几个简单又实用的PHP函数

简单方便使用：

/** * 将多维数组转为一维数组 * @param array $arr * @return array */function ArrMd2Ud($arr) { ???#将数值第一元素作为容器，作地址赋值。 ???$ar_room = &$arr[key($arr)]; ???#第一容器不是数组进去转呀 ???if (!is_array($ar_room)) { ???????#转为成数组 ???????$ar_room = array($ar_room); ???} ???#指针下移 ???next($arr); ???#遍历 ???while (list($k, $v) = each($arr)) { ???????#是数组就递归深挖，不是就转成数组 ???????$v = is_array($v) ? call_user_func(__FUNCTION__, $v) : array($v); ???????#递归合并 ???????$ar_room = array_merge_recursive($ar_room, $v); ???????#释放当前下标的数组元素 ???????unset($arr[$k]); ???} ???return $ar_room;}

/** * 日期转换成几分钟前 */public function formatTime($date) { ???$timer = strtotime($date); ???$diff = $_SERVER[‘REQUEST_TIME‘] - $timer; ???$day = floor($diff / 86400); ???$free = $diff % 86400; ???if($day > 0) { ???????if(15 < $day && $day <30){ ???????????return "半个月前"; ???????}elseif(30 <= $day && $day <90){ ???????????return "1个月前"; ???????}elseif(90 <= $day && $day <187){ ???????????return "3个月前"; ???????}elseif(187 <= $day && $day <365){ ???????????return "半年前"; ???????}elseif(365 <= $day){ ???????????return "1年前"; ???????}else{ ???????????return $day."天前"; ???????} ???}else{ ???????if($free>0){ ???????????$hour = floor($free / 3600); ???????????$free = $free % 3600; ???????????if($hour>0){ ???????????????return $hour."小时前"; ???????????}else{ ???????????????if($free>0){ ???????????????????$min = floor($free / 60); ???????????????????$free = $free % 60; ???????????????if($min>0){ ???????????????????return $min."分钟前"; ???????????????}else{ ???????????????????if($free>0){ ???????????????????????return $free."秒前"; ???????????????????}else{ ???????????????????????return ‘刚刚‘; ???????????????????} ???????????????} ???????????????}else{ ???????????????????return ‘刚刚‘; ???????????????} ???????????} ???????}else{ ???????????return ‘刚刚‘; ???????} ???}}

/** * 截取长度 */public function getSubString($rawString,$length=‘100‘,$etc = ‘...‘,$isStripTag=true){ ???$rawString = str_replace(‘_baidu_page_break_tag_‘, ‘‘, $rawString); ???$result = ‘‘; ???if($isStripTag) ???????$string = html_entity_decode(trim(strip_tags($rawString)), ENT_QUOTES, ‘UTF-8‘); ???else ???????$string = trim($rawString); ???$strlen = strlen($string); ???for ($i = 0; (($i < $strlen) && ($length > 0)); $i++){ ???????if ($number = strpos(str_pad(decbin(ord(substr($string, $i, 1))), 8, ‘0‘, STR_PAD_LEFT), ‘0‘)) ???????{ ???????????if ($length < 1.0){ ???????????????break; ???????????} ???????????$result .= substr($string, $i, $number); ???????????$length -= 1.0; ???????????$i += $number - 1; ???????}else{ ???????????$result .= substr($string, $i, 1); ???????????$length -= 0.5; ???????} ???} ???if($isStripTag) ???????$result = htmlspecialchars($result, ENT_QUOTES, ‘UTF-8‘); ????????????if ($i < $strlen){ ???????$result .= $etc; ???} ???return $result;}

/* * ************************* * 生成随机字符串，可以自己扩展 ??//若想唯一，只需在开头加上用户id * $type可以为：upper(只生成大写字母)，lower(只生成小写字母)，number(只生成数字) * $len为长度，定义字符串长度 * mark 2017/8/15 * ************************** */ function _random($type, $len = 0) { ???$new = ‘‘; ???$string = ‘0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ‘; ?//数据池 ???if ($type == ‘upper‘) { ???????for ($i = 0; $i < $len; $i++) { ???????????$new .= $string[mt_rand(36, 61)]; ???????} ???????return $new; ???} ???if ($type == ‘lower‘) { ???????for ($i = 0; $i < $len; $i++) { ???????????$new .= $string[mt_rand(10, 35)]; ???????} ???????return $new; ???} ???if ($type == ‘number‘) { ???????for ($i = 0; $i < $len; $i++) { ???????????$new .= $string[mt_rand(0, 9)]; ???????} ???????return $new; ???}}

