PHP常用的基本文件和目录操作总结,
PHP常用的基本文件和目录操作总结,
来源:http://www.ido321.com/835.html
一、基本文件的操作
文件的基本操作有:文件判断、目录判断、文件大小、读写性判断、存在性判断及文件时间等
<span id="lnum1"> 1:</span><span> <?php</span>
<span id="lnum2"> 2:</span><span> header(<span>"content-type"</span>,<span>"text/html;charset=utf-8"</span>);</span>
<span id="lnum3"> 3:</span><span> <span>/*</span></span>
<span id="lnum4"> 4:</span><span> <span>*声明一个函数,传入文件名获取文件属性</span></span>
<span id="lnum5"> 5:</span><span> <span>*@param string $fileName 文件名称</span></span>
<span id="lnum6"> 6:</span><span> <span>*/</span></span>
<span id="lnum7"> 7:</span><span> <span>function</span> getFilePro($fileName)</span>
<span id="lnum8"> 8:</span><span> {</span>
<span id="lnum9"> 9:</span><span> <span>if</span>(!file_exists($fileName))</span>
<span id="lnum10"> 10:</span><span> {</span>
<span id="lnum11"> 11:</span><span> <span>echo</span> <span>'文件不存在<br/>'</span>;</span>
<span id="lnum12"> 12:</span><span> <span>return</span>;</span>
<span id="lnum13"> 13:</span><span> }</span>
<span id="lnum14"> 14:</span><span> <span>/*是否是普通文件*/</span></span>
<span id="lnum15"> 15:</span><span> <span>if</span>(is_file($fileName))</span>
<span id="lnum16"> 16:</span><span> {</span>
<span id="lnum17"> 17:</span><span> <span>echo</span> $fileName.<span>'是一个文件<br/>'</span>;</span>
<span id="lnum18"> 18:</span><span> }</span>
<span id="lnum19"> 19:</span><span> <span>/*是否是目录*/</span></span>
<span id="lnum20"> 20:</span><span> <span>if</span>(is_dir($fileName))</span>
<span id="lnum21"> 21:</span><span> {</span>
<span id="lnum22"> 22:</span><span> <span>echo</span> $fileName.<span>'是一个目录'</span>;</span>
<span id="lnum23"> 23:</span><span> }</span>
<span id="lnum24"> 24:</span><span> <span>/*输出文件的型态*/</span></span>
<span id="lnum25"> 25:</span><span> <span>echo</span> <span>'文件型态是:'</span>.getFileType($fileName).<span>'<br/>'</span>;</span>
<span id="lnum26"> 26:</span><span> <span>/*文件大小,转换单位*/</span></span>
<span id="lnum27"> 27:</span><span> <span>echo</span> <span>'文件大小是:'</span>.getFileSize(filesize($fileName)).<span>'<br/>'</span>;</span>
<span id="lnum28"> 28:</span><span> <span>/*文件是否可读*/</span></span>
<span id="lnum29"> 29:</span><span> <span>if</span>(is_readable($fileName))</span>
<span id="lnum30"> 30:</span><span> {</span>
<span id="lnum31"> 31:</span><span> <span>echo</span> <span>'文件可读<br/>'</span>;</span>
<span id="lnum32"> 32:</span><span> }</span>
<span id="lnum33"> 33:</span><span> <span>/*文件是否可写*/</span></span>
<span id="lnum34"> 34:</span><span> <span>if</span>(is_writable($fileName))</span>
<span id="lnum35"> 35:</span><span> {</span>
<span id="lnum36"> 36:</span><span> <span>echo</span> <span>'文件可写<br/>'</span>;</span>
<span id="lnum37"> 37:</span><span> }</span>
<span id="lnum38"> 38:</span><span> <span>/*文件是否可执行*/</span></span>
<span id="lnum39"> 39:</span><span> <span>if</span>(is_executable($fileName))</span>
<span id="lnum40"> 40:</span><span> {</span>
<span id="lnum41"> 41:</span><span> <span>echo</span> <span>'文件可执行<br/>'</span>;</span>
<span id="lnum42"> 42:</span><span> }</span>
<span id="lnum43"> 43:</span>
