php基本函數匯總_php技巧

1.統計數組元素個數

$arr = array(   '1011,1003,1008,1001,1000,1004,1012',   '1009',   '1011,1003,1111'  );$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. 迴圈刪除目錄

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.無限極分類產生樹

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' => '長豐縣'),  5 => array('id' => 5, 'pid' => 1, 'name' => '安慶市'),);print_r(generateTree($items));/** * 如何取資料格式化的樹形資料 */$tree = generateTree($items);function getTreeData($tree){  foreach($tree as $t){    echo $t['name'].'<br>';    if(isset($t['son'])){      getTreeData($t['son']);    }  }}

4.數組排序 a - b 是數字數組寫法 遇到字串的時候就要

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 的第三個參數是 $result 的初始值array_reduce($raw, function($result, $value) {  $result[$value] = $value;  return $result;}, []);// [1 => 1, 2 => 2, ... 5 => 5]

6.array_map 閉包中只接受一個或者多個參數，閉包的參數數量和 array_map 本身的參數數量必須一致

$input = ['key' => 'value'];array_map(function($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; $i++)   {     echo sprintf("第{%d}個月兔子為：{%d}",$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 . 多維陣列降級

function array_flatten($arr) {  $result = [];  array_walk_recursive($arr, function($value) use (&$result) {    $result[] = $value;  });  return $result;}print_r(array_flatten([1,[2,3],[4,5]]));// [1,[2,3],[4,5]] => [1,2,3,4,5]// var new_array = old_array.concat(value1[, value2[, ...[, valueN]]])var test = [1,2,3,[4,5,6],[7,8]];[].concat.apply([], test); // [1,2,3,4,5,6,7,8] 對於 test 數組中的每一個 value， 將它 concat 到空數組 [] 中去，而因為 concat 是 Array 的 prototype，所以我們用一個空 array 作載體var test1 = [1,2,[3,[4,[5]]]];function flatten(arr) {  return arr.reduce(function(pre, cur) {    if(Array.isArray(cur)) {      return flatten(pre.concat(cur));    }    return pre.concat(cur);  }, []);}// [1,2,3,4,5]json_encode中文function json_encode_wrapper ($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)    );  }}

12.二維數組去重

$arr = array(  array('id'=>'2','title'=>'...','ding'=>'1','jing'=>'1','time'=>'...','url'=>'...','dj'=>'...'),  array('id'=>'2','title'=>'...','ding'=>'1','jing'=>'1','time'=>'...','url'=>'...','dj'=>'...'));function about_unique($arr=array()){   /*將該種二維數組看成一維數組，則   該一維數組的value值有相同的則幹掉只留一個，並將該一維   數組用重排後的索引數組返回，而返回的一維數組中的每個元素都是   原始key值形成的關聯陣列  */  $keys =array();  $temp = array();  foreach($arr[0] as $k=>$arrays) {  /*數組記錄下關聯陣列的key值*/     $keys[] = $k;  }  //return $keys;  /*降維*/  foreach($arr as $k=>$v) {  $v = join(",",$v); //降維     $temp[] = $v;  }  $temp = array_unique($temp); //去掉重複的內容  foreach ($temp as $k => $v){  /*再將拆開的數組按索引數組重新組裝*/     $temp[$k] = explode(",",$v);   }   //return $temp;  /*再將拆開的數組按關聯陣列key值重新組裝*/  foreach($temp as $k=>$v) {  foreach($v as $kkk=>$ck) {   $data[$k][$keys[$kkk]] = $temp[$k][$kkk];  }  }  return $data; }

13.格式化位元組大小

/*** 格式化位元組大小* @param number $size   位元組數* @param string $delimiter 數字和單位分隔字元* @return string      格式化後的帶單位的大小* @author */function format_bytes($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分鐘前

/*** 將指定時間戳記轉換為截止當前的xx時間前的格式 例如 return '3分鐘前''* @param string|int $timestamp unix時間戳記* @return string*/function time_ago($timestamp) {  $etime = time() - $timestamp;  if ($etime < 1) return '剛剛';     $interval = array (        12 * 30 * 24 * 60 * 60 => '年前 ('.date('Y-m-d', $timestamp).')',   30 * 24 * 60 * 60    => '個月前 ('.date('m-d', $timestamp).')',   7 * 24 * 60 * 60    => '周前 ('.date('m-d', $timestamp).')',   24 * 60 * 60      => '天前',   60 * 60         => '小時前',   60           => '分鐘前',   1            => '秒前'  );  foreach ($interval as $secs => $str) {    $d = $etime / $secs;    if ($d >= 1) {      $r = round($d);      return $r . $str;    }  };}

15.社會安全號碼

/*** 判斷參數字串是否為天朝社會安全號碼* @param $id 需要被判斷的字串或數字* @return mixed false 或 array[有內容的array boolean為真]*/function is_citizen_id($id) {  //長度效驗 18位身份證中的X為大寫  $id = strtoupper($id);  if(!(preg_match('/^\d{17}(\d|X)$/',$id) || preg_match('/^\d{15}$/',$id))) {   return false;  }  //15位老號碼轉換為18位 並轉換成字串  $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];  }  //效驗18位身份證最後一位字元的合法性  $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;}  //地區效驗  $oCity    = array(11=>"北京",12=>"天津",13=>"河北",14=>"山西",15=>"內蒙古",21=>"遼寧",22=>"吉林",23=>"黑龍江",31=>"上海",32=>"江蘇",33=>"浙江",34=>"安徽",35=>"福建",36=>"江西",37=>"山東",41=>"河南",42=>"湖北",43=>"湖南",44=>"廣東",45=>"廣西",46=>"海南",50=>"重慶",51=>"四川",52=>"貴州",53=>"雲南",54=>"西藏",61=>"陝西",62=>"甘肅",63=>"青海",64=>"寧夏",65=>"新疆",71=>"台灣",81=>"香港",82=>"澳門",91=>"國外");  $City    = substr($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    = $Sex?'男':'女';  //地區驗證  if(is_null($oCity[$City])) {return false;}  //出生日期效驗  if($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.擷取二維數組中某個key的集合

$user = array( 0 => array( 'id' => 1, 'name' => '張三', 'email' => 'zhangsan@sina.com', ), 1 => array( 'id' => 2, 'name' => '李四', 'email' => 'lisi@163.com', ), 2 => array( 'id' => 5, 'name' => '王五', 'email' => '10000@qq.com', ), ...... );$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內容了，希望大家能夠喜歡。