11个php日常用的小tips 代码片段

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;
}