<span id="lnum44"> 44:</span><span> <span>echo</span> <span>'文件创立时间:'</span>.date(<span>'Y年m月j日'</span>,filectime($fileName)).<span>'<br/>'</span>;</span>
<span id="lnum45"> 45:</span><span> <span>echo</span> <span>'文件最后修改时间:'</span>.date(<span>'Y年m月j日'</span>,filemtime($fileName)).<span>'<br/>'</span>;</span>
<span id="lnum46"> 46:</span><span> <span>echo</span> <span>'文件最后打开时间:'</span>.date(<span>'Y年m月j日'</span>,fileatime($fileName)).<span>'<br/>'</span>;</span>
<span id="lnum47"> 47:</span><span> }</span>
<span id="lnum48"> 48:</span>
<span id="lnum49"> 49:</span><span> <span>/*</span></span>
<span id="lnum50"> 50:</span><span> <span>*声明一个函数,返回文件类型</span></span>
<span id="lnum51"> 51:</span><span> <span>*@param string $fileName 文件名称</span></span>
<span id="lnum52"> 52:</span><span> <span>*/</span></span>
<span id="lnum53"> 53:</span><span> <span>function</span> getFileType($fileName)</span>
<span id="lnum54"> 54:</span><span> {</span>
<span id="lnum55"> 55:</span><span> $type = <span>''</span>;</span>
<span id="lnum56"> 56:</span><span> <span>switch</span>(filetype($fileName))</span>
<span id="lnum57"> 57:</span><span> {</span>
<span id="lnum58"> 58:</span><span> <span>case</span> <span>'file'</span>:$type .= <span>'普通文件'</span>;<span>break</span>;</span>
<span id="lnum59"> 59:</span><span> <span>case</span> <span>'dir'</span>:$type .= <span>'目录文件'</span>;<span>break</span>;</span>
<span id="lnum60"> 60:</span><span> <span>case</span> <span>'block'</span>:$type .= <span>'块设备文件'</span>;<span>break</span>;</span>
<span id="lnum61"> 61:</span><span> <span>case</span> <span>'char'</span>:$type .= <span>'字符设备文件'</span>;<span>break</span>;</span>
<span id="lnum62"> 62:</span><span> <span>case</span> <span>'filo'</span>:$type .= <span>'管道文件'</span>;<span>break</span>;</span>
<span id="lnum63"> 63:</span><span> <span>case</span> <span>'link'</span>:$type .= <span>'符号链接'</span>;<span>break</span>;</span>
<span id="lnum64"> 64:</span><span> <span>case</span> <span>'unknown'</span>:$type .= <span>'未知文件'</span>;<span>break</span>;</span>
<span id="lnum65"> 65:</span><span> <span>default</span>:</span>
<span id="lnum66"> 66:</span><span> }</span>
<span id="lnum67"> 67:</span><span> <span>return</span> $type;</span>
<span id="lnum68"> 68:</span><span> }</span>
<span id="lnum69"> 69:</span>
<span id="lnum70"> 70:</span><span> <span>/*</span></span>
<span id="lnum71"> 71:</span><span> <span>*声明一个函数,返回文件大小</span></span>
<span id="lnum72"> 72:</span><span> <span>*@param int $bytes 文件字节数</span></span>
<span id="lnum73"> 73:</span><span> <span>*/</span></span>
<span id="lnum74"> 74:</span><span> <span>function</span> getFileSize($bytes)</span>
<span id="lnum75"> 75:</span><span> {</span>
<span id="lnum76"> 76:</span><span> <span>if</span>($bytes >= pow(2,40))</span>
<span id="lnum77"> 77:</span><span> {</span>
<span id="lnum78"> 78:</span><span> $<span>return</span> = round($bytes / pow(1024,4),2);</span>
<span id="lnum79"> 79:</span><span> $suffix = <span>'TB'</span>;</span>
<span id="lnum80"> 80:</span><span> }</span>
<span id="lnum81"> 81:</span><span> <span>else</span> <span>if</span>($bytes >= pow(2,30))</span>
