11个php日常用的小tips 代码片段

liyao20060101

http://www.phpzag.com/11-useful-code-snippets-for-php-developers/
简单小结下

1 用php的内置csv函数可以很方便生成CSV了，
  
function generateCsv($data, $delimiter = ',', $enclosure = '"') {
$handle = fopen('php://temp', 'r+');
foreach ($data as $line) {
fputcsv($handle, $line, $delimiter, $enclosure);
}
rewind($handle);
while (!feof($handle)) {
$contents .= fread($handle, 8192);
}
fclose($handle);
return $contents;
}

使用方法：

$data = array( array(1, 2, 4), array('test string', 'test, literal, comma', 'test literal "quotes"'), );
echo generateCsv($data);


2 过滤非法输入
  
<?php
function sanitize_input_data($input_data) {
$input_data = trim(htmlentities(strip_tags($input_data,“,”)));
if (get_magic_quotes_gpc())
$input_data = stripslashes($input_data);
.$input_data = mysql_real_escape_string($input_data);
return $input_data;
}
?>


使用：

<?php
$bad_string = “Hi! <script src=’http://www.evilssite.com/bad_script.js’></script> It’s a good day!”;
$good_string = sanitize_input_data($bad_string);
//OUTPUT:: Hi! It\’s a good day!
?>


3 unzip文件
  php内置了unzip

function unzip_file($file, $destination){
// create object
$zip = new ZipArchive() ;
// open archive
if ($zip->open($file) !== TRUE) {
die (’Could not open archive’);
}
// extract contents to destination directory
$zip->extractTo($destination);
// close archive
$zip->close();
echo 'Archive extracted to directory';
}


4 使用 get_meta_tags获取某个网页的meta关键字
   
$meta = get_meta_tags('http://www.emoticode.net/');
$keywords = $meta['keywords'];
// Split keywords
$keywords = explode(',', $keywords );
// Trim them
$keywords = array_map( 'trim', $keywords );
// Remove empty values
$keywords = array_filter( $keywords );
print_r( $keywords );


5 判断服务器是否https
  
if ($_SERVER['HTTPS'] != "on") {
echo "This is not HTTPS";
}else{
echo "This is HTTPS";
}


6
显示某个网页的所有源代码
   
$lines = file('http://google.com/');
foreach ($lines as $line_num => $line) {
// loop thru each line and prepend line numbers
echo "Line #{$line_num} : " . htmlspecialchars($line) . "
\n";
}


7 使用datauri是很方便把图片等搞成base64的，代码如下：
  
function data_uri($file, $mime) {
$contents=file_get_contents($file);
$base64=base64_encode($contents);
echo "data:$mime;base64,$base64";
}


8 获得某个网页的所有连接

$html = file_get_contents('http://www.example.com');
$dom = new DOMDocument();
@$dom->loadHTML($html);
// grab all the on the page
$xpath = new DOMXPath($dom);
$hrefs = $xpath->evaluate("/html/body//a");
for ($i = 0; $i < $hrefs->length; $i++) {
$href = $hrefs->item($i);
$url = $href->getAttribute('href');
echo $url.'
';
}


9
让页面的题目变得对于SEO来说更友善 ，

function make_seo_name($title) {
return preg_replace('/[^a-z0-9_-]/i', '', strtolower(str_replace(' ', '-', trim($title))));
}


比如有个标题：
"This foo's bar is rockin' cool!";
则输出为：
this-foos-bar-is-rockin-cool
10
下载某个网页上的图片再放到自己的服务器中
  
$image = file_get_contents('http://www.url.com/image.jpg');
file_put_contents('/images/image.jpg', $image);


11 页面上显示自己facebook的好友数目（对国人来说没啥用）

function fb_fan_count($facebook_name){
$data = json_decode(file_get_contents("https://graph.facebook.com/".$facebook_name));
echo $data->likes;
}