PHP ASCII碼與字符串的相互轉(zhuǎn)換的例子：

下文小編為各位來(lái)介紹一篇關(guān)于PHP ASCII碼與字符串的相互轉(zhuǎn)換的例子，希望php 批量ascii轉(zhuǎn)字符串例子能夠?qū)Ω魑挥袔椭?/p>

class ascii {
/**
* 將ascii碼轉(zhuǎn)為字符串
* @param type $str 要解碼的字符串
* @param type $prefix 前綴，默認(rèn):&#
* @return type
*/
function decode($str, $prefix="&#") {
$str = str_replace($prefix, "", $str);
$a = explode(";", $str);
foreach ($a as $dec) {
if ($dec < 128) {
$utf .= chr($dec);
} else if ($dec < 2048) {
$utf .= chr(192 + (($dec - ($dec % 64)) / 64));
$utf .= chr(128 + ($dec % 64));
} else {
$utf .= chr(224 + (($dec - ($dec % 4096)) / 4096));
$utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64));
$utf .= chr(128 + ($dec % 64));
}
}
return $utf;
}
/**
* 將字符串轉(zhuǎn)換為ascii碼
* @param type $c 要編碼的字符串
* @param type $prefix 前綴，默認(rèn)：&#
* @return string
*/
function encode($c, $prefix="&#") {
$len = strlen($c);
$a = 0;
while ($a < $len) {
$ud = 0;
if (ord($c{$a}) >= 0 && ord($c{$a}) <= 127) {
$ud = ord($c{$a});
$a += 1;
} else if (ord($c{$a}) >= 192 && ord($c{$a}) <= 223) {
$ud = (ord($c{$a}) - 192) * 64 + (ord($c{$a + 1}) - 128);
$a += 2;
} else if (ord($c{$a}) >= 224 && ord($c{$a}) <= 239) {
$ud = (ord($c{$a}) - 224) * 4096 + (ord($c{$a + 1}) - 128) * 64 + (ord($c{$a + 2}) - 128);
$a += 3;
} else if (ord($c{$a}) >= 240 && ord($c{$a}) <= 247) {
$ud = (ord($c{$a}) - 240) * 262144 + (ord($c{$a + 1}) - 128) * 4096 + (ord($c{$a + 2}) - 128) * 64 + (ord($c{$a + 3}) - 128);
$a += 4;
} else if (ord($c{$a}) >= 248 && ord($c{$a}) <= 251) {
$ud = (ord($c{$a}) - 248) * 16777216 + (ord($c{$a + 1}) - 128) * 262144 + (ord($c{$a + 2}) - 128) * 4096 + (ord($c{$a + 3}) - 128) * 64 + (ord($c{$a + 4}) - 128);
$a += 5;
} else if (ord($c{$a}) >= 252 && ord($c{$a}) <= 253) {
56 $ud = (ord($c{$a}) - 252) * 1073741824 + (ord($c{$a + 1}) - 128) * 16777216 + (ord($c{$a + 2}) - 128) * 262144 + (ord($c{$a + 3}) - 128) * 4096 + (ord($c{$a + 4}) - 128) * 64 + (ord($c{$a + 5}) - 128);
$a += 6;
} else if (ord($c{$a}) >= 254 && ord($c{$a}) <= 255) { //error
$ud = false;
}
$scill .= $prefix.$ud.";";
}
return $scill;
}
}
/*
PHP 轉(zhuǎn) ASCII
require_once "ascii_class.php";
*/
$aa = new ascii;
echo "

&quot;;&lt;/p&gt; &lt;p&gt;echo $str = $aa-&gt;encode(&quot;PHP二次開(kāi)發(fā)：www.php2.cc&quot;);&lt;/p&gt; &lt;p&gt;echo &quot;";
 
echo $aa->decode($str);
?>

以上就是PHP ASCII碼與字符串的相互轉(zhuǎn)換的例子的內(nèi)容，更多相關(guān)內(nèi)容請(qǐng)關(guān)注PHP中文網(wǎng)（www.miracleart.cn）！