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function strlen ($str)    
{    
        if ($str == '' ) return 0;    
        $count =  0;    
        while (1){    
                if ( $str[$count] != NULL){    
                         $count++;    
                        continue;    
                }else{    
                        break;    
                }    
        }    
        return $count;    
}    
   
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function substr($str, $start,  $length=NULL)    
{    
        if ($str== '' || $start>strlen($str )) return;    
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<?php
$a = 1;
function b(&$c)
{
$c++;
return $c;
}
$d=b($a); // d = 2; a = 2;
$d++; // d = 2;
echo($a); // ÏÔʾ2
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$a = 1;
function &b(&$c)
{
$c++;
return $c;
}
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<?PHP
/**
* HTTP Protocol defined status codes
* @param int $num
*/
function https($num) {
$http = array (
100 => "HTTP/1.1 100 Continue",
101 => "HTTP/1.1 101 Switching Protocols",
200 => "HTTP/1.1 200 OK",
201 => "HTTP/1.1 201 Created",
202 => "HTTP/1.1 202 ......
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