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
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<?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; } $this->buf = ''; }} // class end?> |
demo.php
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<?phprequire 'RestorePrint.class.php';$print_r_data = <<<TXTArray( [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)
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
