizuzwana ukususela Unix eziqaphelekayo, oko kukuthi, ukususela ngoJanuwari 1, 1970, 00:00:00 GMT. Ngelixesha () kunokwenzeka ukuba afumane umahluko ixesha phakathi amanqaku amabini lwenkqubo, kodwa ngqo ngaphantsi.

Ukuba ufuna ukufumana indlela yexesha, kufuneka usebenzise umhla umsebenzi lo (). Ukuba kuyimfuneko, ukufumana umahluko ngendlela iphezulu, kungcono ukukhetha umsebenzi PHP - microtime.