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PHP实用代码片断

发布时间：2020-12-13 17:33:42 所属栏目：PHP教程 来源：网络整理
导读：几个简单又实用的PHP函数 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 /* * ************************* ? * 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)

几个简单又实用的PHP函数


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/* * *************************
? * 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 ;
???? }
}
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//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);
???? }
}
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//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 ;
}
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/**
? * 检测是否为UTF8编码
? * @param $string 检测字符串
? * @return bool
? */
function is_utf8( $string ) {
???? return preg_match(‘%^(?:
?????????? [x09x0Ax0Dx20-x7E]??????????? # ASCII
???????? | [xC2-xDF][x80-xBF]???????????? # non-overlong 2-byte
???????? |? xE0[xA0-xBF][x80-xBF]??????? # excluding overlongs
???????? | [xE1-xECxEExEF][x80-xBF]{2}? # straight 3-byte
???????? |? xED[x80-x9F][x80-xBF]??????? # excluding surrogates
???????? |? xF0[x90-xBF][x80-xBF]{2}???? # planes 1-3
???????? | [xF1-xF3][x80-xBF]{3}????????? # planes 4-15
???????? |? xF4[x80-x8F][x80-xBF]{2}???? # plane 16
???? )*$%xs‘, $string );
}
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//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 ));
}
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/**
? * 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 ;
}
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/**
? * 判断是PC端还是wap端访问
? * @return type判断手机移动设备访问
? */
function isMobile()
{
???? // 如果有HTTP_X_WAP_PROFILE则一定是移动设备
???? if (isset ( $_SERVER [ ‘HTTP_X_WAP_PROFILE‘ ]))
???? {
???????? return true;
???? }
???? // 如果via信息含有wap则一定是移动设备,部分服务商会屏蔽该信息
???? if (isset ( $_SERVER [ ‘HTTP_VIA‘ ]))
???? {
???????? // 找不到为flase,否则为true
???????? return stristr ( $_SERVER [ ‘HTTP_VIA‘ ], "wap" ) ? true : false;
???? }
???? // 脑残法，判断手机发送的客户端标志,兼容性有待提高
???? if (isset ( $_SERVER [ ‘HTTP_USER_AGENT‘ ]))
???? {
???????? $clientkeywords = array ( ‘nokia‘ ,
???????????? ‘sony‘ ,
???????????? ‘ericsson‘ ,
???????????? ‘mot‘ ,
???????????? ‘samsung‘ ,
???????????? ‘htc‘ ,
???????????? ‘sgh‘ ,
???????????? ‘lg‘ ,
???????????? ‘sharp‘ ,
???????????? ‘sie-‘ ,
???????????? ‘philips‘ ,
???????????? ‘panasonic‘ ,
???????????? ‘alcatel‘ ,
???????????? ‘lenovo‘ ,
???????????? ‘iphone‘ ,
???????????? ‘ipod‘ ,
???????????? ‘blackberry‘ ,
???????????? ‘meizu‘ ,
???????????? ‘android‘ ,
???????????? ‘netfront‘ ,
???????????? ‘symbian‘ ,
???????????? ‘ucweb‘ ,
???????????? ‘windowsce‘ ,
???????????? ‘palm‘ ,
???????????? ‘operamini‘ ,
???????????? ‘operamobi‘ ,
???????????? ‘openwave‘ ,
???????????? ‘nexusone‘ ,
???????????? ‘cldc‘ ,
???????????? ‘midp‘ ,
???????????? ‘wap‘ ,
???????????? ‘mobile‘
???????????? );
???????? // 从HTTP_USER_AGENT中查找手机浏览器的关键字
???????? if (preg_match( "/(" . implode( ‘|‘ , $clientkeywords ) . ")/i" , strtolower ( $_SERVER [ ‘HTTP_USER_AGENT‘ ])))
???????? {
???????????? return true;
???????? }
???? }
???? // 协议法，因为有可能不准确，放到最后判断
???? if (isset ( $_SERVER [ ‘HTTP_ACCEPT‘ ]))
???? {
???????? // 如果只支持wml并且不支持html那一定是移动设备
???????? // 如果支持wml和html但是wml在html之前则是移动设备
???????? if (( strpos ( $_SERVER [ ‘HTTP_ACCEPT‘ ], ‘vnd.wap.wml‘ ) !== false) && ( strpos ( $_SERVER [ ‘HTTP_ACCEPT‘ ], ‘text/html‘ ) === false || ( strpos ( $_SERVER [ ‘HTTP_ACCEPT‘ ], ‘vnd.wap.wml‘ ) < strpos ( $_SERVER [ ‘HTTP_ACCEPT‘ ], ‘text/html‘ ))))
???????? {
???????????? return true;
???????? }
???? }
???? return false;
}
//判断是否为安卓手机
public function isAndroid()
{
???? if (isset( $_SERVER [ ‘HTTP_USER_AGENT‘ ])){
