PHP ASCII碼與字符串相互轉(zhuǎn)換的方法
PHP ASCII碼與字符串如何相互轉(zhuǎn)換你知道嗎？你對PHP ASCII碼與字符串相互轉(zhuǎn)換了解嗎？下面是小編為大家?guī)淼腜HP ASCII碼與字符串相互轉(zhuǎn)換的方法，歡迎閱讀。
PHP ASCII碼與字符串相互轉(zhuǎn)換
php代碼：
<?php
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 "<xmp>";
echo $str = $aa->encode("PHP二次開發(fā)：www.php2.cc");
echo "</xmp>";
echo $aa->decode($str);
?>
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