<code><span>$ipArr</span> = explode(<span>'.'</span>,<span>$_SERVER</span>[<span>'REMOTE_ADDR'</span>]); <span>$ipVal</span> = <span>$ipArr</span>[<span>0</span>] * <span>0x1000000</span> + <span>$ipArr</span>[<span>1</span>] * <span>0x10000</span> + <span>$ipArr</span>[<span>2</span>] * <span>0x100</span> + <span>$ipArr</span>[<span>3</span>] ; <span>echo</span><span>$ipVal</span>.<span>'<br>'</span>; <span>$ipArr</span> = <span>array</span>(<span>0</span> => floor( <span>$ipVal</span>/ <span>0x1000000</span>) ); <span>$ipVint</span> = <span>$ipVal</span>-(<span>$ipArr</span>[<span>0</span>]*<span>0x1000000</span>); <span>// for clarity</span><span>$ipArr</span>[<span>1</span>] = (<span>$ipVint</span> & <span>0xFF0000</span>) >> <span>16</span>; <span>$ipArr</span>[<span>2</span>] = (<span>$ipVint</span> & <span>0xFF00</span> ) >> <span>8</span>; <span>$ipArr</span>[<span>3</span>] = <span>$ipVint</span> & <span>0xFF</span>; <span>$ipDotted</span> = implode(<span>'.'</span>, <span>$ipArr</span>); <span>echo</span><span>$ipDotted</span>; <span><?php </span><span>$ipArr</span> = explode(<span>'.'</span>,<span>$_SERVER</span>[<span>'REMOTE_ADDR'</span>]); <span>$ip</span> = <span>$ipArr</span>[<span>0</span>] * <span>0x1000000</span> + <span>$ipArr</span>[<span>1</span>] * <span>0x10000</span> + <span>$ipArr</span>[<span>2</span>] * <span>0x100</span> + <span>$ipArr</span>[<span>3</span>] ; <span>?></span>This can be written in a bit more efficient way: <span><?php </span><span>$ipArr</span> = explode(<span>'.'</span>,<span>$_SERVER</span>[<span>'REMOTE_ADDR'</span>]); <span>$ip</span> = <span>$ipArr</span>[<span>0</span>]24</span> + <span>$ipArr</span>[<span>1</span>]16</span> + <span>$ipArr</span>[<span>2</span>] 8 + <span>$ipArr</span>[<span>3</span>] ; <span>?></span>shift is more cheaper.</code>
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