???????? $agent = strtolower ( $_SERVER [ ‘HTTP_USER_AGENT‘ ]);
???????? if ( strpos ( $agent , ‘android‘ ) !== false)
???????????? return true;
???? }
???? return false;
}
//判断是否为iphone或者ipad
public function isIos()
{
???? if (isset( $_SERVER [ ‘HTTP_USER_AGENT‘ ])){
???????? $agent = strtolower ( $_SERVER [ ‘HTTP_USER_AGENT‘ ]);
???????? if ( strpos ( $agent , ‘iphone‘ )|| strpos ( $agent , ‘ipad‘ ))
???????????? return true;
???? }
???? return false;
}
//判断是否为微信内置浏览器打开
public function isWechet()
{
???? if (isset( $_SERVER [ ‘HTTP_USER_AGENT‘ ]) && strpos ( $_SERVER [ ‘HTTP_USER_AGENT‘ ], ‘MicroMessenger‘ ) !== false){
???????? return true;
???? }
???? return false;
}
//整合到一起，判断当前设备，1：安卓；2：IOS；3：微信；0：未知
public function isDevice()
{
???? if ( $_SERVER [ ‘HTTP_USER_AGENT‘ ]){
???????? $agent = strtolower ( $_SERVER [ ‘HTTP_USER_AGENT‘ ]);
???????? if ( strpos ( $agent , ‘micromessenger‘ ) !== false)
???????????? return 3;
???????? elseif ( strpos ( $agent , ‘ipad‘ ))
???????????? return 2;
???????? else
???????????? return 1;
???? }
???? return 0;
}
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/**
? * 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‘ ;
???????? }
???? }
}
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/**
? * 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 , $number );
???????????? $length -= 1.0;
???????????? $i += $number - 1;
???????? } else {
???????????? $result .= substr ( $string ,1);
???????????? $length -= 0.5;
???????? }
???? }
???? if ( $isStripTag )
???????? $result = htmlspecialchars( $result , ‘UTF-8‘ );
?????????
???? if ( $i < $strlen ){
???????? $result .= $etc ;
???? }
???? return $result ;
}
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/**
? * utf-8和gb2312自动转化
? * @param unknown $string
? * @param string $outEncoding
? * @return unknown|string
? */
function safeEncoding( $string , $outEncoding = ‘UTF-8‘ )
{
???? $encoding = "UTF-8" ;
???? for ( $i = 0; $i < strlen ( $string ); $i ++) {
???????? if (ord ( $string { $i } ) < 128)
???????????? continue ;
?
???????? if ((ord ( $string { $i } ) & 224) == 224) {
???????????? // 第一个字节判断通过
???????????? $char = $string {++ $i };
???????????? if ((ord ( $char ) & 128) == 128) {
???????????????? // 第二个字节判断通过
???????????????? $char = $string {++ $i };
???????????????? if ((ord ( $char ) & 128) == 128) {
???????????????????? $encoding = "UTF-8" ;
???????????????????? break ;
???????????????? }
???????????? }
???????? }
???????? if ((ord ( $string { $i } ) & 192) == 192) {
???????????? // 第一个字节判断通过
???????????? $char = $string {++ $i };
???????????? if ((ord ( $char ) & 128) == 128) {
???????????????? // 第二个字节判断通过
???????????????? $encoding = "GB2312" ;
???????????????? break ;
???????????? }
???????? }
???? }
?
???? if ( strtoupper ( $encoding ) == strtoupper ( $outEncoding ))
???????? return $string ;
???? else
???????? return @iconv ( $encoding , $outEncoding , $string );
}
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/**
? *对内容中的关键词添加链接
? *只处理第一次出现的关键词，对已有链接的关键不会再加链接，支持中英文
? *$content:string 原字符串
? *$keyword:string? 关键词
? *$link:string,链接
? */
function yang_keyword_link( $content , $keyword , $link ){
????? //排除图片中的关键词
????? $content = preg_replace( ‘|(<img[^>]*?)(‘ . $keyword . ‘)([^>]*?>)|U‘ , ‘$1%&&&&&%$3‘ , $content );
????? $regEx = ‘/(?!((<.*?)|(<a.*?)))(‘ . $keyword . ‘)(?!(([^<>]*?)>)|([^>]*?</a>))/si‘ ;
????? $url = ‘<a href="‘ . $link . ‘" target="_blank" class="content_guanjianci">‘ . $keyword . ‘</a>‘ ;
????? $content = preg_replace( $regEx , $url , $content ,1);
????? //还原图片中的关键词
????? $content = str_replace ( ‘%&&&&&%‘ , $content );
????? return $content ;
? }

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