来源:
php输出页面所有变量print_r(get_defined_vars());
此函数返回一个包含所有已定义变量列表的多维数组,这些变量包括环境变量、服务器变量和用户定义的变量。
获取所有已经定义的函数get_defined_functions()获取所有可用的模块
get_loaded_extensions()获取指定模块的可用函数
get_extension_funcs()
该函数返回指定模块所有可用的函数。传入的参数(模块名称)必须是小写
获取关联数组的名字所有的常量和他们的值 ? (PHP 4 >= 4.1.0, PHP 5)get_defined_constants()
get_declared_classes (PHP 4, PHP 5) ? 获取由已定义类的名字所组成的数组
get_declared_classes()
get_included_files()(或者get_require_files) (PHP 4, PHP 5) ? 获取由已定义类的名字所组成的数组
get_included_files()

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TomakePHPapplicationsfaster,followthesesteps:1)UseOpcodeCachinglikeOPcachetostoreprecompiledscriptbytecode.2)MinimizeDatabaseQueriesbyusingquerycachingandefficientindexing.3)LeveragePHP7 Featuresforbettercodeefficiency.4)ImplementCachingStrategiessuc

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Dependency injection (DI) significantly improves the testability of PHP code by explicitly transitive dependencies. 1) DI decoupling classes and specific implementations make testing and maintenance more flexible. 2) Among the three types, the constructor injects explicit expression dependencies to keep the state consistent. 3) Use DI containers to manage complex dependencies to improve code quality and development efficiency.

DatabasequeryoptimizationinPHPinvolvesseveralstrategiestoenhanceperformance.1)Selectonlynecessarycolumnstoreducedatatransfer.2)Useindexingtospeedupdataretrieval.3)Implementquerycachingtostoreresultsoffrequentqueries.4)Utilizepreparedstatementsforeffi


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