一些常用的PHP函数(整理)

/**
 * 邹颢
 * [email protected]
 */

/**
 * 获取当前毫秒
 * @return string
 */
function get_millisecond() {
	$t = explode ( " ", microtime () );
	$t = $t [1] . ($t [0] * 1000);
	$t2 = explode ( ".", $t );
	return $t2 [0];
}
/**
 * curl模拟http/https post请求
 * @param string $url			请求网址
 * @param array $data			请求参数
 * @return string				网址内容
 */
function curl_post($url,$data=array()){
	$ch = curl_init($url);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER,true) ; // 获取数据返回
	curl_setopt($ch, CURLOPT_POST,true) ; // 启用时会发送一个常规的POST请求，类型为：application/x-www-form-urlencoded，就像表单提交的一样。
	curl_setopt($ch, CURLOPT_POSTFIELDS,$data); // 在HTTP中的“POST”操作。如果要传送一个文件，需要一个@开头的文件名
	if(substr($url,0,5)=='https'){
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
	}
	$content=curl_exec($ch);
	curl_close($ch) ;
	return $content;
}
/**
 * curl模拟http get请求
 * @param string $url			请求网址
 * @param string|array $data	请求参数
 * @return string				网址内容
 */
function curl_get($url,$data=array()){
	$url=rtrim($url,'/');
	if(!empty($data)){
		if(is_array($data)){
			$first=true;
			foreach($data as $k=>$v){
				if($first){
					$url.='?';
					$first=false;
				}else{
					$url.='&';
				}
				$url.="{$k}={$v}";
			}
		}else{
			$data=ltrim('?',$data);
			$url.='?'.$data;
		}
	}
	$ch = curl_init($url);
	curl_setopt($ch,CURLOPT_HEADER,false);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true) ; // 获取数据返回
	if(substr($url,0,5)=='https'){
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
	}
	$content = curl_exec($ch);
	curl_close($ch);
	return $content;
}
/**
 * 二维数组按键值排序
 * @param array $arr 		二维数组
 * @param string $keys		键值
 * @param string $type		升序:asc,降序:desc(else)
 * @return array
 */
function array_sort($arr,$keys,$type='asc'){
	$keysvalue = $new_array = array();
	foreach ($arr as $k=>$v){
		$keysvalue[$k] = $v[$keys];
	}
	if($type == 'asc'){
		asort($keysvalue);
	}else{
		arsort($keysvalue);
	}
	reset($keysvalue);
	foreach ($keysvalue as $k=>$v){
		$new_array[$k] = $arr[$k];
	}
	return $new_array;
}
/**
 * 获取客户端ip
 * @param number $type
 * @return string
 */
function get_client_ip($type = 0) {
	$type       =  $type ? 1 : 0;
	static $ip  =   NULL;
	if ($ip !== NULL) return $ip[$type];
	if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
		$arr    =   explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
		$pos    =   array_search('unknown',$arr);
		if(false !== $pos) unset($arr[$pos]);
		$ip     =   trim($arr[0]);
	}elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
		$ip     =   $_SERVER['HTTP_CLIENT_IP'];
	}elseif (isset($_SERVER['REMOTE_ADDR'])) {
		$ip     =   $_SERVER['REMOTE_ADDR'];
	}
	// IP地址合法验证
	$long = sprintf("%u",ip2long($ip));
	$ip   = $long ? array($ip, $long) : array('0.0.0.0', 0);
	return $ip[$type];
}
/**
 * 将字符串转换为驼峰式命名
 * 
 * @param string $str        	
 * @param boolean $big
 *        	true大驼峰式 false小驼峰式
 * @return string
 */
function hump_type($str, $big = false) {
	$str = strtolower ( $str );
	$big and ucfirst ( $str );
	$str = preg_replace ( "/_([a-zA-Z])/e", "strtoupper('\\1')", $str );
	return $str;
}

/**
 * 遍历删除文件夹
 *
 * @param string $path
 *        	文件夹地址
 * @return boolean
 */
function delete_files($path) {
	if (is_file ( $path )) {
		return unlink ( $path );
	}
	if (is_dir ( $path )) {
		$handle = opendir ( $path );
		if ($handle != false) {
			while ( false !== ($file = readdir ( $handle )) ) {
				if (in_array ( $file, array (
						'.',
						'..' 
				) ))
					continue;
				$file = $path . '/' . $file;
				if (is_dir ( $file )) {
					delete_files ( $file );
				} else if (is_file ( $file )) {
					if (unlink ( $file ) == false)
						return false;
				}
			}
			closedir ( $handle );
		}
		return true;
	}
}
/**
 * 截取字符串(可截取utf8的)
 *
 * @param string $str        	
 * @param int $start        	
 * @param int $length        	
 * @param string $trim        	
 * @param string $charset        	
 * @return string
 */
function sub($str, $start, $length, $trim = "...", $charset = 'UTF-8') {
	$length+=2;
	if (function_exists ( 'mb_get_info' )) {
		$iLength = mb_strlen ( $str, $charset );
		$str = mb_substr ( $str, $start, $length, $charset );
		if($length< $iLength - $start){
			$length-=2;
			return mb_substr ( $str, $start, $length, $charset ).$trim;
		}else{
			return $str;
		}
	} else {
		preg_match_all ( "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/", $str, $info );
		$str = join ( "", array_slice ( $info [0], $start, $length ) );
		return ($length < (sizeof ( $info [0] ) - $start)) ? $str . $trim : $str;
	}
}
/**
 * 游览器友好输出
 * 无线参数
 */
function dump() {
	$data=func_get_args();
	ob_start ();
	foreach($data as $v){
		var_dump ( $v );
	}
	$output = ob_get_clean ();
	if (! extension_loaded ( 'xdebug' )) {
		$output = preg_replace ( '/\]\=\>\n(\s+)/m', '] => ', $output );
		$output = '<pre>' . htmlspecialchars ( $output, ENT_QUOTES ) . '</pre>';
	}
	echo ($output);
}
/**
 * 从左边查询子串,找到则删除子串,只删除一次
 *
 * @param string $str        	
 * @param string $find        	
 * @return string
 */
function substr_left_once($str, $find) {
	$start = strpos ( $str, $find );
	if (is_bool ( $start )) {
		return $str;
	} else {
		return substr ( $str, $start + strlen ( $find ), strlen ( $str ) );
	}
}
/**
 * 从右边查询子串,找到则删除子串,只删除一次
 *
 * @param string $str        	
 * @param string $find        	
 * @return string
 */
function substr_right_once($str, $find) {
	$end = strrpos ( $str, $find );
	if (is_bool ( $end )) {
		return $str;
	} else {
		return substr ( $str, 0, $end );
	}
}

一些常用的PHP函数(整理),古老的榕树,5-wow.com