php基本函数汇总
发布:smiling 来源: PHP粉丝网 添加日期:2021-06-10 10:20:12 浏览: 评论:0
本文给大家汇总了16个常见的php基本函数,涵盖的面很广,这里推荐给大家,希望对大家学习php能够有所帮助。
1.统计数组元素个数
- $arr = array(
- '1011,1003,1008,1001,1000,1004,1012',
- '1009',
- '1011,1003,1111'
- );
- $result = array();
- foreach ($arr as $str) {
- $str_arr = explode(',', $str);
- foreach ($str_arr as $v) {
- // $result[$v] = isset($result[$v]) ? $result[$v] : 0;
- // $result[$v] = $result[$v] + 1;
- $result[$v] = isset($result[$v]) ? $result[$v]+1 : 1;
- }
- }
- print_r($result);
- //Array
- (
- [1011] => 2
- [1003] => 2
- [1008] => 1
- [1001] => 1
- [1000] => 1
- [1004] => 1
- [1012] => 1
- [1009] => 1
- [1111] => 1
- )
2. 循环删除目录
- function cleanup_directory($dir) {
- foreach (new DirectoryIterator($dir) as $file) {
- if ($file->isDir()) {
- if (! $file->isDot()) {
- cleanup_directory($file->getPathname());
- }
- } else {
- unlink($file->getPathname());
- }
- }
- rmdir($dir);
- }
3.无限极分类生成树
- function generateTree($items){
- $tree = array();
- foreach($items as $item){
- if(isset($items[$item['pid']])){
- $items[$item['pid']]['son'][] = &$items[$item['id']];
- }else{
- $tree[] = &$items[$item['id']];
- }
- }
- return $tree;
- }
- function generateTree2($items){
- foreach($items as $item)
- $items[$item['pid']]['son'][$item['id']] = &$items[$item['id']];
- return isset($items[0]['son']) ? $items[0]['son'] : array();
- }
- $items = array(
- 1 => array('id' => 1, 'pid' => 0, 'name' => '安徽省'),
- 2 => array('id' => 2, 'pid' => 0, 'name' => '浙江省'),
- 3 => array('id' => 3, 'pid' => 1, 'name' => '合肥市'),
- 4 => array('id' => 4, 'pid' => 3, 'name' => '长丰县'),
- 5 => array('id' => 5, 'pid' => 1, 'name' => '安庆市'),
- );
- print_r(generateTree($items));
- /**
- * 如何取数据格式化的树形数据
- */
- $tree = generateTree($items);
- function getTreeData($tree){
- foreach($tree as $t){
- echo $t['name'].'<br>';
- if(isset($t['son'])){
- getTreeData($t['son']);
- }
- }
- }
4.数组排序 a - b 是数字数组写法 遇到字符串的时候就要
- var test = ['ab', 'ac', 'bd', 'bc'];
- test.sort(function(a, b) {
- if(a < b) {
- return -1;
- }
- if(a > b) {
- return 1;
- }
- return 0;
- });
5.array_reduce
- $raw = [1,2,3,4,5,];
- // array_reduce 的第三个参数是 $result 的初始值
- array_reduce($raw, function($result, $value) {
- $result[$value] = $value;
- return $result;
- }, []);
- // [1 => 1, 2 => 2, ... 5 => 5]
6.array_map 闭包中只接受一个或者多个参数,闭包的参数数量和 array_map 本身的参数数量必须一致
- $input = ['key' => 'value'];
- array_map(function($key, $value) {
- echo $key . $value;
- }, array_keys($input), $input)
- // 'keyvalue'
- $double = function($item) {
- return 2 * $item;
- }
- $result = array_map($double, [1,2,3]);
- // 2 4 6
7.繁殖兔子
- $month = 12;
- $fab = array();
- $fab[0] = 1;
- $fab[1] = 1;
- for ($i = 2; $i < $month; $i++)
- {
- $fab[$i] = $fab[$i - 1] + $fab[$i - 2];
- }
- for ($i = 0; $i < $month; $i++)
- {
- echo sprintf("第{%d}个月兔子为:{%d}",$i, $fab[$i])."<br/>";
- }
8 .datetime
- function getCurMonthFirstDay($date)
- {
- return date('Y-m-01', strtotime($date));
- }
- getCurMonthLastDay('2015-07-23')
- function getCurMonthLastDay($date)
- {
- return date('Y-m-d', strtotime(date('Y-m-01', strtotime($date)) . ' +1 month -1 day'));
- }
9.加密解密
- function encrypt($data, $key)
- {
- $key = md5($key);