<span id="lnum82"> 82:</span><span> {</span>
<span id="lnum83"> 83:</span><span> $<span>return</span> = round($bytes / pow(1024,3),2);</span>
<span id="lnum84"> 84:</span><span> $suffix = <span>'GB'</span>;</span>
<span id="lnum85"> 85:</span><span> }</span>
<span id="lnum86"> 86:</span><span> <span>else</span> <span>if</span>($bytes >= pow(2,20))</span>
<span id="lnum87"> 87:</span><span> {</span>
<span id="lnum88"> 88:</span><span> $<span>return</span> = round($bytes / pow(1024,2),2);</span>
<span id="lnum89"> 89:</span><span> $suffix = <span>'MB'</span>;</span>
<span id="lnum90"> 90:</span><span> }</span>
<span id="lnum91"> 91:</span><span> <span>else</span> <span>if</span>($bytes >= pow(2,10))</span>
<span id="lnum92"> 92:</span><span> {</span>
<span id="lnum93"> 93:</span><span> $<span>return</span> = round($bytes / pow(1024,1),2);</span>
<span id="lnum94"> 94:</span><span> $suffix = <span>'KB'</span>;</span>
<span id="lnum95"> 95:</span><span> }</span>
<span id="lnum96"> 96:</span><span> <span>else</span></span>
<span id="lnum97"> 97:</span><span> {</span>
<span id="lnum98"> 98:</span><span> $<span>return</span> = $bytes;</span>
<span id="lnum99"> 99:</span><span> $suffix = <span>'B'</span>;</span>
<span id="lnum100"> 100:</span><span> }</span>
<span id="lnum101"> 101:</span><span> <span>return</span> $<span>return</span>.<span>" "</span>.$suffix;</span>
<span id="lnum102"> 102:</span><span> }</span>
<span id="lnum103"> 103:</span>
<span id="lnum104"> 104:</span><span> <span>/*调用函数,传入test目录下的test.txt文件*/</span></span>
<span id="lnum105"> 105:</span><span> getFilePro(<span>'./test/div.html'</span>);</span>
<span id="lnum106"> 106:</span><span> ?></span>
二、目录的操作
目录的操作有:遍历目录、删除、复制、大小统计等
1、遍历目录
<span id="lnum1"> 1:</span><span> <span>/*</span></span>
<span id="lnum2"> 2:</span><span> <span>*遍历目录</span></span>
<span id="lnum3"> 3:</span><span> <span>*@param string $dirName 目录名</span></span>
<span id="lnum4"> 4:</span><span> <span>*/</span></span>
<span id="lnum5"> 5:</span><span> <span>function</span> findDir($dirName)</span>
<span id="lnum6"> 6:</span><span> {</span>
<span id="lnum7"> 7:</span><span> $num = 0; <span>/*统计子文件个数*/</span></span>
<span id="lnum8"> 8:</span><span> $dir_handle = opendir($dirName); <span>/*打开目录*/</span></span>
<span id="lnum9"> 9:</span><span> <span>/*输出目录文件*/</span></span>
<span id="lnum10"> 10:</span><span> <span>echo</span> <span>'<table border="0" align="center" width="600" cellspacing="0" cellpadding="0">'</span>;</span>
<span id="lnum11"> 11:</span><span> <span>echo</span> <span>'<caption><h2 id="目录-span-dirName-span-下的文件">目录'</span>.$dirName.<span>'下的文件</h2></caption>'</span>;</span>
<span id="lnum12"> 12:</span><span> <span>echo</span> <span>'<tr align="left" bgcolor="#cccccc"'</span>;</span>
<span id="lnum13"> 13:</span><span> <span>echo</span> <span>'<th>文件名</th><th>文件大小</th><th>文件类型</th><th>修改时间</th></tr>'</span>;</span>
<span id="lnum14"> 14:</span>
<span id="lnum15"> 15:</span><span> <span>while</span>($file = readdir($dir_handle))</span>
<span id="lnum16"> 16:</span><span> {</span>
