11种PHP常用函数分享

function debug($data){

    if(empty($data)){
        var_dump($data);
        die;
    }

    if(!is_array($data)){
        echo "<pre style='background-color: #000;color: #fff;font-size: 14px;min-height: 100px;line-height: 50px;'>";
        echo "<span style='margin-left: 20px;font-size: 18px;'>";
        print_r($data);
        echo "</span>";
        echo "</pre>";
        die;
    }

    echo "<pre style='background-color: #000;color: #fff;font-size: 14px;min-height: 100px;'>";
    echo "<br /><br /><br /><span style='margin-left: 20px;font-size: 13px;'>";
    print_r($data);
    echo "</span><br /><br /><br />";
    echo "</pre>";
    die;
}

/* @param   $data  array   数据
* @param   $pid   int     父类关系值
* @param   $parentFieldstring  父类字段
* @param $pkField string  主键字段
* return array
*/
function getTreesPro($data,$pid='0',$parentField='pid',$pkField='id'){
        $tree =array();
        foreach($data as $k=>$v){

            if($v[$parentField] == $pid){
                $temp   =   getTreesPro($data,$v[$pkField]);//$data是对象则改为$v－>$pkField
                if(!empty($temp)){
                //分层
                    $v['son']= getTreesPro($data,$v[$pkField]);
                }
                $tree[] = $v;
            }
        }
        return $tree;
    }

function arrayToObject($arr){
    if(is_array($arr)){
        return (object) array_map(__FUNCTION__, $arr);
    }else{
        return $arr;
    }
}

function object2array(&$object) {
    $object =  json_decode( json_encode( $object),true);
    return  $object;
}

function generateJnlNo() {
   date_default_timezone_set('PRC');
   $yCode    = array('A','B','C','D','E','F','G','H','I','J');
   $orderSn  = '';
   $orderSn .= $yCode[(intval(date('Y')) - 1970) % 10];
   $orderSn .= strtoupper(dechex(date('m')));
   $orderSn .= date('d').substr(time(), -5);
   $orderSn .= substr(microtime(), 2, 5);
   $orderSn .= sprintf('%02d', mt_rand(0, 99));
   //echo $orderSn,PHP_EOL;     //得到唯一订单号：G107347128750079
   return $orderSn;
}

/**
* 用法1：
* @code php
* $rows = array(
*     array('id' => 1, 'value' => '1-1'),
*     array('id' => 2, 'value' => '2-1'),
*);
* $hashmap = Helper_Array::hashMap($rows, 'id', 'value');
*
* dump($hashmap);
*   // 输出结果为
*   // array(
*   //   1 => '1-1',
*   //   2 => '2-1',
*   //)
* @endcode
*
* 如果省略 $value_field 参数，则转换结果每一项为包含该项所有数据的数组。
*
* 用法2：
* @code php
* $rows = array(
*     array('id' => 1, 'value' => '1-1'),
*     array('id' => 2, 'value' => '2-1'),
*);
* $hashmap = Helper_Array::hashMap($rows, 'id');
*
* dump($hashmap);
*   // 输出结果为
*   // array(
*   //   1 => array('id' => 1, 'value' => '1-1'),
*   //   2 => array('id' => 2, 'value' => '2-1'),
*   //)
* @endcode
*
* @param array $arr 数据源
* @param string $key_field 按照什么键的值进行转换
* @param string $value_field 对应的键值
*
* @return array 转换后的 HashMap 样式数组
*/
function to_hashmap($arr, $key_field, $value_field = null){
     $ret = array();
     if ($value_field){
         foreach ($arr as $row){
             $ret[$row[$key_field]] = $row[$value_field];
         }
     } 
     else{
         foreach ($arr as $row){
             $ret[$row[$key_field]] = $row;
         }
     }
     return $ret;
}

