PHP未定义的字符?在输出 - PHP undefined chars ? in output

PHP undefined chars ? in output

本文关键字：输出字符未定义 PHP | 更新日期: 2023-09-27

我的问题是，我不知道从哪里在我的输出字符，谁能解释我为什么在我的字符串是这些字符和我做什么来取消设置它们?

函数是用来改变"a","o","u"到"ae","oe","问题"

<?php
// str      | string argument
// needle   | searched char
// val      | value
// pos      | default 0 at start at offset zero 
// pos      | momently just working with default offset
function changeLetter($str, $needle, $val, $pos = 0) {
    $mstr = "";
    while (isset($str[$pos])) {            
        if (ord($str[$pos]) == ord($needle)) {
            $mstr .= $val;
            $pos++;
        } else {
            $mstr .= $str[$pos];
            $pos++;
        }
    }
    return $mstr;
}
echo changeLetter("täp@tecmax.com", 'ä', 'ae') . '<br>';
echo changeLetter("tüp@tecmax.com", 'ü', 'ue') . '<br>';
echo changeLetter("töp@tecmax.com", 'ö', 'oe') . '<br>';

//echo changeLetter("täp@tecmax.com", 'ä', 'ae', 3) . '<br>';   
?>

输出:

tae�p@tecmax.com

星期二�p@tecmax.com

脚趾�p@tecmax.com

你可以这样做:

echo changeLetter("täp@tecmax.com", 'ä', 'ae'), PHP_EOL;
echo changeLetter("tüp@tecmax.com", 'ü', 'ue'), PHP_EOL;
echo changeLetter("töp@tecmax.com", 'ö', 'oe'), PHP_EOL;

输出

taep@tecmax.com
tuep@tecmax.com
toep@tecmax.com

使用功能

function changeLetter($str, $needle, $val, $pos = 0) {
    $next = function ($str, &$pos) {
        if (! isset($str[$pos]))
            return false;
        $char = ord($str[$pos]);
        if ($char < 128) {
            return $str[$pos ++];
        } else {
            if ($char < 224) {
                $bytes = 2;
            } elseif ($char < 240) {
                $bytes = 3;
            } elseif ($char < 248) {
                $bytes = 4;
            } elseif ($char = 252) {
                $bytes = 5;
            } else {
                $bytes = 6;
            }
            $str = substr($str, $pos, $bytes);
            $pos += $bytes;
            return $str;
        }
    };
    $mstr = "";
    while(($chr = $next($str, $pos)) !== false) {
        $mstr .= $chr == $needle ? $val : $chr;
    }
    return $mstr;
}

您需要更改您的文件编码，或者使用ä, ü, ö代替ä, ü, ö。