Video: PHP khib nyiab sau ua haujlwm li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov khib nyiab yog tshwm sim thaum twg 10, 000 qhov ua tau cyclic khoom los yog arrays tam sim no nyob rau hauv lub cim xeeb, thiab ib tug ntawm lawv ntog tawm. Cov tus sau yog enabled los ntawm lub neej ntawd nyob rau hauv txhua qhov kev thov. Thiab qhov no yog, feem ntau yog qhov zoo.
Yog li ntawd, PHP puas muaj khib nyiab?
PHP muaj kev sib xyaw ntawm khib nyiab thiab kev suav suav. Cov tom kawg yog hom tseem ceeb ntawm kev tswj kev nco, nrog rau khib nyiab khaws cov khoom uas tus ref counter nco (circular references). Ua ntej 5.3, php ib nkaus xwb muaj ref-counting, thiab txawm nyob rau hauv 5.3 nws yog qhov tseem yuav ua li cas nco feem ntau yuav tso tawm.
Tsis tas li ntawd, Java garbage collection ua haujlwm li cas? Java khib nyiab yog tus txheej txheem uas Java cov kev pab cuam ua kev tswj kev nco tsis siv neeg. Java cov kev pab cuam compile rau bytecode uas tuaj yeem khiav ntawm a Java Virtual Machine, los yog JVM luv luv. Cov khib nyiab pom cov khoom tsis siv no thiab tshem tawm kom tso lub cim xeeb.
Ntawm no, puas unset dawb nco PHP?
tsis teem tseg () ua tsuas yog nws lub npe hais tias - tsis teem tseg ib variable. Nws ua tsis yuam tam sim ntawd nco tso tseg . thaum koj sim siv qhov tsis muaj nyob ( tsis teem tseg ) variable, ib qho yuam kev yuav tshwm sim thiab tus nqi rau qhov sib txawv ntawm qhov qhia yuav yog null.
Dab tsi yog khib nyiab hauv cov ntaub ntawv qauv?
Cov khib nyiab . Hauv computer science, khib nyiab yog hom kev tswj hwm kev nco. Nws cia li ntxuav cov khoom tsis siv thiab cov taw qhia hauv lub cim xeeb, tso cai rau cov peev txheej rov qab siv dua. Cov khib nyiab tej zaum kuj yuav ua tau thaum compile-lub sij hawm, thaum ib qhov kev pab cuam qhov chaws muab tso ua ke rau hauv ib qho kev pab cuam executable.
Pom zoo:
Java khib nyiab nqi yog dab tsi?
Ib qho kev sib txawv yog pib nrog tus nqi khib nyiab, txhais tau hais tias qee cov ntaub ntawv random tau muab tso rau hauv nws (xws li hauv String[], koj pib nrog cov cim xws li "????х??????Ð?ȕȨ????" nyob rau hauv ib co ntawm lawv) Yog hais tias qhov no tshwm sim, ib yam dab tsi tsis ncaj ncees lawm nrog koj Java VM
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