search
HomeBackend DevelopmentPHP Tutorialphp数组添加元素方法小结_PHP

本文较为详细的总结了php数组添加元素方法。分享给大家供大家参考。具体分析如下:

如果我们是一维数组增加数组元素我们可以使用ArrayListay_push,当然除这种方法之外我们还有更直接的办法,这里就来给大家整理一下.

一维数组增加元素

代码如下:

$ArrayList = ArrayListay();
Array_push($ArrayList, el1, el2 ... eln);

但其实有一种更直接方便的做法,代码如下:

代码如下:

$ArrayList = ArrayListay();  
$ArrayList[] = el1;  
$ArrayList[] = el2;  
...  
$ArrayList[] = eln;


两种方法得出的效果是一样的.

添加一个或多个元素,代码如下:

代码如下:

    $ArrayList1 = ArrayListay("a", "b");
    Array_push($ArrayList1, "c", "d");
    print_r($ArrayList1);
  ?>


运行结果如下:

代码如下:

ArrayListay
  (
   [0] => a
   [1] => b
   [2] => c
   [3] => d
)


注:如果第一个参数不是数组,ArrayListay_push() 将发出一条警告.

在数组开头插入元素

1. ArrayListay_unshift,使用方法,代码如下:

代码如下:

$array_Qlist = ArrayListay("军民联防", "banana");
Array_unshift($array_Qlist, "西瓜", "");
print_r($array_Qlist);
?>


 
输出如下:

代码如下:

ArrayListay
(
    [0] => 西瓜
    [1] =>
    [2] => 军民联防
    [3] => banana
)


数组添加关联元素使用ArrayListay_push或者ArrayListay_unshift是行不通的,那么我们要如何增加呢,使用ArrayListay_merge方法实现类似ArrayListay_unshift在开头添加元素的功能,代码如下:

代码如下:

$array_Qlist = ArrayListay('a', 'B');
$array_Qlist = Array_merge(ArrayListay('front' => '你好www.bitsCN.com'), $array_Qlist);
/*
ArrayListay
(
    [front] => 你好www.bitsCN.com
    [0] => a
    [1] => b
)
*/
?>


2. +操作符,代码如下:

代码如下:

$array_Qlist = Array('a', 'B');
$array_Qlist = Array('front' => '你好小www.bitsCN.com') + $array_Qlist;
?>


输出结果与使用ArrayListay_merge方法一样.

3. 在元素结尾添加关联数组元素,代码如下:

代码如下:

$array_Qlist = ArrayListay('a', 'B');
$array_Qlist['front'] = '你好www.bitsCN.com';
/*
输出
ArrayListay
(
    [0] => a
    [1] => b
    [front] => 你好www.bitsCN.com  
)
*/
?>


至于有些朋友说Array_push增加元素与直接$a[]='a'这种性能要差点之外其它的都是一样,如果只要一个值就没可比性了.

希望本文所述对大家的PHP程序设计有所帮助。

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
PHP Performance Tuning for High Traffic WebsitesPHP Performance Tuning for High Traffic WebsitesMay 14, 2025 am 12:13 AM

ThesecrettokeepingaPHP-poweredwebsiterunningsmoothlyunderheavyloadinvolvesseveralkeystrategies:1)ImplementopcodecachingwithOPcachetoreducescriptexecutiontime,2)UsedatabasequerycachingwithRedistolessendatabaseload,3)LeverageCDNslikeCloudflareforservin

Dependency Injection in PHP: Code Examples for BeginnersDependency Injection in PHP: Code Examples for BeginnersMay 14, 2025 am 12:08 AM

You should care about DependencyInjection(DI) because it makes your code clearer and easier to maintain. 1) DI makes it more modular by decoupling classes, 2) improves the convenience of testing and code flexibility, 3) Use DI containers to manage complex dependencies, but pay attention to performance impact and circular dependencies, 4) The best practice is to rely on abstract interfaces to achieve loose coupling.

PHP Performance: is it possible to optimize the application?PHP Performance: is it possible to optimize the application?May 14, 2025 am 12:04 AM

Yes,optimizingaPHPapplicationispossibleandessential.1)ImplementcachingusingAPCutoreducedatabaseload.2)Optimizedatabaseswithindexing,efficientqueries,andconnectionpooling.3)Enhancecodewithbuilt-infunctions,avoidingglobalvariables,andusingopcodecaching

PHP Performance Optimization: The Ultimate GuidePHP Performance Optimization: The Ultimate GuideMay 14, 2025 am 12:02 AM

ThekeystrategiestosignificantlyboostPHPapplicationperformanceare:1)UseopcodecachinglikeOPcachetoreduceexecutiontime,2)Optimizedatabaseinteractionswithpreparedstatementsandproperindexing,3)ConfigurewebserverslikeNginxwithPHP-FPMforbetterperformance,4)

PHP Dependency Injection Container: A Quick StartPHP Dependency Injection Container: A Quick StartMay 13, 2025 am 12:11 AM

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

Dependency Injection vs. Service Locator in PHPDependency Injection vs. Service Locator in PHPMay 13, 2025 am 12:10 AM

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.

PHP performance optimization strategies.PHP performance optimization strategies.May 13, 2025 am 12:06 AM

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

PHP Email Validation: Ensuring Emails Are Sent CorrectlyPHP Email Validation: Ensuring Emails Are Sent CorrectlyMay 13, 2025 am 12:06 AM

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

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

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

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.

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.