<span id="lnum17"> 17:</span><span> $dirFile = $dirName.<span>'/'</span>.$file;</span>
<span id="lnum18"> 18:</span><span> $bgcolor = $num++%2==0?<span>'#ffffff'</span>:<span>'#cccccc'</span>;</span>
<span id="lnum19"> 19:</span><span> <span>echo</span> <span>'<tr bgcolor='</span>.$bgcolor.<span>'>'</span>;</span>
<span id="lnum20"> 20:</span><span> <span>echo</span> <span>'<td>'</span>.$file.<span>'</td>'</span>;</span>
<span id="lnum21"> 21:</span><span> <span>echo</span> <span>'<td>'</span>.filesize($dirFile).<span>'</td>'</span>;</span>
<span id="lnum22"> 22:</span><span> <span>echo</span> <span>'<td>'</span>.filetype($dirFile).<span>'</td>'</span>;</span>
<span id="lnum23"> 23:</span><span> <span>echo</span> <span>'<td>'</span>.date(<span>'Y/n/t'</span>,filemtime($dirFile)).<span>'</td>'</span>;</span>
<span id="lnum24"> 24:</span><span> <span>echo</span> <span>'</tr>'</span>;</span>
<span id="lnum25"> 25:</span><span> }</span>
<span id="lnum26"> 26:</span><span> <span>echo</span> <span>"</table>"</span>;</span>
<span id="lnum27"> 27:</span><span> closedir($dir_handle); <span>/*关闭目录*/</span></span>
<span id="lnum28"> 28:</span><span> <span>echo</span> <span>"在<b>"</span>.$dirName.<span>"</b>目录下共有<b>"</span>.$num.<span>'</b>个子文件'</span>;</span>
<span id="lnum29"> 29:</span><span> }</span>
<span id="lnum30"> 30:</span><span> <span>/*传递当前目录下的test目录*/</span></span>
<span id="lnum31"> 31:</span><span> findDir(<span>'./test'</span>);</span>
结果
2、统计目录大小
<span id="lnum1"> 1:</span><span> <span>/*</span></span>
<span id="lnum2"> 2:</span><span> <span>*统计目录大小</span></span>
<span id="lnum3"> 3:</span><span> <span>*@param string $dirName 目录名</span></span>
<span id="lnum4"> 4:</span><span> <span>*@return double</span></span>
<span id="lnum5"> 5:</span><span> <span>*/</span></span>
<span id="lnum6"> 6:</span>
<span id="lnum7"> 7:</span><span> <span>function</span> dirSize($dirName)</span>
<span id="lnum8"> 8:</span><span> {</span>
<span id="lnum9"> 9:</span><span> $dir_size = 0;</span>
<span id="lnum10"> 10:</span><span> <span>if</span>($dir_handle = @opendir($dirName))</span>
<span id="lnum11"> 11:</span><span> {</span>
<span id="lnum12"> 12:</span><span> <span>while</span> ($fileName = readdir($dir_handle))</span>
<span id="lnum13"> 13:</span><span> {</span>
<span id="lnum14"> 14:</span> /*排除两个特殊目录*/
<span id="lnum15"> 15:</span><span> <span>if</span>($fileName != <span>'.'</span> && $fileName != <span>'..'</span>)</span>
<span id="lnum16"> 16:</span><span> {</span>
<span id="lnum17"> 17:</span><span> $subFile = $dirName.<span>'/'</span>.$fileName;</span>
<span id="lnum18"> 18:</span><span> <span>if</span>(is_file($subFile))</span>
<span id="lnum19"> 19:</span><span> {</span>
<span id="lnum20"> 20:</span><span> $dir_size += filesize($subFile);</span>
<span id="lnum21"> 21:</span><span> }</span>
<span id="lnum22"> 22:</span><span> <span>if</span>(is_dir($subFile))</span>
<span id="lnum23"> 23:</span><span> {</span>
<span id="lnum24"> 24:</span><span> $dir_size += dirSize($subFile);</span>
<span id="lnum25"> 25:</span><span> }</span>
<span id="lnum26"> 26:</span><span> }</span>
