cari

Rumah >pembangunan bahagian belakang >tutorial php >16个常见的php基本函数

16个常见的php基本函数

墨辰丷
墨辰丷asal
2018-06-08 18:04:172411semak imbas

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 $t[&#39;name&#39;].&#39;<br>&#39;;
    if(isset($t[&#39;son&#39;])){
      getTreeData($t[&#39;son&#39;]);
    }
  }
}

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 = [&#39;ab&#39;, &#39;ac&#39;, &#39;bd&#39;, &#39;bc&#39;];
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

$input = [&#39;key&#39; => &#39;value&#39;];
array_map(function($key, $value) {
  echo $key . $value;
}, array_keys($input), $input)
// &#39;keyvalue&#39;
$double = function($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($date)
{
  return date(&#39;Y-m-01&#39;, strtotime($date));
}
 getCurMonthLastDay(&#39;2015-07-23&#39;)
function getCurMonthLastDay($date)
{
  return date(&#39;Y-m-d&#39;, strtotime(date(&#39;Y-m-01&#39;, strtotime($date)) . &#39; +1 month -1 day&#39;));
}

9.加密解密

function encrypt($data, $key)
{
  $key  =  md5($key);
  $x   =  0;
  $len  =  strlen($data);
  $l   =  strlen($key);
  $char  =  &#39;&#39;;
  for ($i = 0; $i < $len; $i++)
  {
    if ($x == $l)
    {
      $x = 0;
    }
    $char .= $key{$x};
    $x++;
  }
  $str  =  &#39;&#39;;
  for ($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);
  $char = &#39;&#39;;
  for ($i = 0; $i < $len; $i++)
  {
    if ($x == $l)
    {
      $x = 0;
    }
    $char .= substr($key, $x, 1);
    $x++;
  }
  $str = &#39;&#39;;
  for ($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(&#39;JSON_UNESCAPED_UNICODE&#39;)){
    return json_encode($result,JSON_UNESCAPED_UNICODE|JSON_NUMERIC_CHECK);
  }else {
    return preg_replace(
      array("#\\\u([0-9a-f][0-9a-f][0-9a-f][0-9a-f])#ie", "/\"(\d+)\"/",),
      array("iconv(&#39;UCS-2&#39;, &#39;UTF-8&#39;, pack(&#39;H4&#39;, &#39;\\1&#39;))", "\\1"),
      json_encode($result)
    );
  }
}

12.二维数组去重

$arr = array(
  array(&#39;id&#39;=>&#39;2&#39;,&#39;title&#39;=>&#39;...&#39;,&#39;ding&#39;=>&#39;1&#39;,&#39;jing&#39;=>&#39;1&#39;,&#39;time&#39;=>&#39;...&#39;,&#39;url&#39;=>&#39;...&#39;,&#39;dj&#39;=>&#39;...&#39;),
  array(&#39;id&#39;=>&#39;2&#39;,&#39;title&#39;=>&#39;...&#39;,&#39;ding&#39;=>&#39;1&#39;,&#39;jing&#39;=>&#39;1&#39;,&#39;time&#39;=>&#39;...&#39;,&#39;url&#39;=>&#39;...&#39;,&#39;dj&#39;=>&#39;...&#39;)
);
function about_unique($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 = &#39;&#39;) {
 $units = array(&#39;B&#39;, &#39;KB&#39;, &#39;MB&#39;, &#39;GB&#39;, &#39;TB&#39;, &#39;PB&#39;);
 for ($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 &#39;3分钟前&#39;&#39;
* @param string|int $timestamp unix时间戳
* @return string
*/
function time_ago($timestamp) {
  $etime = time() - $timestamp;
  if ($etime < 1) return &#39;刚刚&#39;;   
  $interval = array (     
   12 * 30 * 24 * 60 * 60 => &#39;年前 (&#39;.date(&#39;Y-m-d&#39;, $timestamp).&#39;)&#39;,
   30 * 24 * 60 * 60    => &#39;个月前 (&#39;.date(&#39;m-d&#39;, $timestamp).&#39;)&#39;,
   7 * 24 * 60 * 60    => &#39;周前 (&#39;.date(&#39;m-d&#39;, $timestamp).&#39;)&#39;,
   24 * 60 * 60      => &#39;天前&#39;,
   60 * 60         => &#39;小时前&#39;,
   60           => &#39;分钟前&#39;,
   1            => &#39;秒前&#39;
  );
  foreach ($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(&#39;/^\d{17}(\d|X)$/&#39;,$id) || preg_match(&#39;/^\d{15}$/&#39;,$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(&#39;1&#39;, &#39;0&#39;, &#39;X&#39;, &#39;9&#39;, &#39;8&#39;, &#39;7&#39;, &#39;6&#39;, &#39;5&#39;, &#39;4&#39;, &#39;3&#39;, &#39;2&#39;); 
  $cardNoSum  = 0;
  if(strlen($id)==16) {
    $id    = substr(0, 6).&#39;19&#39;.substr(6, 9); 
    for($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    = $Sex?&#39;男&#39;:&#39;女&#39;;
  //地域验证
  if(is_null($oCity[$City])) {return false;}
  //出生日期效验
  if($BirthYear>2078 || $BirthYear<1900) {return false;}
  $RealDate  = strtotime($BirthYear.&#39;-&#39;.$BirthMonth.&#39;-&#39;.$BirthDay);
  if(date(&#39;Y&#39;,$RealDate)!=$BirthYear || date(&#39;m&#39;,$RealDate)!=$BirthMonth || date(&#39;d&#39;,$RealDate)!=$BirthDay) {
    return false;
  }
  return array(&#39;id&#39;=>$id,&#39;location&#39;=>$oCity[$City],&#39;Y&#39;=>$BirthYear,&#39;m&#39;=>$BirthMonth,&#39;d&#39;=>$BirthDay,&#39;sex&#39;=>$Sex);
}

16.获取二维数组中某个key的集合

$user = array( 0 => array( &#39;id&#39; => 1, &#39;name&#39; => &#39;张三&#39;, &#39;email&#39; => &#39;zhangsan@sina.com&#39;, ), 1 => array( &#39;id&#39; => 2, &#39;name&#39; => &#39;李四&#39;, &#39;email&#39; => &#39;lisi@163.com&#39;, ), 2 => array( &#39;id&#39; => 5, &#39;name&#39; => &#39;王五&#39;, &#39;email&#39; => &#39;10000@qq.com&#39;, ), ...... );
$ids = array(); $ids = array_map(&#39;array_shift&#39;, $user);
$ids = array_column($user, &#39;id&#39;);//php5.5
$names = array(); $names = array_reduce($user, create_function(&#39;$v,$w&#39;, &#39;$v[$w["id"]]=$w["name"];return $v;&#39;));

总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。

相关推荐：

PHP制作用户注册系统的详细代码

php实现了CSV格式数据的导入和导出功能

php中存缓分类数据库缓存

Atas ialah kandungan terperinci 16个常见的php基本函数. Untuk maklumat lanjut, sila ikut artikel berkaitan lain di laman web China PHP!

Kenyataan：
Kandungan artikel ini disumbangkan secara sukarela oleh netizen, dan hak cipta adalah milik pengarang asal. Laman web ini tidak memikul tanggungjawab undang-undang yang sepadan. Jika anda menemui sebarang kandungan yang disyaki plagiarisme atau pelanggaran, sila hubungi admin@php.cn
Artikel sebelumnya：关于php文件包含目录配置open_basedir的使用与性能分析Artikel seterusnya：PHP实例分析了mysql事务处理的使用技巧

Artikel berkaitan

Lihat lagi