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// PHPÄÚÖÃ×Ö·û´®º¯ÊýʵÏÖ     
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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,  $length=NULL)    
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        if ($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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<?php
$a = 1;
function &b(&$c)
{
$c++;
return $c;
}
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