<span id="lnum27"> 27:</span><span> }</span>
<span id="lnum28"> 28:</span><span> closedir($dir_handle);</span>
<span id="lnum29"> 29:</span><span> <span>return</span> $dir_size;</span>
<span id="lnum30"> 30:</span><span> }</span>
<span id="lnum31"> 31:</span><span> }</span>
<span id="lnum32"> 32:</span><span> <span>/*传递当前目录下的test目录*/</span></span>
<span id="lnum33"> 33:</span><span> $dir_size = dirSize(<span>'./test'</span>);</span>
<span id="lnum34"> 34:</span><span> <span>echo</span> <span>'./test目录文件大小是:'</span>.round($dir_size / pow(1024,1),2).<span>'KB'</span>;</span>
结果
3、删除目录
<span id="lnum1"> 1:</span><span> <span>/*</span></span>
<span id="lnum2"> 2:</span><span> <span>*删除目录</span></span>
<span id="lnum3"> 3:</span><span> <span>*@param string $dirName 目录名</span></span>
<span id="lnum4"> 4:</span><span> <span>*/</span></span>
<span id="lnum5"> 5:</span><span> <span>function</span> delDir($dirName)</span>
<span id="lnum6"> 6:</span><span> {</span>
<span id="lnum7"> 7:</span><span> <span>/*php中的mkdir函数就可以创建目录*/</span></span>
<span id="lnum8"> 8:</span><span> <span>if</span>(file_exists($dirName))</span>
<span id="lnum9"> 9:</span><span> {</span>
<span id="lnum10"> 10:</span><span> <span>if</span>($dir_handle = @opendir($dirName))</span>
<span id="lnum11"> 11:</span><span> {</span>
<span id="lnum12"> 12:</span><span> <span>while</span> ($fileName = readdir($dir_handle))</span>
<span id="lnum13"> 13:</span><span> {</span>
<span id="lnum14"> 14:</span> /*排除两个特殊目录*/
<span id="lnum15"> 15:</span><span> <span>if</span>($fileName != <span>'.'</span> && $fileName != <span>'..'</span>)</span>
<span id="lnum16"> 16:</span><span> {</span>
<span id="lnum17"> 17:</span><span> $subFile = $dirName.<span>'/'</span>.$fileName;</span>
<span id="lnum18"> 18:</span><span> <span>if</span>(is_file($subFile))</span>
<span id="lnum19"> 19:</span><span> {</span>
<span id="lnum20"> 20:</span><span> unlink($subFile);</span>
<span id="lnum21"> 21:</span><span> }</span>
<span id="lnum22"> 22:</span><span> <span>if</span>(is_dir($subFile))</span>
<span id="lnum23"> 23:</span><span> {</span>
<span id="lnum24"> 24:</span><span> delDir($subFile);</span>
<span id="lnum25"> 25:</span><span> }</span>
<span id="lnum26"> 26:</span><span> }</span>
<span id="lnum27"> 27:</span><span> }</span>
<span id="lnum28"> 28:</span><span> closedir($dir_handle);</span>
<span id="lnum29"> 29:</span><span> rmdir($dirName);</span>
<span id="lnum30"> 30:</span><span> <span>return</span> $dirName.<span>'目录已经删除'</span>;</span>
<span id="lnum31"> 31:</span><span> }</span>
<span id="lnum32"> 32:</span><span> }</span>
<span id="lnum33"> 33:</span><span> }</span>
<span id="lnum34"> 34:</span><span> <span>/*传递test目录的副本test1*/</span></span>
<span id="lnum35"> 35:</span><span> <span>echo</span> delDir(<span>'./test1'</span>);</span>
删除成功的提示信息
4、复制目录
<span id="lnum1"> 1:</span><span> <span>/*</span></span>
<span id="lnum2"> 2:</span><span> <span>*复制目录</span></span>
<span id="lnum3"> 3:</span><span> <span>*@param string $dirSrc 原目录名</span></span>
<span id="lnum4"> 4:</span><span> <span>*@param string $dirTo 目标目录名</span></span>