- $x = 0;
- $len = strlen($data);
- $l = strlen($key);
- $char = '';
- for ($i = 0; $i < $len; $i++)
- {
- if ($x == $l)
- {
- $x = 0;
- }
- $char .= $key{$x};
- $x++;
- }
- $str = '';
- for ($i = 0; $i < $len; $i++)
- {
- $str .= chr(ord($data{$i}) + (ord($char{$i})) % 256);
- }
- return base64_encode($str);
- }
- function decrypt($data, $key)
- {
- $key = md5($key);
- $x = 0;
- $data = base64_decode($data);
- $len = strlen($data);
- $l = strlen($key);
- $char = '';
- for ($i = 0; $i < $len; $i++)
- {
- if ($x == $l)
- {
- $x = 0;
- }
- $char .= substr($key, $x, 1);
- $x++;
- }
- $str = '';
- for ($i = 0; $i < $len; $i++)
- {
- if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1)))
- {
- $str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1)));
- }
- else
- {
- $str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1)));
- }
- }
- return $str;
- }
10 . 多维数组降级
- function array_flatten($arr) {
- $result = [];
- array_walk_recursive($arr, function($value) use (&$result) {
- $result[] = $value;
- });
- return $result;
- }
- print_r(array_flatten([1,[2,3],[4,5]]));// [1,[2,3],[4,5]] => [1,2,3,4,5]
- // var new_array = old_array.concat(value1[, value2[, ...[, valueN]]])
- var test = [1,2,3,[4,5,6],[7,8]];
- [].concat.apply([], test); // [1,2,3,4,5,6,7,8] 对于 test 数组中的每一个 value, 将它 concat 到空数组 [] 中去,而因为 concat 是 Array 的 prototype,所以我们用一个空 array 作载体
- var test1 = [1,2,[3,[4,[5]]]];
- function flatten(arr) {
- return arr.reduce(function(pre, cur) {
- if(Array.isArray(cur)) {
- return flatten(pre.concat(cur));
- }
- return pre.concat(cur);
- }, []);
- }
- // [1,2,3,4,5]
- json_encode中文
- function json_encode_wrapper ($result)
- {
- if(defined('JSON_UNESCAPED_UNICODE')){
- return json_encode($result,JSON_UNESCAPED_UNICODE|JSON_NUMERIC_CHECK);
- }else {
- return preg_replace(
- array("#\\\u([0-9a-f][0-9a-f][0-9a-f][0-9a-f])#ie", "/\"(\d+)\"/",),
- array("iconv('UCS-2', 'UTF-8', pack('H4', '\\1'))", "\\1"),
- json_encode($result)
- );
- }
- }
12.二维数组去重
- $arr = array(
- array('id'=>'2','title'=>'...','ding'=>'1','jing'=>'1','time'=>'...','url'=>'...','dj'=>'...'),
- array('id'=>'2','title'=>'...','ding'=>'1','jing'=>'1','time'=>'...','url'=>'...','dj'=>'...')
- );
- function about_unique($arr=array()){
- /*将该种二维数组看成一维数组,则 该一维数组的value值有相同的则干掉只留一个,并将该一维 数组用重排后的索引数组返回,而返回的一维数组中的每个元素都是 原始key值形成的关联数组 */
- $keys =array();
- $temp = array();
- foreach($arr[0] as $k=>$arrays) {
- /*数组记录下关联数组的key值*/
- $keys[] = $k;
- }
- //return $keys; /*降维*/
- foreach($arr as $k=>$v) {
- $v = join(",",$v); //降维
- $temp[] = $v;
- }
- $temp = array_unique($temp); //去掉重复的内容
- foreach ($temp as $k => $v){
- /*再将拆开的数组按索引数组重新组装*/
- $temp[$k] = explode(",",$v);
- }
- //return $temp; /*再将拆开的数组按关联数组key值重新组装*/
- foreach($temp as $k=>$v) {
- foreach($v as $kkk=>$ck) {
- $data[$k][$keys[$kkk]] = $temp[$k][$kkk];
- }
- }
- return $data;
- }
13.格式化字节大小
- /**
- * 格式化字节大小
- * @param number $size 字节数
- * @param string $delimiter 数字和单位分隔符
- * @return string 格式化后的带单位的大小
- * @author
- */
- function format_bytes($size, $delimiter = '') {
- $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');
- for ($i = 0; $size >= 1024 && $i < 6; $i++) $size /= 1024;
