php基本函數匯總

2024-09-04 11:42:31

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本文給大家匯總了16個常見的php基本函數，涵蓋的面很廣，這里推薦給大家，希望對大家學習php能夠有所幫助。

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. 循環刪除目錄

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.無限極分類生成樹

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));

/**

* 如何取數據格式化的樹形數據

*/

$tree = generateTree($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符串的時候就要

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 . 多維數組降級

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] 對于 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值有相同的則干掉只留一個，并將該一維   數組用重排后的索引數組返回，而返回的一維數組中的每個元素都是   原始key值形成的關聯數組  */

$keys =array();

  $temp = array();

  foreach($arr[0] as $k=>$arrays) {

  /*數組記錄下關聯數組的key值*/

  $keys[] = $k;

  }

  //return $keys;  /*降維*/

foreach($arr as $k=>$v) {

  $v = join(",",$v); //降維

  $temp[] = $v;

  }

  $temp = array_unique($temp); //去掉重復的內容

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數組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.格式化字節大小

/**

* 格式化字節大小

* @param number $size   字節數

* @param string $delimiter 數字和單位分隔符

* @return string      格式化后的帶單位的大小

* @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

* @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.身份證號

/**

* 判斷參數字符串是否為天朝身份證號

* @param $id 需要被判斷的字符串或數字

* @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位并轉換成字符串

  $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];

  }

  //效驗18位身份證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=>"云南",54=>"西藏",61=>"陜西",62=>"甘肅",63=>"青海",64=>"寧夏",65=>"新疆",71=>"臺灣",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';

  //地域驗證

  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.獲取二維數組中某個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;'));