<span id="lnum5"> 5:</span><span> <span>*/</span></span>
<span id="lnum6"> 6:</span> function copyDir($dirSrc,$dirTo)
<span id="lnum7"> 7:</span><span> {</span>
<span id="lnum8"> 8:</span><span> <span>if</span>(is_file($dirTo))</span>
<span id="lnum9"> 9:</span><span> {</span>
<span id="lnum10"> 10:</span><span> <span>echo</span> <span>'目标目录不能创建'</span>;<span>/*目标不是一个*/</span></span>
<span id="lnum11"> 11:</span><span> <span>return</span>;</span>
<span id="lnum12"> 12:</span><span> }</span>
<span id="lnum13"> 13:</span><span> <span>if</span>(!file_exists($dirTo))</span>
<span id="lnum14"> 14:</span> {
<span id="lnum15"> 15:</span><span> <span>/*目录不存在则创建*/</span></span>
<span id="lnum16"> 16:</span><span> mkdir($dirTo);</span>
<span id="lnum17"> 17:</span><span> }</span>
<span id="lnum18"> 18:</span><span> <span>if</span>($dir_handle = @opendir($dirSrc))</span>
<span id="lnum19"> 19:</span><span> {</span>
<span id="lnum20"> 20:</span><span> <span>while</span> ($fileName = readdir($dir_handle))</span>
<span id="lnum21"> 21:</span><span> {</span>
<span id="lnum22"> 22:</span><span> <span>/*排除两个特殊目录*/</span></span>
<span id="lnum23"> 23:</span><span> <span>if</span>($fileName != <span>'.'</span> && $fileName != <span>'..'</span>)</span>
<span id="lnum24"> 24:</span><span> {</span>
<span id="lnum25"> 25:</span><span> $subSrcFile = $dirSrc.<span>'/'</span>.$fileName;</span>
<span id="lnum26"> 26:</span><span> $subToFile = $dirTo.<span>'/'</span>.$fileName;</span>
<span id="lnum27"> 27:</span><span> <span>if</span>(is_file($subSrcFile))</span>
<span id="lnum28"> 28:</span><span> {</span>
<span id="lnum29"> 29:</span><span> copy($subSrcFile,$subToFile);</span>
<span id="lnum30"> 30:</span><span> }</span>
<span id="lnum31"> 31:</span><span> <span>if</span>(is_dir($subSrcFile))</span>
<span id="lnum32"> 32:</span><span> {</span>
<span id="lnum33"> 33:</span><span> copyDir($subSrcFile,$subToFile);</span>
<span id="lnum34"> 34:</span><span> }</span>
<span id="lnum35"> 35:</span><span> }</span>
<span id="lnum36"> 36:</span><span> }</span>
<span id="lnum37"> 37:</span><span> closedir($dir_handle);</span>
<span id="lnum38"> 38:</span><span> <span>return</span> $dirSrc.<span>'目录已经复制到'</span>.$dirTo.<span>'目录'</span>;</span>
<span id="lnum39"> 39:</span><span> }</span>
<span id="lnum40"> 40:</span><span> }</span>
<span id="lnum41"> 41:</span><span> <span>echo</span> copyDir(<span>'./test'</span>,<span>'../testcopy'</span>);</span>

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PHP 8.4 apporte plusieurs nouvelles fonctionnalités, améliorations de sécurité et de performances avec une bonne quantité de dépréciations et de suppressions de fonctionnalités. Ce guide explique comment installer PHP 8.4 ou mettre à niveau vers PHP 8.4 sur Ubuntu, Debian ou leurs dérivés. Bien qu'il soit possible de compiler PHP à partir des sources, son installation à partir d'un référentiel APT comme expliqué ci-dessous est souvent plus rapide et plus sécurisée car ces référentiels fourniront les dernières corrections de bogues et mises à jour de sécurité à l'avenir.

