Avoid N 1 query problems, reduce the number of database queries by loading associated data in advance; 2. Select only the required fields to avoid loading complete entities to save memory and bandwidth; 3. Use cache strategies reasonably, such as Doctrine's secondary cache or Redis cache high-frequency query results; 4. Optimize the entity life cycle and call clear() regularly to free up memory to prevent memory overflow; 5. Ensure that the database index exists and analyze the generated SQL statements to avoid inefficient queries; 6. Disable automatic change tracking in scenarios where changes are not required, and use arrays or lightweight modes to improve performance. Correct use of ORM requires combining SQL monitoring, caching, batch processing and appropriate optimization to ensure application performance while maintaining development efficiency.

ReadonlypropertiesinPHP8.2canonlybeassignedonceintheconstructororatdeclarationandcannotbemodifiedafterward,enforcingimmutabilityatthelanguagelevel.2.Toachievedeepimmutability,wrapmutabletypeslikearraysinArrayObjectorusecustomimmutablecollectionssucha

BCMathisessentialforaccuratecryptocurrencycalculationsinPHPbecausefloating-pointarithmeticintroducesunacceptableroundingerrors.1.Floating-pointnumberslike0.1 0.2yieldimpreciseresults(e.g.,0.30000000000000004),whichisproblematicincryptowhereprecisionu

PHPevaluatesconstantexpressionsatcompiletimetoimproveperformanceandenableearlyerrordetection.1.Constantexpressionevaluationmeanscomputingvaluesduringcompilationwhenalloperandsareknownconstantslikeliterals,classconstants,orpredefinedconstants.2.PHP’se

Rawstringsindomain-drivenapplicationsshouldbereplacedwithvalueobjectstopreventbugsandimprovetypesafety;1.Usingrawstringsleadstoprimitiveobsession,whereinterchangeablestringtypescancausesubtlebugslikeargumentswapping;2.ValueobjectssuchasEmailAddressen

UseGuzzleforrobustHTTPrequestswithheadersandtimeouts.2.ParseHTMLefficientlywithSymfonyDomCrawlerusingCSSselectors.3.HandleJavaScript-heavysitesbyintegratingPuppeteerviaPHPexec()torenderpages.4.Respectrobots.txt,adddelays,rotateuseragents,anduseproxie

Floating point numbers are inaccurate is a common problem in PHP. The answer is that it uses IEEE754 double-precision format, which makes decimal decimals unable to be accurately represented; numbers such as 1.0.1 or 0.2 are infinite loop decimals in binary, and the computer needs to truncate them to cause errors; 2. When comparing floating point numbers, you should use tolerance instead of ==, such as abs($a-$b)

Switchcanbeslightlyfasterthanif-elsewhencomparingasinglevariableagainstmultiplescalarvalues,especiallywithmanycasesorcontiguousintegersduetopossiblejumptableoptimization;2.If-elseisevaluatedsequentiallyandbettersuitedforcomplexconditionsinvolvingdiff