2020630_php常用函数总结

php获取毫秒函数

代码如下

// A code block
 /* 
    *返回字符串的毫秒数时间戳 
    */  
    function _get_total_millisecond()  
    {  
		$time = explode (" ", microtime () );   
		$time = $time [1] . ($time [0] * 1000);   
		$time2 = explode ( ".", $time );   
		$time = $time2 [0];  
		return $time;  
    }

判断是否是https请求代码如下

function is_https() {
		if ( !empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off') {
			return true;
		} elseif ( isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https' ) {
			return true;
		} elseif ( !empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off') {
			return true;
		}
		return false;
	}

获取请求连接url

function get_url() {
    $sys_protocal ='https://';
    $php_self = $_SERVER['PHP_SELF'] ? $_SERVER['PHP_SELF'] : $_SERVER['SCRIPT_NAME'];
    $path_info = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '';
    $relate_url = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : $php_self.(isset($_SERVER['QUERY_STRING']) ? '?'.$_SERVER['QUERY_STRING'] : $path_info);
    return $sys_protocal.(isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '').$relate_url;
}

时间戳格式化

/**
 * 时间戳格式化
 * @param int $time
 * @return string 完整的时间显示
 * @author huajie <banhuajie@163.com>
 */
function time_format($time = NULL, $format = 'Y-m-d H:i') {
	$time = $time === NULL ? time() : intval($time);
	return date($format, $time);
}

对查询结果进行排序

/**
 * 对查询结果集进行排序
 * @access public
 * @param array $list 查询结果
 * @param string $field 排序的字段名
 * @param array $sortby 排序类型
 * asc正向排序 desc逆向排序 nat自然排序
 * @return array
 */
function list_sort_by($list, $field, $sortby = 'asc') {
	if (is_array($list)) {
		$refer = $resultSet = array();
		foreach ($list as $i => $data) {
			$refer[$i] = &$data[$field];
		}
		switch ($sortby) {
		case 'asc': // 正向排序
			asort($refer);
			break;
		case 'desc': // 逆向排序
			arsort($refer);
			break;
		case 'nat': // 自然排序
			natcasesort($refer);
			break;
		}
		foreach ($refer as $key => $val) {
			$resultSet[] = &$list[$key];
		}

		return $resultSet;
	}
	return false;
}

把返回的数据集转换成Tree

/**
 * 把返回的数据集转换成Tree
 * @param array $list 要转换的数据集
 * @param string $pid parent标记字段
 * @param string $level level标记字段
 * @return array
 */
function list_to_tree($list, $pk = 'id', $pid = 'pid', $child = '_child', $root = 0) {
	// 创建Tree
	$tree = array();
	if (is_array($list) && !is_object($list)) {
		// 创建基于主键的数组引用
		$refer = array();
		foreach ($list as $key => $data) {
			$refer[$data[$pk]] = &$list[$key];
		}
		foreach ($list as $key => $data) {
			// 判断是否存在parent
			$parentId = $data[$pid];
			if ($root == $parentId) {
				$tree[] = &$list[$key];
			} else {
				if (isset($refer[$parentId])) {
					$parent             = &$refer[$parentId];
					$parent['childs'][] = $data['id'];
					$parent[$child][]   = &$list[$key];
				}
			}
		}
	}
	return $tree;
}

存储（流量）单位换算

/**
 * 格式化字节大小
 * @param  number $size      字节数
 * @param  string $delimiter 数字和单位分隔符
 * @return string            格式化后的带单位的大小
 */
function format_bytes($size, $delimiter = '') {
	$units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');
	for ($i = 0; $size >= 1024 && $i < 5; $i++) {
		$size /= 1024;
	}
	return round($size, 2) . $delimiter . $units[$i];
}

php获取中文字符拼音首字母

//php获取中文字符拼音首字母
function getFirstCharter($s0) {
	$fchar = ord($s0{0});
	if ($fchar >= ord("A") and $fchar <= ord("z")) {
		return strtoupper($s0{0});
	}

	$s1 = \iconv("UTF-8", "gb2312", $s0);
	$s2 = \iconv("gb2312", "UTF-8", $s1);
	if ($s2 == $s0) {$s = $s1;} else { $s = $s0;}
	$asc = ord($s{0}) * 256 + ord($s{1}) - 65536;
	if ($asc >= -20319 and $asc <= -20284) {
		return "A";
	}

	if ($asc >= -20283 and $asc <= -19776) {
		return "B";
	}

	if ($asc >= -19775 and $asc <= -19219) {
		return "C";
	}

	if ($asc >= -19218 and $asc <= -18711) {
		return "D";
	}

	if ($asc >= -18710 and $asc <= -18527) {
		return "E";
	}

	if ($asc >= -18526 and $asc <= -18240) {
		return "F";
	}

	if ($asc >= -18239 and $asc <= -17923) {
		return "G";
	}

	if ($asc >= -17922 and $asc <= -17418) {
		return "H";
	}

	if ($asc >= -17417 and $asc <= -16475) {
		return "J";
	}

	if ($asc >= -16474 and $asc <= -16213) {
		return "K";
	}

	if ($asc >= -16212 and $asc <= -15641) {
		return "L";
	}

	if ($asc >= -15640 and $asc <= -15166) {
		return "M";
	}

	if ($asc >= -15165 and $asc <= -14923) {
		return "N";
	}

	if ($asc >= -14922 and $asc <= -14915) {
		return "O";
	}

	if ($asc >= -14914 and $asc <= -14631) {
		return "P";
	}

	if ($asc >= -14630 and $asc <= -14150) {
		return "Q";
	}

	if ($asc >= -14149 and $asc <= -14091) {
		return "R";
	}

	if ($asc >= -14090 and $asc <= -13319) {
		return "S";
	}

	if ($asc >= -13318 and $asc <= -12839) {
		return "T";
	}

	if ($asc >= -12838 and $asc <= -12557) {
		return "W";

	}

	if ($asc >= -12556 and $asc <= -11848) {
		return "X";
	}

	if ($asc >= -11847 and $asc <= -11056) {
		return "Y";
	}

	if ($asc >= -11055 and $asc <= -10247) {
		return "Z";
	}

	return null;
}

function PyFirst($zh) {
	$ret = "";
	$s1  = \iconv("UTF-8", "gb2312", $zh);
	$s2  = \iconv("gb2312", "UTF-8", $s1);
	if ($s2 == $zh) {$zh = $s1;}
	for ($i = 0; $i < strlen($zh); $i++) {
		$s1 = substr($zh, $i, 1);
		$p  = ord($s1);
		if ($p > 160) {
			$s2 = substr($zh, $i++, 2);
			$ret .= getFirstCharter($s2);
		} else {
			$ret .= $s1;
		}
	}
	return $ret;
}