PHP如何把字符串改成UTF8？
在PHP中可以使用“iconv()”函数把字符串改成UTF8，该函数作用是将字符串按要求的字符编码来转换，其语法为“iconv(in,out,str)”，使用时将in设置为字符串的编码，out设置为UTF8，str设置为要转换的字符串即可。
转化示例
$str = "123456789";
$str = iconv('ASCII', 'UTF8', $str);使用示例
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<?php
//some German
$utf8_sentence = 'Weiß, Goldmann, Göbel, Weiss, Göthe, Goethe und Götz';
//UK
setlocale(LC_ALL, 'en_GB');
//transliterate
$trans_sentence = iconv('UTF-8', 'ASCII//TRANSLIT', $utf8_sentence);
//gives [Weiss, Goldmann, Gobel, Weiss, Gothe, Goethe und Gotz]
//which is our original string flattened into 7-bit ASCII as
//an English speaker would do it (ie. simply remove the umlauts)
echo $trans_sentence . PHP_EOL;
//Germany
setlocale(LC_ALL, 'de_DE');
$trans_sentence = iconv('UTF-8', 'ASCII//TRANSLIT', $utf8_sentence);
//gives [Weiss, Goldmann, Goebel, Weiss, Goethe, Goethe und Goetz]
//which is exactly how a German would transliterate those
//umlauted characters if forced to use 7-bit ASCII!
//(because really ä = ae, ö = oe and ü = ue)
echo $trans_sentence . PHP_EOL;
?><?php
$tab = array("UTF-8", "ASCII", "Windows-1252", "ISO-8859-15", "ISO-8859-1", "ISO-8859-6", "CP1256");
$chain = "";
foreach ($tab as $i)
{
foreach ($tab as $j)
{
$chain .= " $i$j ".iconv($i, $j, "$my_string");
}
}
echo $chain;
?>推荐教程：《PHP教程》
