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3.3. Function

3.3.1. 列出所有function

		
<?php

$extensions = get_loaded_extensions();
foreach($extensions as $each_ext)
{
	echo "\t<keyword>$each_ext, ";
	$ext_funcs = get_extension_funcs($each_ext);
	foreach($ext_funcs as $func)
	{
	   echo "$func, ";
	}
	echo "</keyword>\r\n";
}
?>
		
		

3.3.2.  php.ini

3.3.2.1. ini_set

@ini_set('memory_limit',          '16M');
			

3.3.2.2. ini_get

			
<?php
  echo ini_get('short_open_tag');
?>
			
			

3.3.3. PHP Option

include_path

		
<?php
$path = '/usr/lib/pear';
set_include_path(get_include_path() . PATH_SEPARATOR . $path);
?>
		
		

3.3.4. 操作系統類型

php_uname();
PHP_OS
DIRECTORY_SEPARATOR
PHP_SHLIB_SUFFIX
PATH_SEPARATOR

for example:
if(PATH_SEPARATOR==':'){
	echo 'Linux';
}else{
	else echo 'Windows';
}

		

3.3.5. 日期比較

		
if(strftime('%Y-%m-%d',strtotime('2009-04-19')) <= date('Y-m-d')){
	to-do ...
}
		
		

3.3.6. rand()

if(rand(0,99)>50){

}else{

}
		

生成隨機IP地址

		
<?php
$min=1;
$min=254;
$ipaddr = rand($min,$max).'.'.rand($min,$max).'.'.rand($min,$max).'.'.rand($min,$max);
//$ipaddr = '111.'.rand($min,$max).'.'.rand($min,$max).'.'.rand($min,$max);
echo $ipaddr;
		
		

3.3.7. header

		
// See related links for more status codes

// Use this header instruction to fix 404 headers
// produced by url rewriting...
header('HTTP/1.1 200 OK');

// Page was not found:
header('HTTP/1.1 404 Not Found');

// Access forbidden:
header('HTTP/1.1 403 Forbidden');

// The page moved permanently should be used for
// all redrictions, because search engines know
// what's going on and can easily update their urls.
header('HTTP/1.1 301 Moved Permanently');

// Server error
header('HTTP/1.1 500 Internal Server Error');

// Redirect to a new location:
header('Location: http://www.example.org/');

// Redriect with a delay:
header('Refresh: 10; url=http://www.example.org/');
print 'You will be redirected in 10 seconds';

// you can also use the HTML syntax:
// <meta http-equiv="refresh" content="10;http://www.example.org/ />

// override X-Powered-By value
header('X-Powered-By: PHP/4.4.0');
header('X-Powered-By: Brain/0.6b');

// content language (en = English)
header('Content-language: en');

// last modified (good for caching)
$time = time() - 60; // or filemtime($fn), etc
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $time).' GMT');

// header for telling the browser that the content
// did not get changed
header('HTTP/1.1 304 Not Modified');

// set content length (good for caching):
header('Content-Length: 1234');

// Headers for an download:
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="example.zip"');
header('Content-Transfer-Encoding: binary');
// load the file to send:
readfile('example.zip');

// Disable caching of the current document:
header('Cache-Control: no-cache, no-store, max-age=0, must-revalidate');
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past
header('Pragma: no-cache');

// set content type:
header('Content-Type: text/html; charset=iso-8859-1');
header('Content-Type: text/html; charset=utf-8');
header('Content-Type: text/plain'); // plain text file
header('Content-Type: image/jpeg'); // JPG picture
header('Content-Type: application/zip'); // ZIP file
header('Content-Type: application/pdf'); // PDF file
header('Content-Type: audio/mpeg'); // Audio MPEG (MP3,...) file
header('Content-Type: application/x-shockwave-flash'); // Flash animation

// show sign in box
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Basic realm="Top Secret"');
print 'Text that will be displayed if the user hits cancel or ';
print 'enters wrong login data';
		
		
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