php基本函数汇总


            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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