<code>class Trie {
protected $dict = array();
protected $buf = '';
function set($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 $this;
}
function parse($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']) ) {
$ar = explode(',', $p['val']);
call_user_func_array( array($this, array_shift($ar)), $ar );
return $i;
}
return $t;
}
function __call($method, $param) {
echo "****\n$this->buf 未定义方法:$method 参数:" . join(',', $param) . "<br />\n";
}
}
class App extends Trie {
public $res = array();
protected $stack = array();
protected $keyname = '';
protected $buf = '';
function __construct() {
$this->stack[] =& $this->res;
}
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;
}
$this->buf = '';
}
}</code>這段程式碼我在幾個範例中看到，原始的出處不知道，它是如何實現print_r 的顯示成數組呢？求註釋，謝謝！
中間常用的是&，來回幾個我就暈了。
<code>class Trie {
protected $dict = array();
protected $buf = '';
function set($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 $this;
}
function parse($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']) ) {
$ar = explode(',', $p['val']);
call_user_func_array( array($this, array_shift($ar)), $ar );
return $i;
}
return $t;
}
function __call($method, $param) {
echo "****\n$this->buf 未定义方法:$method 参数:" . join(',', $param) . "<br />\n";
}
}
class App extends Trie {
public $res = array();
protected $stack = array();
protected $keyname = '';
protected $buf = '';
function __construct() {
$this->stack[] =& $this->res;
}
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;
}
$this->buf = '';
}
}</code>這段程式碼我在幾個範例中看到，原始的出處不知道，它是如何實現print_r 的顯示成數組呢？求註釋，謝謝！
中間常用的是&，來回幾個我就暈了。
&代表引用，如
<code class="php">$a = &$b;</code>
就代表$a和$b是同一個引用，修改$a也會修改$b的值，修改$b也影響$a的值，修改$b也影響$a。不加上&就代表把
的值複製一份給$a，兩者都是獨立的。
而函數（方法）的參數列表裡加上&，就代表按引用傳遞了，不加就是按值傳遞，這是程式設計的基本概念，不用多說了吧。
要注意的是物件類型，不管加不加
&
都是引用。 🎜 🎜 🎜看看這個🎜
