Backend Development
PHP Tutorial
PHP combination, PHP permutation and combination algorithm_PHP tutorial
PHP combination, PHP permutation and combination algorithm_PHP tutorial
Jul 12, 2016 am 08:53 AM
php combination, php permutation and combination algorithm
In order to improve the reusability of the code and reduce the coupling of the code (two ways of combination implementation)
Mode 1:
<span> 1</span> <?<span>php
</span><span> 2</span> <span>//</span><span>組合模式一</span>
<span> 3</span> <span>class</span><span> Person{
</span><span> 4</span> <span>public</span> <span>function</span><span> eat(){
</span><span> 5</span> <span>echo</span> "eat.<br/>"<span>;
</span><span> 6</span> <span> }
</span><span> 7</span> <span>}
</span><span> 8</span>
<span> 9</span> <span>class</span><span> Phone{
</span><span>10</span> <span>public</span> <span>function</span><span> call(){
</span><span>11</span> <span>echo</span> "phone call.<br/>"<span>;
</span><span>12</span> <span> }
</span><span>13</span> <span>}
</span><span>14</span>
<span>15</span> <span>//</span><span>學(xué)生也需要call()這個(gè)方法，為了提高代碼的復(fù)用性(組合)</span>
<span>16</span> <span>class</span> Student <span>extends</span><span> Person{
</span><span>17</span> <span>private</span> <span>$people</span><span>;
</span><span>18</span> <span>public</span> <span>function</span><span> learning(){
</span><span>19</span> <span>echo</span> "learn.<br/>"<span>;
</span><span>20</span> <span> }
</span><span>21</span> <span>public</span> <span>function</span> func(<span>$class</span>, <span>$method</span>){<span>//</span><span>兼容多個(gè)類(lèi)的多個(gè)方法</span>
<span>22</span> <span>$this</span>->people = <span>new</span> <span>$class</span><span>;
</span><span>23</span> <span>$this</span>->people-><span>$method</span><span>();
</span><span>24</span> <span> }
</span><span>25</span> <span>}
</span><span>26</span>
<span>27</span> <span>$student</span> = <span>new</span><span> Student();
</span><span>28</span> <span>$student</span>-><span>eat();
</span><span>29</span> <span>$student</span>->func('Phone', 'call'<span>);
</span><span>30</span> <span>$student</span>->learning();
Mode 2:
"; 6 } 7 } 8 9 trait Drive{ 10 public function call(){ 11 echo "phone call.
"; 12 } 13 } 14 15 class Student extends Person{ 16 use Drive; 17 public function learning(){ 18 echo "learn.
"; 19 } 20 } 21 22 $student = new Student(); 23 $student->eat(); 24 25 //When a method or attribute has the same name, the method in the current class will override the method of the trait, and the method of the trait will override the method in the base class 26 $student->call(); 27 $student->learning(); View Code
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
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
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How do I stay up-to-date with the latest PHP developments and best practices?
Jun 23, 2025 am 12:56 AM
TostaycurrentwithPHPdevelopmentsandbestpractices,followkeynewssourceslikePHP.netandPHPWeekly,engagewithcommunitiesonforumsandconferences,keeptoolingupdatedandgraduallyadoptnewfeatures,andreadorcontributetoopensourceprojects.First,followreliablesource
What is PHP, and why is it used for web development?
Jun 23, 2025 am 12:55 AM
PHPbecamepopularforwebdevelopmentduetoitseaseoflearning,seamlessintegrationwithHTML,widespreadhostingsupport,andalargeecosystemincludingframeworkslikeLaravelandCMSplatformslikeWordPress.Itexcelsinhandlingformsubmissions,managingusersessions,interacti
How to set PHP time zone?
Jun 25, 2025 am 01:00 AM
TosettherighttimezoneinPHP,usedate_default_timezone_set()functionatthestartofyourscriptwithavalididentifiersuchas'America/New_York'.1.Usedate_default_timezone_set()beforeanydate/timefunctions.2.Alternatively,configurethephp.inifilebysettingdate.timez
How do I validate user input in PHP to ensure it meets certain criteria?
Jun 22, 2025 am 01:00 AM
TovalidateuserinputinPHP,usebuilt-invalidationfunctionslikefilter_var()andfilter_input(),applyregularexpressionsforcustomformatssuchasusernamesorphonenumbers,checkdatatypesfornumericvalueslikeageorprice,setlengthlimitsandtrimwhitespacetopreventlayout
What is data serialization in PHP (serialize(), unserialize())?
Jun 22, 2025 am 01:03 AM
ThePhpfunctionSerialize () andunserialize () AreusedtoconvertcomplexdaTastructdestoresintostoraSandaBackagain.1.Serialize () c OnvertsdatalikecarraysorobjectsraystringcontainingTypeandstructureinformation.2.unserialize () Reconstruct theoriginalatataprom
How do I embed PHP code in an HTML file?
Jun 22, 2025 am 01:00 AM
You can embed PHP code into HTML files, but make sure that the file has an extension of .php so that the server can parse it correctly. Use standard tags to wrap PHP code, insert dynamic content anywhere in HTML. In addition, you can switch PHP and HTML multiple times in the same file to realize dynamic functions such as conditional rendering. Be sure to pay attention to the server configuration and syntax correctness to avoid problems caused by short labels, quotation mark errors or omitted end labels.
What are the best practices for writing clean and maintainable PHP code?
Jun 24, 2025 am 12:53 AM
The key to writing clean and easy-to-maintain PHP code lies in clear naming, following standards, reasonable structure, making good use of comments and testability. 1. Use clear variables, functions and class names, such as $userData and calculateTotalPrice(); 2. Follow the PSR-12 standard unified code style; 3. Split the code structure according to responsibilities, and organize it using MVC or Laravel-style catalogs; 4. Avoid noodles-style code and split the logic into small functions with a single responsibility; 5. Add comments at key points and write interface documents to clarify parameters, return values ??and exceptions; 6. Improve testability, adopt dependency injection, reduce global state and static methods. These practices improve code quality, collaboration efficiency and post-maintenance ease.
How do I execute SQL queries using PHP?
Jun 24, 2025 am 12:54 AM
Yes,youcanrunSQLqueriesusingPHP,andtheprocessinvolveschoosingadatabaseextension,connectingtothedatabase,executingqueriessafely,andclosingconnectionswhendone.Todothis,firstchoosebetweenMySQLiorPDO,withPDObeingmoreflexibleduetosupportingmultipledatabas
