Video: Dab tsi yog txoj hlua PHP?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
A txoj hlua yog ib phau ntawm cov cim. Txoj hlua yog ib hom ntaub ntawv txhawb nqa los ntawm PHP . Cov txoj hlua Cov kev hloov pauv tuaj yeem muaj cov cim alphanumeric. Koj tshaj tawm qhov sib txawv thiab muab txoj hlua cim rau nws.
Kuj kom paub yog, koj ua li cas los tsim ib txoj hlua hauv PHP?
A txoj hlua yog ib ntu ntawm cov tsiaj ntawv, lej, cov cim tshwj xeeb thiab cov lej lej lossis kev sib xyaw ua ke ntawm tag nrho. Txoj kev yooj yim tshaj rau tsim ib txoj hlua yog los enclose txoj hlua lus (i.e. txoj hlua cim) nyob rau hauv ib lo lus hais cim ('), zoo li no: $my_string = 'Hello World'; Koj tseem tuaj yeem siv ob lub ntsiab lus ( ).
Ib sab saum toj, dab tsi yog hom ntaub ntawv hauv PHP? Cov ntaub ntawv hom hauv PHP Cov nqi muab rau a PHP variable tej zaum yuav txawv hom ntaub ntawv suav nrog cov hlua yooj yim thiab cov lej hom mus rau complex hom ntaub ntawv zoo li arrays thiab khoom. PHP txhawb tag nrho yim primitive hom ntaub ntawv : Integer, Floating point tooj lossis Float, String, Booleans, Array, Object, resource and NULL.
Hais txog qhov no, yuav ua li cas xyuas txoj hlua yog tus nqi lossis tsis nyob hauv PHP?
Koj tuaj yeem siv lub PHP strpos() ua haujlwm rau kuaj seb a txoj hlua muaj ib lo lus tshwj xeeb los yog tsis yog . Lub strpos() muaj nuj nqi rov qab txoj hauj lwm ntawm thawj qhov tshwm sim ntawm ib tug substring hauv a txoj hlua . Yog hais tias lub substring yog tsis yog pom nws rov dag. Tseem nco ntsoov tias txoj hlua txoj haujlwm pib ntawm 0, thiab tsis yog 1.
<<< txhais li cas hauv PHP?
Cov PHP cov neeg ua haujlwm ua haujlwm yog siv nrog tus lej lej los sau tus nqi rau qhov sib txawv. Basic assignment operator nyob rau hauv PHP yog "=". Nws txhais tau hais tias sab laug operand tau teem rau tus nqi ntawm qhov kev qhia ntawm sab xis. Txoj hauj lwm. Ib yam li
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Lub syntax ntawm strcmp() muaj nuj nqi yog: Syntax: int strcmp (const char * str1, const char * str2); strcmp() muaj nuj nqi yog siv los sib piv ob txoj hlua ob txoj hlua str1 thiab str2. Yog tias ob txoj hlua zoo ib yam ces strcmp() rov 0, txwv tsis pub, nws rov qab tus nqi tsis yog xoom