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;"));

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