He aha hanga PHP microtime mahi?

I roto i tetahi o te reo PHP papatono tino rongonui whakarato he mahi whare pukapuka taonga. He Ia o ratou ona ake āhuatanga, engari no te mea o te tau nui o ngā mahi, me ngā taitara rite i ngā maha arata'i ki te whakama. meinga Pātai PHP microtime mahi - he aha e te reira, a pehea faikehekehe reira i rite ki a ia?

mahi microtime

Ko te microtime PHP rite ki te hua hoki te wa Unix me ki tika ki microseconds. Ahakoa te ngā mahi embeddedness i roto i te reo hōtaka, e kore e taea te mahi i te reira i runga i ngā pūnaha katoa. I roto i te putanga mua o ngā pūnaha whakahaere, te wahi i reira he kore gettimeofday karanga pūnaha (), ka hua tenei mahi hua hē.

Wetereo microtime () e kotahi anake tohenga - whakatau reira he aha te momo o ngā raraunga taea te tutuki hua hoki. Ki te nga reu hāngai ki pono (i te reo Ingarihi. "True"), ka hei utu o te mahi hoki aho raraunga tau. I roto i te ngaro o tetahi tawhā (i te mea kore) Kei te whakaturia ki teka (i te reo Ingarihi. "Teka"), ka e hoki mai te wa i roto i te hōputu msec hēk. Here, te tau tuatahi ka pupuri i te maha o microseconds e kua haere mai te timatanga o te tuarua o nāianei, me te tuarua - faaite te wa katoa kua pahure e mai 1970, i roto i hēkona.

Whakamahia PHP microtime () he tika i roto i te kaupapa i reira ko te hiahia ki te kitea i roto i pehea te roa e te reira te mahia o te poraka waehere. Nuinga o ngā wā, e whakamahia ana i tēnei tikanga te ki te arotau i te mahi o te hōtaka.

Ko te rerekētanga ki te wā

Ka rite ki ki ngā mahi rite microtime, kua he noa PHP - wā. Rerekē ona tika atu, "tuahine", te hua o te whakamahi i te wā mahi () - te maha o hēkona mai te taitahi Unix, e ko, i Hānuere 1, 1970, 00:00:00 GMT. Ki te wā () he taea ki te whiwhi i te rerekētanga wā i waenganui i rua ngā o te hōtaka, engari ki iti pū.

Ki te hiahia koe ki te tiki i te wa pūnaha, kia koe te whakamahi i te rā mahi (). Ki te tika, ki te tiki i te rerekētanga pū mōrahi, he reira pai ki te whiriwhiri i te mahi PHP - microtime.