Okwenza PHP microtime umsebenzi?

Kwelinye ethandwa kakhulu ulimi PHP izinhlelo ihlinzeka ocebile umtapo imisebenzi. Ngamunye wabo has izici zayo siqu, kodwa ngenxa inani elikhulu imisebenzi namanye amatayitela anjalo ezivela konjiniyela ngokuvamile kuholela ukudideka. Imibuzo kubangele PHP microtime umsebenzi - ukuthi lenzani futhi ukuthi lihluke kanjani okufanayo kuye?

umsebenzi microtime

I microtime PHP ngenxa ibuyisela Unix isikhathi futhi lokhu akwenze ngokunemba ukuze microseconds. Naphezu imisebenzi embeddedness ngolimi izinhlelo, kungase kungasebenzi kuwo wonke amasistimu. Ezinguqulweni phambilini of yokusebenza izinhlelo, lapho kungekho gettimeofday uhlelo ucingo (), lo msebenzi uyoba nemiphumela ayilungile.

Syntax microtime () has agumenti eyodwa kuphela - ke ukuthi yini uhlobo idatha bungatholakala ukubuya imiphumela. Uma abakaki elihambisana kweqiniso (kusuka IsiZulu. "Yiqiniso"), khona-ke esikhundleni elibuyiswa umsebenzi zezinombolo idatha yezinhlamvu. In the ukungabikho iyiphi ipharamitha (okuyinto zero) isethelwe kumanga (kusuka IsiZulu. "Amanga"), isikhathi izobuyiselwa ngefomethi msec isekhondi. Lapha, inombolo yekucala izogcina inani microseconds esidlulile kusukela ekuqaleni yesibili zamanje, kanti eyesibili - isikhathi esiphelele eye sekudlule kusukela 1970, waveza ngemizuzwana.

Sebenzisa PHP microtime () kuyadingeka uma kwenzeka ukuthi kukhona isidingo ukuthola kanjani hushazela it fuza ekukhishweni block ikhodi. Ngokuvamile, leli washi isetshenziswa nokwandisa ukusebenza kohlelo.

Umahluko isikhathi

Njenganoma imisebenzi efana microtime, PHP has a elula - isikhathi. Ngokungafani esinembile, "dade" yalo, umphumela usebenzisa isikhathi umsebenzi () - isibalo imizuzwana kusukela Unix okuqinisekile, okungukuthi, kusukela ngo-January 1, 1970, 00:00:00 GMT. Ngokuhamba kwesikhathi () kungenzeka ukuthola umehluko isikhathi phakathi kwezindawo ezimbili zohlelo, kodwa ngobuciko kancane.

Uma ufuna ukuthola isikhathi ohlelweni, kufanele usebenzise usuku umsebenzi (). Uma kudingekile, ukuze uthole esiphezulu ukucacisa umehluko, kungcono ukuba ukhethe umsebenzi PHP - microtime.