Si vous êtes un développeur PHP expérimenté, vous aurez peut-être le sentiment d'y être déjà allé et de l'avoir déjà fait. Vous avez développé un nombre important d'applications, débogué des millions de lignes de code et peaufiné de nombreux scripts pour réaliser des opérations.

Visual Studio Code, également connu sous le nom de VS Code, est un éditeur de code source gratuit – ou environnement de développement intégré (IDE) – disponible pour tous les principaux systèmes d'exploitation. Avec une large collection d'extensions pour de nombreux langages de programmation, VS Code peut être c

JWT est une norme ouverte basée sur JSON, utilisée pour transmettre en toute sécurité des informations entre les parties, principalement pour l'authentification de l'identité et l'échange d'informations. 1. JWT se compose de trois parties: en-tête, charge utile et signature. 2. Le principe de travail de JWT comprend trois étapes: la génération de JWT, la vérification de la charge utile JWT et l'analyse. 3. Lorsque vous utilisez JWT pour l'authentification en PHP, JWT peut être généré et vérifié, et les informations sur le rôle et l'autorisation des utilisateurs peuvent être incluses dans l'utilisation avancée. 4. Les erreurs courantes incluent une défaillance de vérification de signature, l'expiration des jetons et la charge utile surdimensionnée. Les compétences de débogage incluent l'utilisation des outils de débogage et de l'exploitation forestière. 5. L'optimisation des performances et les meilleures pratiques incluent l'utilisation des algorithmes de signature appropriés, la définition des périodes de validité raisonnablement,

Ce tutoriel montre comment traiter efficacement les documents XML à l'aide de PHP. XML (Language de balisage extensible) est un langage de balisage basé sur le texte polyvalent conçu à la fois pour la lisibilité humaine et l'analyse de la machine. Il est couramment utilisé pour le stockage de données et

Une chaîne est une séquence de caractères, y compris des lettres, des nombres et des symboles. Ce tutoriel apprendra à calculer le nombre de voyelles dans une chaîne donnée en PHP en utilisant différentes méthodes. Les voyelles en anglais sont a, e, i, o, u, et elles peuvent être en majuscules ou en minuscules. Qu'est-ce qu'une voyelle? Les voyelles sont des caractères alphabétiques qui représentent une prononciation spécifique. Il y a cinq voyelles en anglais, y compris les majuscules et les minuscules: a, e, i, o, u Exemple 1 Entrée: String = "TutorialSpoint" Sortie: 6 expliquer Les voyelles dans la chaîne "TutorialSpoint" sont u, o, i, a, o, i. Il y a 6 yuans au total

Liaison statique (statique: :) implémente la liaison statique tardive (LSB) dans PHP, permettant à des classes d'appel d'être référencées dans des contextes statiques plutôt que de définir des classes. 1) Le processus d'analyse est effectué au moment de l'exécution, 2) Recherchez la classe d'appel dans la relation de succession, 3) il peut apporter des frais généraux de performance.

Quelles sont les méthodes magiques de PHP? Les méthodes magiques de PHP incluent: 1. \ _ \ _ Construct, utilisé pour initialiser les objets; 2. \ _ \ _ Destruct, utilisé pour nettoyer les ressources; 3. \ _ \ _ Appel, gérer les appels de méthode inexistants; 4. \ _ \ _ GET, Implémentez l'accès à l'attribut dynamique; 5. \ _ \ _ SET, Implémentez les paramètres d'attribut dynamique. Ces méthodes sont automatiquement appelées dans certaines situations, améliorant la flexibilité et l'efficacité du code.