if (!function_exists('array_column')) {

   /**
    * Returns the values from a single column of the input array, identified by
    * the $columnKey.
    *
    * Optionally, you may provide an $indexKey to index the values in the returned
    * array by the values from the $indexKey column in the input array.
    *
    * @param array $input A multi-dimensional array (record set) from which to pull
    *                     a column of values.
    * @param mixed $columnKey The column of values to return. This value may be the
    *                         integer key of the column you wish to retrieve, or it
    *                         may be the string key name for an associative array.
    * @param mixed $indexKey (Optional.) The column to use as the index/keys for
    *                        the returned array. This value may be the integer key
    *                        of the column, or it may be the string key name.
    * @return array
    */
   function array_column($input = null, $columnKey = null, $indexKey = null){
       // Using func_get_args() in order to check for proper number of
       // parameters and trigger errors exactly as the built-in array_column()
       // does in PHP 5.5.
       $argc = func_num_args();
       $params = func_get_args();
       if ($argc < 2) {
           trigger_error("array_column() expects at least 2 parameters, {$argc} given", E_USER_WARNING);
           return array();
       }
       if (!is_array($params[0])) {
           trigger_error('array_column() expects parameter 1 to be array, ' . gettype($params[0]) . ' given', E_USER_WARNING);
           return array();
       }
       if (!is_int($params[1])
           && !is_float($params[1])
           && !is_string($params[1])
           && $params[1] !== null
           && !(is_object($params[1]) && method_exists($params[1], '__toString'))
       ) {
           trigger_error('array_column(): The column key should be either a string or an integer', E_USER_WARNING);
           return array();
       }
       if (isset($params[2])
           && !is_int($params[2])
           && !is_float($params[2])
           && !is_string($params[2])
           && !(is_object($params[2]) && method_exists($params[2], '__toString'))
       ) {
           trigger_error('array_column(): The index key should be either a string or an integer', E_USER_WARNING);
           return array();
       }
       $paramsInput = $params[0];
       $paramsColumnKey = ($params[1] !== null) ? (string) $params[1] : null; 
       $paramsIndexKey = null;
       if (isset($params[2])) {
           if (is_float($params[2]) || is_int($params[2])) {
               $paramsIndexKey = (int) $params[2];
           } else {
               $paramsIndexKey = (string) $params[2];
           }
       } 
       $resultArray = array(); 
       foreach ($paramsInput as $row) { 
           $key = $value = null;
           $keySet = $valueSet = false;

           if ($paramsIndexKey !== null && array_key_exists($paramsIndexKey, $row)) {
               $keySet = true;
               $key = (string) $row[$paramsIndexKey];
           } 
           if ($paramsColumnKey === null) {
               $valueSet = true;
               $value = $row;
           } elseif (is_array($row) && array_key_exists($paramsColumnKey, $row)) {
               $valueSet = true;
               $value = $row[$paramsColumnKey];
           } 
           if ($valueSet) {
               if ($keySet) {
                   $resultArray[$key] = $value;
               } else {
                   $resultArray[] = $value;
               }
           }
       } 
       return array_unique($resultArray);
   } 
}

public function cache($seconds_to_cache = 3600){
    $ts = gmdate("D, d M Y H:i:s", time() + $seconds_to_cache) . " GMT";
    header("Expires: $ts");
    header("Pragma: cache");
    header("Cache-Control: max-age=$seconds_to_cache");
}

 public function disCache(){
    $ts = gmdate("D, d M Y H:i:s",strtotime('-1 year')) . " GMT";
    header("Expires: $ts");
    header("Last-Modified: $ts");
    header("Pragma: no-cache");
    header("Cache-Control: no-cache, must-revalidate");
}

public function referer(){
    return $_SERVER['HTTP_REFERER'];
}

public function pageinfo(){
    $pageinfo               = new \stdClass;
    $pageinfo->length       = isset($_GET['length']) ? $_GET['length'] : $this->length;
    $pageinfo->page         = isset($_GET['page']) ? $_GET['page'] : 1;
    $pageinfo->end_id       = isset($_GET['end_id']) ? $_GET['end_id'] : 1;
    $pageinfo->offset= $pageinfo->page<=1 ? 0 : ($pageinfo->page-1) * $pageinfo->length;
    $pageinfo->totalNum     = $pageinfo->totalNum? $pageinfo->totalNum  : 0;
    $pageinfo->totalPage    = $pageinfo->totalNum / $pageinfo->length;

    return $pageinfo;