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$data = array('a' => 'data1', 'b' => 'data2', 'c' => 'data3'); 
while(list($subscript, $value) = each($data)) 

   echo "$subscript => $value :: "; 
   echo "$subscript => $value <br>"; 
}
reset($data); 
foreach($data as $subscript => $value) 

   echo "$subscript => $value :: "; 
   echo "$subscript => $value <br>"; 

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<?php
//±äÁ¿µÄ±äÁ¿
$var = "this is a var";
$varname = "var";
echo $$varname;
//º¯ÊýµÄ±äÁ¿
function fun1($str) {
echo $str;
}
$funname = "fun1";
$funname("This is a function !");
?> 
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<?php
function($a) {
$a ++;
}
$c = 0;
function($c);
echo $c; //$cÈÔΪ0
function(&$a) {
$a ++;
}
$c = 0;
echo $c; //$cΪ1
?> 
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/*
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header('HTTP/1.1 200 OK');
//ÉèÖÃÒ»¸ö404Í·:
header('HTTP/1.1 404 Not Found');
//ÉèÖõØÖ·±»ÓÀ¾ÃµÄÖØ¶¨Ïò
header('HTTP/1.1 301 Moved Permanently');
//תµ½Ò»¸öеØÖ·
header('Location: http://www.example.org/'
);
//ÎļþÑÓ³ÙתÏò:
header('Refresh: 10; url=http://www.example.org/');
print 'Y ......

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counter1.phpÎļþ´úÂë
<?php
$fp = fopen("counter.txt","r");

if ($str1==false){
$str1 = 0;
}
$str1 = fgets($fp,10);
$str1++;
fclose($fp);

$fp = ......
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