The example in this article describes the simple method of batch uploading images in PHP. Share it with everyone for your reference, the details are as follows:
<?php function upload_multi($path,$photo,$i){ $uploaddir = './'.$path;//文件存放目录 if(!file_exists($uploaddir))//如果目录不存在就新建 $uploaddir=mkdir($uploaddir); $piece = explode('.',$photo['name'][$i]); $uploadfile = $uploaddir . '/'.md5($piece[0]).'.'.$piece[1]; $result = move_uploaded_file($photo['tmp_name'][$i], $uploadfile); if(!$result){ exit('上传失败'); } return basename($uploadfile); } if($_POST['tijiao']){ extract($_POST); $i=0; foreach ($_FILES["pictures"]["error"] as $key => $error) { if ($error == UPLOAD_ERR_OK) { upload_multi($email,$_FILES["pictures"],$i); } $i++; } } ?> <script language="javascript"> function go_up(){ document.getElementById('new_up').innerHTML+='<input type="file" name="pictures[]" /><br>'; } </script> <form action="index.php" method="post" enctype="multipart/form-data"> <p>多图片上传</p><br> <input type="file" name="pictures[]" /><br> <div id="new_up"></div> <input type="button"" name="add_img" value="新增上传" onclick="go_up()"/><br> <input type="submit" value="Send" name="tijiao"/><br> </form>
Readers who are interested in more PHP-related content can check out the special topics on this site: "Summary of PHP file operations", "Summary of PHP operations and operator usage", "Summary of PHP network programming skills", "Introduction to PHP basic syntax tutorial", "Summary of PHP operating office document skills (including word, excel, access, ppt)" , "php date and time usage summary", "php object-oriented programming introductory tutorial", "php string (string) usage summary", " php mysql database operation introductory tutorial" and "php common database operation skills summary"
I hope this article will be helpful to everyone in PHP programming.

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

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

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.

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

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


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