- return round($size, 2) . $delimiter . $units[$i];
- }
14.3分钟前
- /**
- * 将指定时间戳转换为截止当前的xx时间前的格式 例如 return '3分钟前''
- * @param string|int $timestamp unix时间戳
- * @return string
- */
- function time_ago($timestamp) {
- $etime = time() - $timestamp;
- if ($etime < 1) return '刚刚';
- $interval = array (
- 12 * 30 * 24 * 60 * 60 => '年前 ('.date('Y-m-d', $timestamp).')',
- 30 * 24 * 60 * 60 => '个月前 ('.date('m-d', $timestamp).')',
- 7 * 24 * 60 * 60 => '周前 ('.date('m-d', $timestamp).')',
- 24 * 60 * 60 => '天前',
- 60 * 60 => '小时前',
- 60 => '分钟前',
- 1 => '秒前'
- );
- foreach ($interval as $secs => $str) {
- $d = $etime / $secs;
- if ($d >= 1) {
- $r = round($d);
- return $r . $str;
- }
- };
- }
15.身份证号
- /**
- * 判断参数字符串是否为天朝身份证号
- * @param $id 需要被判断的字符串或数字
- * @return mixed false 或 array[有内容的array boolean为真]
- */
- function is_citizen_id($id) {
- //长度效验 18位身份证中的X为大写
- $id = strtoupper($id);
- if(!(preg_match('/^\d{17}(\d|X)$/',$id) || preg_match('/^\d{15}$/',$id))) {
- return false;
- }
- //15位老号码转换为18位 并转换成字符串
- $Wi = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1);
- $Ai = array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');
- $cardNoSum = 0;
- if(strlen($id)==16) {
- $id = substr(0, 6).'19'.substr(6, 9);
- for($i = 0; $i < 17; $i++) {
- $cardNoSum += substr($id,$i,1) * $Wi[$i];
- }
- $seq = $cardNoSum % 11;
- $id = $id.$Ai[$seq];
- }
- //效验18位身份证最后一位字符的合法性
- $cardNoSum = 0;
- $id17 = substr($id,0,17);
- $lastString = substr($id,17,1);
- for($i = 0; $i < 17; $i++) {
- $cardNoSum += substr($id,$i,1) * $Wi[$i];
- }
- $seq = $cardNoSum % 11;
- $realString = $Ai[$seq];
- if($lastString!=$realString) {return false;}
- //地域效验
- $oCity = array(11=>"北京",12=>"天津",13=>"河北",14=>"山西",15=>"内蒙古",21=>"辽宁",22=>"吉林",23=>"黑龙江",31=>"上海",32=>"江苏",33=>"浙江",34=>"安徽",35=>"福建",36=>"江西",37=>"山东",41=>"河南",42=>"湖北",43=>"湖南",44=>"广东",45=>"广西",46=>"海南",50=>"重庆",51=>"四川",52=>"贵州",53=>"云南",54=>"西藏",61=>"陕西",62=>"甘肃",63=>"青海",64=>"宁夏",65=>"新疆",71=>"台湾",81=>"香港",82=>"澳门",91=>"国外");
- $City = substr($id, 0, 2);
- $BirthYear = substr($id, 6, 4);
- $BirthMonth = substr($id, 10, 2);
- $BirthDay = substr($id, 12, 2);
- $Sex = substr($id, 16,1) % 2 ;//男1 女0
- //$Sexcn = $Sex?'男':'女';
- //地域验证
- if(is_null($oCity[$City])) {return false;}
- //出生日期效验
- if($BirthYear>2078 || $BirthYear<1900) {return false;}
- $RealDate = strtotime($BirthYear.'-'.$BirthMonth.'-'.$BirthDay);
- if(date('Y',$RealDate)!=$BirthYear || date('m',$RealDate)!=$BirthMonth || date('d',$RealDate)!=$BirthDay) {
- return false;
- }
- return array('id'=>$id,'location'=>$oCity[$City],'Y'=>$BirthYear,'m'=>$BirthMonth,'d'=>$BirthDay,'sex'=>$Sex);
- }
16.获取二维数组中某个key的集合
- $user = array( 0 => array( 'id' => 1, 'name' => '张三', 'email' => 'zhangsan@sina.com', ), 1 => array( 'id' => 2, 'name' => '李四', 'email' => 'lisi@163.com', ), 2 => array( 'id' => 5, 'name' => '王五', 'email' => '10000@qq.com', ), ...... );
- $ids = array(); $ids = array_map('array_shift', $user);
- $ids = array_column($user, 'id');//php5.5
- $names = array(); $names = array_reduce($user, create_function('$v,$w', '$v[$w["id"]]=$w["name"];return $v;'));
以上所述就是本文的全部内容了,希望大家能够喜欢。
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