Nā hōʻailona ma ka PHP: ke kaula i ka helu a me ka Hope versa

Information i na manawa a pau o ka hōʻailona. Wale i ka wa a ua he iaaiey, ia lilo kekahi hapa o nā palapala, helu, a me na hoailona (ma ka olelo ano).

Up i kekahi kekahi manawa ka loa kaulana olelo mai ai i 'ōlelo, i kona mau hōʻailona, lima kolohe' ana a me ka hana o no oe ma ka a pau. He mea nui i nā mea a pau o kēia likeʻole o ka hoohalike maoli o ka 'ike mai ka mea uuku i ka nui hiki mau ke hōʻike i ka olelo, i mea e e loaʻa i ka lako polokalamu aaioee i loko o kekahi mea pono ole i kekahi.

Oi a me ka nui

Line - mea, ma luna o nā mea a pau, he lākou o nā huapalapala. Ma kekahi iaaiey hana hookaawale fractional hapa mai ka pau okoa. Kekahi mau pahuhopu i wahi 'ē aʻe comma (ʻano "." I ka PHP laina huli ana i loko o ka helu). Triad hookaawale hookahi apostrophe, comma a me ka lewa. Real helu hoʻopaʻa ma ka palapala "E".

A pau i kēia mau formalities. Makemakika, a me nā loina o ka hana ana o kekahi unu lawelawe mau hoomaopopo i ka helu o ole-frills, a me ka hana ana me na loina maoli o ka like nā nā unu lawelawe i ua ulu.

Akā, i ke ao ana o na aiaiiuo o kekahi mauʻano (no ka mea au polokalamu) a me ke kō o kaʻiʻo nō o kēia manaʻo o ka manaʻo ma o nā ano o kaʻikepili o ia hoʻi, ma ka PHP, e hoohuli i ke kui i loko o ka helu ana nō hana i kekahi mea. Ka maikai PHP «oki», a aho, e e 0 ai ina ka palapala kaula he ma ka liʻiliʻi loa hoʻokahi huahelu. All helu mai ai i ka mea mua ole-laulā huapalapala e i keia helu.

Huina huli ana rula

I PHP laina helu huli ana, ina o ka programmer aʻole i ole ia i hoʻomaka ai 'akomi ma luna o ka hana. Inā ka ee iaaanu aey ÷ huahelu, a me ka wahi wale, ka mea hiki ke loaa maoli helu. Inā ke kaʻina nui, e hālāwai me ke comma, laila, na mea a pau e hele mai ma mua ia, e hoohalike ana e like me ka helu, o ka papa, i ka pau.

Kekahi ole-laulā ano i loko o ka huahelu kaʻina aɃe ke kaʻina hana, a me PHP huli ana? Acoeueoao "lalani ma ka helu" o ka mea wale cia mea i hana mua o ka mua-huahelu e hoʻonaʻauao ai külana.

Makemakika a me ka ano aaioee

He aha ka oi pilikia, mua lua paha, e like me na nā papakuhikuhi o nā kūlana hana i mai i pono ma kaʻaoʻao, kilakila matrices, pakuhi, unravel i kekahi manawa, hiki ole i na kākau loko mai integrals, differentials o integrals a me polynomials i loko o ka N-ia hanauna, i olelo nui wale: Society kanalua Hoʻohanohano i ka piʻi like o ka makemakika a me mathematicians, akā, no ka lawelaweʻana i nā meaʻoi aku kona nui ma mua o ano, oi eiiieaena, a poʻi makemakika, e like me ka duvet, hoomaopopo ana i ka ninau naau, ka mea hiki iaʻu ke hoʻohala i ka hana uhane helu, he maikaʻi nā papa hana no kaʻike hoʻokumu.

Nō kāu, he PHP kaula i loko o ka helu o hoohuliia koho, akā, ka mea, aole eha, e nānā ia mai. He aho no ka manawa e kekahi: PHP ka hoomaopopo i kekahi a me kekahi ee iaaanu aey - ia helu. Inā he mea kekahi kanalua, oe e hoakaka i ke 'ano o ka ee iaaanu aey kūlike loa (INT)' ole (lana) ma mua o ka waiwai a me ka ike pehea PHP ka hoomaopopo i ke 'ano o ka ee iaaanu aey is_integer () ole is_float ().

Kū i ke au o kēia iaaiey

Ke Classic ano o ka pilikia ma ke PHP "ma ka laina helu" o loko o ka manaÿo o kēia iaaiey. Ke aʻe kaʻina Ua nui hou aku nā Lolina. Oihana number_format (), printf (), sprintf () ke hana i na mea kupanaha, ma ka hookahi helu ole wale, akā, i pae helu.

атематика и численные вычисления - это не наш конек. Hoʻololi 'ana i ka PHP "laina ma ka helu o ka" E hoike mai, e aho, i, a me ka mea e hiki, akā, ka m atematika a me ka laulā i ka ho omaulia - ia mea,ʻaʻole mākou ikaika wahi.

E kakau iho i ka kohu kūpono a me ka ike loea functionality i mea lapaʻau he mau aaioee o ka nui loa i loko o PHP,ʻaʻohe pilikia, a me ka hopena, e ia i kekahi mea ino loa ma mua o ka hopena o ka makemakika 'ōlelo. PHP - mea, mua o nā mea a pau, ke kikowaena, ka 'ōlelo' ikepili aaioee, a me ka makemakika ano.