search
Homephp教程php手册非常实用的PHP代码片段(重点推荐)

非常实用的PHP代码片段(重点推荐)

Jun 13, 2016 am 09:51 AM
phpcodeCanstudydeveloprecommendimproveefficiencyfragmentusenet

网上有很多 PHP 代码片段可以提高开发效率,也可以学习一下其中的技巧而应用在自己的项目中,下面 我爱水煮鱼 就精选了几个比较有用的 PHP 片段。

从网页中提取关键词

从指定页面中提取关键词并显示出来。

 代码如下 复制代码

$meta = get_meta_tags('http://www.bKjia.c0m/');
$keywords = $meta['keywords'];
// 分割关键词
$keywords = explode(',', $keywords );
// 整理
$keywords = array_map( 'trim', $keywords );
// 去掉空内容
$keywords = array_filter( $keywords );

print_r( $keywords );

得到页面中所有的链接
下面代码可以使用 PHP DOM 获取指定页面中的所有链接,仅作抛砖引玉,具体使用自由发挥。

 代码如下 复制代码

$html = file_get_contents('http://www.hzhuti.com');

$dom = new DOMDocument();
@$dom->loadHTML($html);

$xpath = new DOMXPath($dom);
$hrefs = $xpath->evaluate("/html/body//a");

for ($i = 0; $i length; $i++) {
       $href = $hrefs->item($i);
       $url = $href->getAttribute('href');
       echo $url.'
';
}

自动把页面中的 URL 转换成可点击的超链接
如果你发表一些文章或者做一些页面,要想放上一个超链接,必须编写一个 a 标签。使用下面这段代码可以方便的将 URL 转换成超链接输出。实现方法比较简单,大体思路就是用正则匹配出来 URL 然后处理输出超链接。

 代码如下 复制代码

function _make_url_clickable_cb($matches) {
 $ret = '';
 $url = $matches[2];
 
 if ( empty($url) )
  return $matches[0];
 // 去掉 URL 后面的标点符号
 if ( in_array(substr($url, -1), array('.', ',', ';', ':')) === true ) {
  $ret = substr($url, -1);
  $url = substr($url, 0, strlen($url)-1);
 }
 return $matches[1] . "$url" . $ret;
}
 
function _make_web_ftp_clickable_cb($matches) {
 $ret = '';
 $dest = $matches[2];
 $dest = 'http://' . $dest;
 
 if ( empty($dest) )
  return $matches[0];
 if ( in_array(substr($dest, -1), array('.', ',', ';', ':')) === true ) {
  $ret = substr($dest, -1);
  $dest = substr($dest, 0, strlen($dest)-1);
 }
 return $matches[1] . "$dest" . $ret;
}
 
function _make_email_clickable_cb($matches) {
 $email = $matches[2] . '@' . $matches[3];
 return $matches[1] . "$email";
}
 
function make_clickable($ret) {
 $ret = ' ' . $ret;
 $ret = preg_replace_callback('#([s>])([w]+?://[w\x80-\xff#$%&~/.-;:=,?@[]+]*)#is', '_make_url_clickable_cb', $ret);
 $ret = preg_replace_callback('#([s>])((www|ftp).[w\x80-\xff#$%&~/.-;:=,?@[]+]*)#is', '_make_web_ftp_clickable_cb', $ret);
 $ret = preg_replace_callback('#([s>])([.0-9a-z_+-]+)@(([0-9a-z-]+.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret);
 
 $ret = preg_replace("#(]+?>|>))]+?>([^>]+?)#i", "$1$3", $ret);
 $ret = trim($ret);
 return $ret;
}

用 PHP 生成 Data URI 代码
通常把图片编码成 Data URI 格式用在网页中来减少 HTTP 请求来提升前端性能。同时还有一些其他的用途。下面代码可以将文件编码成 Data URI。

 代码如下 复制代码

function data_uri($file, $mime) {
  $contents=file_get_contents($file);
  $base64=base64_encode($contents);
  echo "data:$mime;base64,$base64";
}

将远程图片下载到本地服务器
特别是转载文章等,为了防止对方网站关掉而导致图片丢失,通常会在发表文章的时候,将远程服务器上的图片下载到本地服务器上。下面代码简单的实现了这个需求,更多的储存位置、遍历链接还需要你自己自定义:

 代码如下 复制代码
$image = file_get_contents('http://www.bKjia.c0m/logo.gif');
file_put_contents('/images/logo.gif', $image);

去掉文中的无用标签
当从一些文本编辑器(例如 Word)中将文本复制到网页编辑器中时,可能会有一些额外的无用标签,例如一些指定文字样式的 style 等。下面代码可以通过正则匹配来去掉这些无用标签,净化文本:

 代码如下 复制代码

function cleanHTML($html) {

// 首先去掉无用的标签(可以自定义更多需要清除的标签)

$html = ereg_replace("]*>","",$html);

// 然后再运行两遍去掉无用属性

$html = ereg_replace("]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","",$html);
$html = ereg_replace("]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","",$html);

return $html
}

如果你也收藏了一些有用的 PHP 代码

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

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 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.

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools