search
HomeBackend DevelopmentPHP TutorialThe latest classic PHP interview questions and answers in 2019, a must-read for PHP programmers

1、用最少的代码写一个求3值最大值的函数.

function who($a,$b,$c) {
return $a > $b ? ($a > $c ? $a : $c) : ($b > $c ? $b : $c);
}
echo who(33,53,12);

2、求两个日期的差数,例如2007-2-5 ~ 2007-3-6 的日期差数

$date1 = strtotime('2013-09-09');
$date2 = strtotime('2011-12-11');
echo ($date1-$date2)/(24*3600);

3、函数实现-字符串“open_door" 转换成 “OpenDoor"、"make_by_id" 转换成 "MakeById"。

function towords($str) {
$newStr = str_replace("_"," ",$str);
$newStr = ucwords($str);
$newStr = str_replace(" ","_",$str);
return $newStr;
}
echo towords("open_door");

4、echo count('abc'); 输出的结果是什么

结果为1

5、用pHp写出显示客户端Ip与服务器Ip的代码

echo getenv('REMOTE_ADDR');
echo getenv('SERVER_ADDR');
echo gethostbyname(&#39;<a href="http://www.baidu.com/">www.baidu.com</a>&#39;);

6、 error_reporting(2047)什么作用?

相当于 error_reporting('E_ALL'); 输出所有的错误

7、打开php.ini中的Safe_mode,会影响哪些参数?至少说出6个。

此模块打开时,php将检查当前脚本的拥有者是否和被操作文件的拥有者相同,因此,将影响文件操作类函数,程序执行函数 (program Execution Functions)。这些函数有.pathinfo,basename,fopen,system,exec,proc_open 等函数;

8、请写一个函数验证电子邮件的格式是否正确(要求使用正则)

function checkEmail($mail){
$reg= &#39;/^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$/&#39;;
$rst = preg_match($reg,$mail);
if($rst){
return TRUE;
} else {
return FALSE;
}
}

9、写个函数用来对二维数组排序。

array_multisort()

10、问题:请用最简单的语言告诉我PHP是什么?

回答:PHP全称:Hypertext Preprocessor,是一种用来开发动态网站的服务器脚本语言。

The above is the detailed content of The latest classic PHP interview questions and answers in 2019, a must-read for PHP programmers. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How to make PHP applications fasterHow to make PHP applications fasterMay 12, 2025 am 12:12 AM

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

PHP Performance Optimization Checklist: Improve Speed NowPHP Performance Optimization Checklist: Improve Speed NowMay 12, 2025 am 12:07 AM

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

PHP Dependency Injection: Improve Code TestabilityPHP Dependency Injection: Improve Code TestabilityMay 12, 2025 am 12:03 AM

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.

PHP Performance Optimization: Database Query OptimizationPHP Performance Optimization: Database Query OptimizationMay 12, 2025 am 12:02 AM

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

Simple Guide: Sending Email with PHP ScriptSimple Guide: Sending Email with PHP ScriptMay 12, 2025 am 12:02 AM

PHPisusedforsendingemailsduetoitsbuilt-inmail()functionandsupportivelibrarieslikePHPMailerandSwiftMailer.1)Usethemail()functionforbasicemails,butithaslimitations.2)EmployPHPMailerforadvancedfeatureslikeHTMLemailsandattachments.3)Improvedeliverability

PHP Performance: Identifying and Fixing BottlenecksPHP Performance: Identifying and Fixing BottlenecksMay 11, 2025 am 12:13 AM

PHP performance bottlenecks can be solved through the following steps: 1) Use Xdebug or Blackfire for performance analysis to find out the problem; 2) Optimize database queries and use caches, such as APCu; 3) Use efficient functions such as array_filter to optimize array operations; 4) Configure OPcache for bytecode cache; 5) Optimize the front-end, such as reducing HTTP requests and optimizing pictures; 6) Continuously monitor and optimize performance. Through these methods, the performance of PHP applications can be significantly improved.

Dependency Injection for PHP: a quick summaryDependency Injection for PHP: a quick summaryMay 11, 2025 am 12:09 AM

DependencyInjection(DI)inPHPisadesignpatternthatmanagesandreducesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itallowspassingdependencieslikedatabaseconnectionstoclassesasparameters,facilitatingeasiertestingandscalability.

Increase PHP Performance: Caching Strategies & TechniquesIncrease PHP Performance: Caching Strategies & TechniquesMay 11, 2025 am 12:08 AM

CachingimprovesPHPperformancebystoringresultsofcomputationsorqueriesforquickretrieval,reducingserverloadandenhancingresponsetimes.Effectivestrategiesinclude:1)Opcodecaching,whichstorescompiledPHPscriptsinmemorytoskipcompilation;2)DatacachingusingMemc

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

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

Hot Article

Hot Tools

SecLists

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.

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools

MinGW - Minimalist GNU for Windows

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.

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools