PHP print_r方法可以把变量打印显示，使变量易于理解。如果变量是string,integer或float，将打印变量值本身，如果变量是array，将会按照一定格式显示键和元素。object与数组类似。print_r用于打印数组较多。

php原生没有把print_r方法打印后的数据还原为原始数组，因此写了下面这个方法，实现将print_r处理后的数据还原为原始数组。

RestorePrint.class.php

<?php
/**
 * 将print_r处理后的数据还原为原始数组
 * Date:  2016-10-31
 * Author: fdipzone
 * Ver:   1.0
 */
class RestorePrint{ // class start

  public $res = array();
  protected $dict = array();
  protected $buf = '';
  protected $keyname = '';
  protected $stack = array();

  public function __construct() {
    $this->stack[] =& $this->res;
  }

  public function __call($method, $param){
    echo $this->buf .' not defined mehtod:'.$method. ' param:'.implode(',', $param);
  }

  public function set($word, $value=''){
    if(is_array($word)){
      foreach($word as $k=>$v){
        $this->set($k, $v);
      }
    }
    $p =& $this->dict;
    foreach(str_split($word) as $ch){
      if(!isset($p[$ch])){
        $p[$ch] = array();
      }
      $p =& $p[$ch];
    }
    $p['val'] = $value;
    return $this;
  }

  public function parse($str){
    $this->doc = $str;
    $this->len = strlen($str);
    $i = 0;
    while($i < $this->len){
      $t = $this->find($this->dict, $i);
      if($t){
        $i = $t;
        $this->buf = '';
      }else{
        $this->buf .= $this->doc{$i++};
      }
    }
  }

  protected function find(&$p, $i){
    if($i >= $this->len){
      return $i;
    }
    $t = 0;
    $n = $this->doc{$i};
    if(isset($p[$n])){
      $t = $this->find($p[$n], $i+1);
    }
    if($t){
      return $t;
    }
    if(isset($p['val'])){
      $arr = explode(',', $p['val']);
      call_user_func_array(array($this, array_shift($arr)), $arr);
      return $i;
    }
    return $t;
  }

  protected function group(){
    if(!$this->keyname){
      return ;
    }
    $cnt = count($this->stack)-1;
    $this->stack[$cnt][$this->keyname] = array();
    $this->stack[] =& $this->stack[$cnt][$this->keyname];
    $this->keyname = '';
  }

  protected function brackets($c){
    $cnt = count($this->stack)-1;
    switch($c){
      case ')':
        if($this->keyname){
          $this->stack[$cnt][$this->keyname] = trim($this->buf);
        }
        $this->keyname = '';
        array_pop($this->stack);
        break;

      case '[':
        if($this->keyname){
          $this->stack[$cnt][$this->keyname] = trim($this->buf);
        }
        break;

      case ']':
        $this->keyname = $this->buf;
        break;
    }
    $this->buf = '';
  }

} // class end
?>

demo.php

<?php
require 'RestorePrint.class.php';

$print_r_data = <<<TXT
Array
(
  [name] => fdipzone
  [gender] => male
  [age] => 18
  [profession] => programmer
  [detail] => Array(
    [grade] => 1
    [addtime] => 2016-10-31
  )
)
TXT;

// 显示打印的数据
echo '显示打印的数据<br>';
echo '<pre>'.$print_r_data.'</pre>';

$oRestorePrint = new RestorePrint;
$oRestorePrint->set('Array', 'group');
$oRestorePrint->set(' [', 'brackets,[');
$oRestorePrint->set('] => ', 'brackets,]');
$oRestorePrint->set(')', 'brackets,)');

$oRestorePrint->parse($print_r_data);
$result = $oRestorePrint->res;

echo '还原为数组<br>';
var_dump($result);

?>

输出：

显示打印的数据

Array
(
[name] => fdipzone
[gender] => male
[age] => 18
[profession] => programmer
[detail] => Array(
[grade] => 1
[addtime] => 2016-10-31
)
)

还原为数组

array (size=5)
'name' => string 'fdipzone' (length=8)
'gender' => string 'male' (length=4)
'age' => string '18' (length=2)
'profession' => string 'programmer' (length=10)
'detail' =>
array (size=2)
'grade' => string '1' (length=1)
'addtime' => string '2016-10-31' (length=10)

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