php导出csv文件乱码问题解决方法
php导出csv文件乱码问题解决方法
说 这个问题之前首先来说一下什么是CSV文件?Comma Separator Value(逗号分隔值)是也。常常用来数据转换的中间文件存在,比如:从Mysql中导出数据到CSV,导入CSV到SqlServer中。在 Linux下用PHP脚本从Mysql数据库中将表的数据按照条件导出成csv,使用utf-8编码导出CSV文件,打开后里边的中文成了乱码 (Windows下CSV文件默认与Microsoft Excel关联),用Notepad++或者Word打开正常,不过排版很乱。原因:BOM惹的祸,微软惹的祸。
什么是BOM?Byte Order Mark(比特序标记)是也。
为 了识别 Unicode 文件,Microsoft 建议所有的 Unicode 文件应该以 ZERO WIDTH NOBREAK SPACE字符开头。这作为一个”特征符”或”字节顺序标记(byte-order mark,BOM)”来识别文件中使用的编码和字节顺序(big-endian或little-endian),具体的对应关系见下表。
?
00 00 FE FF | UTF-32, big-endian |
FF FE 00 00 | UTF-32, little-endian |
FE FF | UTF-16, big-endian |
FF FE | UTF-16, little-endian |
EF BB BF | UTF-8 |
?
类Unix系统中并没有使用 BOM,因为它会破坏现有的 ASCII 文件的语法约定。
实现代码如果
<?php $str = "哈,哈,哈,哈"; $fp = fopen("a.csv","a"); //在写入数据之前先把bom头写到文件里 fwrite($fp,"\xEF\xBB\xBF"); //再写入数据 php程序员站 fwrite($fp,$str); phperz.com fclose($fp); phperz.com ?>
注:在写csv文件时确保php源码是utf-8,并且无BOM,并且没有输出任何内容。
BOM实际上挺烦人,如果你的网页(*.html)有BOM,在IE6.x下面打开会发现一神奇的空行,Firefox下却没有
?
来源:http://www.i-felix.cn/blog/phpdao-chu-csvwen-jian-luan-ma-wen-ti-jie-jue-fang-fa-gai-si-de-wei-ruan
?
?

APHPDependencyInjectionContainerisatoolthatmanagesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itactsasacentralhubforcreatingandinjectingdependencies,thusreducingtightcouplingandeasingunittesting.

Select DependencyInjection (DI) for large applications, ServiceLocator is suitable for small projects or prototypes. 1) DI improves the testability and modularity of the code through constructor injection. 2) ServiceLocator obtains services through center registration, which is convenient but may lead to an increase in code coupling.

PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

PHPemailvalidationinvolvesthreesteps:1)Formatvalidationusingregularexpressionstochecktheemailformat;2)DNSvalidationtoensurethedomainhasavalidMXrecord;3)SMTPvalidation,themostthoroughmethod,whichchecksifthemailboxexistsbyconnectingtotheSMTPserver.Impl

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

ToimprovePHPapplicationspeed,followthesesteps:1)EnableopcodecachingwithAPCutoreducescriptexecutiontime.2)ImplementdatabasequerycachingusingPDOtominimizedatabasehits.3)UseHTTP/2tomultiplexrequestsandreduceconnectionoverhead.4)Limitsessionusagebyclosin

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


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Dreamweaver Mac version
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
