Question

我需要从最后一个回显文件中删除逗号。所以我需要从行"$aSong['ID'].'.mp3"},"中删除。在最后一个回应

while ( $aSong = mysql_fetch_array($sql_get_files) ) {
        //Creates an array of $thisSong[ID], $thisSong[Title], etc.
        // substr removes the first 4 letters of the KEY
        foreach ( $aSong as $sKey => $sValue )
            $thisSong[substr($sKey,4)] = stripslashes($sValue);
        //Ditch $thisSong for the prev value
        $aSong = $thisSong; unset($thisSong);
        $mp3r = '';
        echo '{name:"'.$aSong['Artist'].' '.$aSong['Title'].
             '",mp3:"http://domain.com/uploads/audio/'.$aSong['ID'].'.mp3"},';
}

Answer 1

while ( $aSong = mysql_fetch_array($sql_get_files) ) {
        //Creates an array of $thisSong[ID], $thisSong[Title], etc. substr removes the first 4 letters of the KEY
        foreach ( $aSong as $sKey => $sValue ) $thisSong[substr($sKey,4)] = stripslashes($sValue);
        //Ditch $thisSong for the prev value
        $aSong = $thisSong; unset($thisSong);
        $mp3r = '';
        $tmp.= '{"name":"'.$aSong['Artist'].' '.$aSong['Title'].'","mp3":"http://domain.com/uploads/audio/'.$aSong['ID'].'.mp3"},';
}
echo rtrim($tmp,',');

您也可以只填充一个数组：

$tmp_arr = array();
while ( $aSong = mysql_fetch_array($sql_get_files) ) {
        //Creates an array of $thisSong[ID], $thisSong[Title], etc. substr removes the first 4 letters of the KEY
        foreach ( $aSong as $sKey => $sValue ) $thisSong[substr($sKey,4)] = stripslashes($sValue);
        //Ditch $thisSong for the prev value
        $aSong = $thisSong; unset($thisSong);
        $mp3r = '';
        $tmp_arr[] = '{"name":"'.$aSong['Artist'].' '.$aSong['Title'].'","mp3":"http://domain.com/uploads/audio/'.$aSong['ID'].'.mp3"}';
}
echo implode(',',$tmp_arr);

您还需要引用您的JSON密钥，以便{mp3:"http...mp3"}变为{"mp3":"http...mp3"}。如果您正在尝试将JSON输出到浏览器以获取AJAX或其他任何内容，那么您需要这样的内容：

echo '{"0":[' . implode(',',$tmp_arr) . ']}';

获得所有输出后，请将其移至JSONlint.com并验证。

Answer 2

一个简单的解决方案是使用辅助变量来跟踪您是否在第一个元素。如果您在第一个元素不，请在开头括号前输出逗号。

如何从while循环中的最后一个echo中删除逗号？

2 个答案: