非常实用的PHP代码片段(重点推荐)_PHP教程

$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 );

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

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;
}

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

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）

$html = ereg_replace("<(/)?(font|span|del|ins)[^>]*>","",$html);

// 然后再运行两遍去掉无用属性

$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","<1>",$html);
$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","<1>",$html);

return $html
}