wordpress中的函数
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wordpress中的部分函数分析如下：
/**
* 检查是否是一个序列化数据.
*
* If $data is not an string, then returned value will always be false.
* Serialized data is always a string.
*
* @since 2.0.5
*
* @param mixed $data Value to check to see if was serialized.
* @return bool False if not serialized and true if it was.
*/
function is_serialized( $data ) {
// if it isn't a string, it isn't serialized
if ( !is_string( $data ) )
return false;
$data = trim( $data );
if ( 'N;' == $data )
return true;
if ( !preg_match( '/^([adObis]):/', $data, $badions ) )
return false;
switch ( $badions[1] ) {
case 'a' :
case 'O' :
case 's' :
if ( preg_match( "/^{$badions[1]}:[0-9]+:.*[;}]\$/s", $data ) )
return true;
break;
case 'b' :
case 'i' :
case 'd' :
if ( preg_match( "/^{$badions[1]}:[0-9.E-]+;\$/", $data ) )
return true;
break;
}
return false;
}
/**
* 检查是否是一个字符串序列化数据
*
* @since 2.0.5
*
* @param mixed $data Serialized data
* @return bool False if not a serialized string, true if it is.
*/
function is_serialized_string( $data ) {
// if it isn't a string, it isn't a serialized string
if ( !is_string( $data ) )
return false;
$data = trim( $data );
if ( preg_match( '/^s:[0-9]+:.*;$/s', $data ) ) // this should fetch all serialized strings
return true;
return false;
}
/**
* http状态转换成说明
*
* @since 2.3.0
*
* @param int $code HTTP status code.
* @return string Empty string if not found, or description if found.
*/
function get_status_header_desc( $code ) {
global $wp_header_to_desc;
$code = absint( $code );
if ( !isset( $wp_header_to_desc ) ) {
$wp_header_to_desc = array(
100 => 'Continue',
101 => 'Switching Protocols',
200 => 'OK',
201 => 'Created',
202 => 'Accepted',
203 => 'Non-Authoritative Information',
204 => 'No Content',
205 => 'Reset Content',
206 => 'Partial Content',
300 => 'Multiple Choices',
301 => 'Moved Permanently',
302 => 'Found',
303 => 'See Other',
304 => 'Not Modified',
305 => 'Use Proxy',
307 => 'Temporary Redirect',
400 => 'Bad Request',
401 => 'Unauthorized',
403 => 'Forbidden',
404 => 'Not Found',
405 => 'Method Not Allowed',
406 => 'Not Acceptable',
407 => 'Proxy Authentication Required',
408 => 'Request Timeout',
409 => 'Conflict',
410 => 'Gone',
411 => 'Length Required',
412 => 'Precondition Failed',
413 => 'Request Entity Too Large',
414 => 'Request-URI Too Long',
415 => 'Unsupported Media Type',
416 => 'Requested Range Not Satisfiable',
417 => 'Expectation Failed',
500 => 'Internal Server Error',
501 => 'Not Implemented',
502 => 'Bad Gateway',
503 => 'Service Unavailable',
504 => 'Gateway Timeout',
505 => 'HTTP Version Not Supported'
);
}
if ( isset( $wp_header_to_desc[$code] ) )
return $wp_header_to_desc[$code];
else
return '';
}
/**
* 发送一个让页面不缓存的http头信息
*
* Different browsers support different nocache headers, so several headers must
* be sent so that all of them get the point that no caching should occur.
*
* @since 2.0.0
*/
function nocache_headers() {
// why are these @-silenced when other header calls aren't?
@header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' );
@header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT' );
@header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );
@header( 'Pragma: no-cache' );
}
/**
* 让javascript缓存10天的http头信息
*
* @since 2.1.0
*/
function cache_javascript_headers() {
$expiresOffset = 864000; // 10 days
header( "Content-Type: text/javascript; charset=" . get_bloginfo( 'charset' ) );
header( "Vary: Accept-Encoding" ); // Handle proxies
header( "Expires: " . gmdate( "D, d M Y H:i:s", time() + $expiresOffset ) . " GMT" );
}
/**
* 递归创建一个完整的目录(整个目录中的子目录不存在都创建)
*
* Will attempt to set permissions on folders.
*
* @since 2.0.1
*
* @param string $target Full path to attempt to create.
* @return bool Whether the path was created or not. True if path already exists.
*/
function wp_mkdir_p( $target ) {
// from php.net/mkdir user contributed notes
$target = str_replace( '//', '/', $target );
if ( file_exists( $target ) )
return @is_dir( $target );
// Attempting to create the directory may clutter up our display.
if ( @mkdir( $target ) ) {
$stat = @stat( dirname( $target ) );
$dir_perms = $stat['mode'] & 0007777; // Get the permission bits.
@chmod( $target, $dir_perms );
return true;
} elseif ( is_dir( dirname( $target ) ) ) {
return false;
}
// If the above failed, attempt to create the parent node, then try again.
if ( ( $target != '/' ) && ( wp_mkdir_p( dirname( $target ) ) ) )
return wp_mkdir_p( $target );
return false;
}
/**
* 检查是否是个绝对路径 ('/foo/bar', 'c:\windows').
*
* @since 2.5.0
*
* @param string $path File path
* @return bool True if path is absolute, false is not absolute.
*/
function path_is_absolute( $path ) {
// this is definitive if true but fails if $path does not exist or contains a symbolic link
if ( realpath($path) == $path )
return true;
if ( strlen($path) == 0 || $path{0} == '.' )
return false;
// windows allows absolute paths like this
if ( preg_match('#^[a-zA-Z]:\\\\#', $path) )
return true;
// a path starting with / or \ is absolute; anything else is relative
return (bool) preg_match('#^[/\\\\]#', $path);
}
/**
* 根据扩展名获得文件类型
*
* @package WordPress
* @since 2.5.0
* @uses apply_filters() Calls 'ext2type' hook on default supported types.
*
* @param string $ext The extension to search.
* @return string|null The file type, example: audio, video, document, spreadsheet, etc. Null if not found.
*/
function wp_ext2type( $ext ) {
$ext2type = apply_filters('ext2type', array(
'audio' => array('aac','ac3','aif','aiff','mp1','mp2','mp3','m3a','m4a','m4b','ogg','ram','wav','wma'),
'video' => array('asf','avi','divx','dv','mov','mpg','mpeg','mp4','mpv','ogm','qt','rm','vob','wmv'),
'document' => array('doc','docx','pages','odt','rtf','pdf'),
'spreadsheet' => array('xls','xlsx','numbers','ods'),
'interactive' => array('ppt','pptx','key','odp','swf'),
'text' => array('txt'),
'archive' => array('tar','bz2','gz','cab','dmg','rar','sea','sit','sqx','zip'),
'code' => array('css','html','php','js'),
));
foreach ( $ext2type as $type => $exts )
if ( in_array($ext, $exts) )
return $type;
}
/**
* 转换成正整数
*
* @since 2.5.0
*
* @param mixed $maybeint Data you wish to have convered to an absolute integer
* @return int An absolute integer
*/
function absint( $maybeint ) {
return abs( intval( $maybeint ) );
}
