refer:http://www.php230.com/1410667081.html
<code><span><span><?php </span><span>/**
* byte数组与字符串转化类
*/</span><span><span>class</span><span>Bytes</span> {</span><span>/**
* 转换一个String字符串为byte数组
*<span> @param</span> $str 需要转换的字符串
*<span> @param</span> $bytes 目标byte数组
*<span> @author</span> Zikie
*/</span><span>public</span><span>static</span><span><span>function</span><span>getBytes</span><span>(<span>$string</span>)</span> {</span><span>$bytes</span> = <span>array</span>();
<span>for</span>(<span>$i</span> = <span>0</span>; <span>$i</span> $string</span>); <span>$i</span>++){
<span>$bytes</span>[] = ord(<span>$string</span>[<span>$i</span>]);
}
<span>return</span><span>$bytes</span>;
}
<span>/**
* 将字节数组转化为String类型的数据
*<span> @param</span> $bytes 字节数组
*<span> @param</span> $str 目标字符串
*<span> @return</span> 一个String类型的数据
*/</span><span>public</span><span>static</span><span><span>function</span><span>toStr</span><span>(<span>$bytes</span>)</span> {</span><span>$str</span> = <span>''</span>;
<span>foreach</span>(<span>$bytes</span><span>as</span><span>$ch</span>) {
<span>$str</span> .= chr(<span>$ch</span>);
}
<span>return</span><span>$str</span>;
}
<span>/**
* 转换一个int为byte数组
*<span> @param</span> $byt 目标byte数组
*<span> @param</span> $val 需要转换的字符串
*
*/</span><span>public</span><span>static</span><span><span>function</span><span>integerToBytes</span><span>(<span>$val</span>)</span> {</span><span>$byt</span> = <span>array</span>();
<span>$byt</span>[<span>0</span>] = (<span>$val</span> & <span>0xff</span>);
<span>$byt</span>[<span>1</span>] = (<span>$val</span> >> <span>8</span> & <span>0xff</span>);
<span>$byt</span>[<span>2</span>] = (<span>$val</span> >> <span>16</span> & <span>0xff</span>);
<span>$byt</span>[<span>3</span>] = (<span>$val</span> >> <span>24</span> & <span>0xff</span>);
<span>return</span><span>$byt</span>;
}
<span>/**
* 从字节数组中指定的位置读取一个Integer类型的数据
*<span> @param</span> $bytes 字节数组
*<span> @param</span> $position 指定的开始位置
*<span> @return</span> 一个Integer类型的数据
*/</span><span>public</span><span>static</span><span><span>function</span><span>bytesToInteger</span><span>(<span>$bytes</span>, <span>$position</span>)</span> {</span><span>$val</span> = <span>0</span>;
<span>$val</span> = <span>$bytes</span>[<span>$position</span> + <span>3</span>] & <span>0xff</span>;
<span>$val</span> 8</span>;
<span>$val</span> |= <span>$bytes</span>[<span>$position</span> + <span>2</span>] & <span>0xff</span>;
<span>$val</span> 8;
<span>$val</span> |= <span>$bytes</span>[<span>$position</span> + <span>1</span>] & <span>0xff</span>;
<span>$val</span> 8;
<span>$val</span> |= <span>$bytes</span>[<span>$position</span>] & <span>0xff</span>;
<span>return</span><span>$val</span>;
}
<span>/**
* 转换一个shor字符串为byte数组
*<span> @param</span> $byt 目标byte数组
*<span> @param</span> $val 需要转换的字符串
*
*/</span><span>public</span><span>static</span><span><span>function</span><span>shortToBytes</span><span>(<span>$val</span>)</span> {</span><span>$byt</span> = <span>array</span>();
<span>$byt</span>[<span>0</span>] = (<span>$val</span> & <span>0xff</span>);
<span>$byt</span>[<span>1</span>] = (<span>$val</span> >> <span>8</span> & <span>0xff</span>);
<span>return</span><span>$byt</span>;
}
<span>/**
* 从字节数组中指定的位置读取一个Short类型的数据。
*<span> @param</span> $bytes 字节数组
*<span> @param</span> $position 指定的开始位置
*<span> @return</span> 一个Short类型的数据
*/</span><span>public</span><span>static</span><span><span>function</span><span>bytesToShort</span><span>(<span>$bytes</span>, <span>$position</span>)</span> {</span><span>$val</span> = <span>0</span>;
<span>$val</span> = <span>$bytes</span>[<span>$position</span> + <span>1</span>] & <span>0xFF</span>;
<span>$val</span> = <span>$val</span> 8;
<span>$val</span> |= <span>$bytes</span>[<span>$position</span>] & <span>0xFF</span>;
<span>return</span><span>$val</span>;
}
}
<span>?></span></code>以上就介绍了PHP字符串与字节转换示例，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。