//计算该月有几天function getdaysInmonth($month, $year) { ???$days = ‘‘; ???if ($month == 1 || $month == 3 || $month == 5 || $month == 7 || $month == 8 || $month == 10 || $month == 12) ???????$days = 31; ???else if ($month == 4 || $month == 6 || $month == 9 || $month == 11) ???????$days = 30; ???else if ($month == 2) { ???????if (isLeapyear($year)) { ???????????$days = 29; ???????} else { ???????????$days = 28; ???????} ???} ???return ($days);} //判断是否为润年function isLeapyear($year) { ???if ((($year % 4) == 0) && (($year % 100) != 0) || (($year % 400) == 0)) { ???????return (true); ???} else { ???????return (false); ???}}

//生成订单15位function auto_order($ord = 0) { ???//自动生成订单号 ?传入参数为0 或者1 ??0为本地 ?1为线上订单 ???if ($ord == 0) { ???????$str = ‘00‘ . time() . rand(1000, 9999); //00 本地订单 ???} else { ???????$str = ‘99‘ . time() . rand(1000, 9999); ?//11 线上订单 ???} ???return $str;} //生成订单15位function auto_new_order($ord = 0) { ???srand(time()); ???//自动生成订单号 ?传入参数为0 或者1 ??0为本地 ?1为线上订单 ???if ($ord == 0) { ???????$str = ‘00‘ . time() . mt_rand(100000,999999); //00 本地订单 ???} else { ???????$str = ‘11‘ . time() . mt_rand(100000,999999); ?//11 线上订单 ???} ???return $str;}

/** * 检测是否为UTF8编码 ?* @param $string 检测字符串 * @return bool */function is_utf8($string) { ???return preg_match(‘%^(?: ?????????[\x09\x0A\x0D\x20-\x7E] ???????????# ASCII ???????| [\xC2-\xDF][\x80-\xBF] ????????????# non-overlong 2-byte ???????| ?\xE0[\xA0-\xBF][\x80-\xBF] ???????# excluding overlongs ???????| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} ?# straight 3-byte ???????| ?\xED[\x80-\x9F][\x80-\xBF] ???????# excluding surrogates ???????| ?\xF0[\x90-\xBF][\x80-\xBF]{2} ????# planes 1-3 ???????| [\xF1-\xF3][\x80-\xBF]{3} ?????????# planes 4-15 ???????| ?\xF4[\x80-\x8F][\x80-\xBF]{2} ????# plane 16 ???)*$%xs‘, $string);}

//处理json字符中的特殊字符function getJsonToArr($result,$return_array=true){ ???????$tempArr = NULL; ???????$result = preg_replace(‘/([^\\\])(":)(\d{9,})(,")/i‘, ‘${1}${2}"${3}"${4}‘, $result); //taobao bug,number >2^32 ???????$tempArr = json_decode($result, $return_array); ???????if ($tempArr == NULL) { ???????????$patterns = array(‘/,+\s*\}/‘, ‘/,+\s*\]/‘, ‘/"\s+|\s+"/‘, ‘/\n|\r|\t/‘,‘/\\\/‘,‘/ss+/‘); ???????????$replacements = array(‘}‘, ‘]‘, ‘"‘, ‘ ‘,‘‘,‘ ‘); ???????????$result = preg_replace($patterns, $replacements, $result); ?????????????????????$tempArr = json_decode($result, $return_array); ???????} ????????return $tempArr;} ?//非法字符过滤函数function has_unsafeword($str) { ???$regex = "/\/|\~|\!|\@|\#|\\$|\%|\^|\&|\*|\(|\)|\_|\+|\{|\}|\:|\<|\>|\?|\[|\]|\.|\/|\;|\‘|\`|\=|\\\|\|/"; ???return preg_replace($regex,"",$str); ??} //去空格，以及字符添加斜杠function _trim(&$value) { ???Return addslashes(trim($value));}