将PHP字符串中两个字符之间的数字相乘

Posted 2023-02-24

【中文标题】将PHP字符串中两个字符之间的数字相乘

【英文标题】：Multiply the number between two characters in PHP string

【发布时间】：2020-08-16 17:15:16

【问题描述】：

请查看最后的 EDIT。

我正在从外部 URL 解析无效的 json 数据，并且我想修改特定键的值。 我想将值与特定键（分）的值相乘。

如果你仔细观察，模式会重复，它以“vk”开头。

如何将“cent”的值与常数 (0.887) 相乘。

我从外部 URL 解析的示例数据如下所示：

"0":"vk":"cent":21,"bank":1453,"ok":"cent":4,"bank":2581,"wa":"cent":4.5,"bank":959,"vi":"cent":4,"bank":0,"tg":"cent":4.5,"bank":0,"wb":"cent":14,"bank":6733,"go":"cent":5.5,"bank":149,"av":"cent":2.5,"bank":2139,"av_1":"cent":59,"bank":0,"fb":"cent":3,"bank":84,"tw":"cent":2,"bank":3848,"ot_1":"cent":59,"bank":0,"ub":"cent":1,"bank":4042,"gt":"cent":1,"bank":6835,"ig":"cent":5,"bank":3094,"ym":"cent":2,"bank":16,"ym_1":"cent":59,"bank":0,"ma":"cent":1,"bank":5282,"mm":"cent":2,"bank":0,"uk":"cent":2,"bank":7097,"mb":"cent":2.5,"bank":2694,"we":"cent":1,"bank":7010,"bd":"cent":13,"bank":0,"dt":"cent":2,"bank":5592,"ya":"cent":2,"bank":3811,"ya_1":"cent":59,"bank":0,"mt":"cent":4,"bank":6468,"oi":"cent":1.25,"bank":1200,"fd":"cent":1,"bank":5505,"zz":"cent":2,"bank":7097,"kt":"cent":1.5,"bank":6585,"pm":"cent":1.5,"bank":983,"tn":"cent":1,"bank":7112,"qq":"cent":2,"bank":5796,"mg":"cent":1,"bank":2260,"yl":"cent":1,"bank":5950,"po":"cent":2,"bank":5645,"nv":"cent":2,"bank":3378,"nf":"cent":2,"bank":6210,"im":"cent":1.5,"bank":217,"ds":"cent":1.25,"bank":5796,"vv":"cent":1,"bank":6685,"lf":"cent":1.5,"bank":6582,"gp":"cent":1.5,"bank":6682,"am":"cent":1,"bank":6674,"tc":"cent":1,"bank":6683,"dp":"cent":1,"bank":6324,"yf":"cent":2,"bank":6587,"op":"cent":2,"bank":6331,"fx":"cent":2,"bank":6525,"qr":"cent":2,"bank":6664,"yk":"cent":2,"bank":6650,"ls":"cent":2,"bank":6668,"bl":"cent":2,"bank":6025,"mu":"cent":2,"bank":6627,"fu":"cent":2,"bank":6666,"sg":"cent":2,"bank":6387,"uu":"cent":2,"bank":6678,"ua":"cent":2,"bank":6357,"ab":"cent":2,"bank":6127,"iv":"cent":2,"bank":6685,"fy":"cent":2,"bank":6351,"ce":"cent":2,"bank":6279,"hm":"cent":2,"bank":6317,"tx":"cent":2,"bank":6669,"pl":"cent":2,"bank":6682,"ip":"cent":2,"bank":6314,"hw":"cent":2,"bank":6085,"de":"cent":1,"bank":6548,"jc":"cent":2,"bank":6683,"rl":"cent":2,"bank":6594,"df":"cent":2,"bank":6353,"ui":"cent":1.5,"bank":6633,"up":"cent":2,"bank":6670,"kf":"cent":1,"bank":6685,"za":"cent":2,"bank":6683,"da":"cent":3,"bank":5469,"sq":"cent":2,"bank":6685,"li":"cent":2,"bank":6486,"rd":"cent":2,"bank":6650,"qb":"cent":2,"bank":6685,"hz":"cent":2,"bank":6684,"ia":"cent":2,"bank":6685,"ew":"cent":1.5,"bank":6681,"ae":"cent":1,"bank":6654,"gb":"cent":1,"bank":6681,"cy":"cent":3,"bank":5642,"qm":"cent":2.5,"bank":6684,"yb":"cent":2.5,"bank":6761,"ot":"cent":2.5,"bank":0"1":"vk":"cent":21,"bank":6,"ok":"cent":5,"bank":1594,"wa":"cent":8,"bank":0,"vi":"cent":7,"bank":3,"tg":"cent":8,"bank":0,"wb":"cent":15,"bank":952,"go":"cent":10,"bank":2,"av":"cent":4,"bank":1517,"fb":"cent":3.5,"bank":3,"tw":"cent":2,"bank":453,"ub":"cent":2,"bank":610,"gt":"cent":1,"bank":1511,"sn":"cent":40,"bank":693,"ig":"cent":6,"bank":0,"ss":"cent":1,"bank":1516,"ym":"cent":2,"bank":1434,"ma":"cent":1,"bank":1140,"mm":"cent":2,"bank":0,"uk":"cent":2,"bank":1447,"me":"cent":1,"bank":1516,"mb":"cent":2.5,"bank":262,"we":"cent":1,"bank":1517,"bd":"cent":1,"bank":1509,"kp":"cent":2,"bank":1466,"dt":"cent":1,"bank":1515,"ya":"cent":1,"bank":558,"mt":"cent":4,"bank":1923,"oi":"cent":2,"bank":474,"fd":"cent":2,"bank":1448,"zz":"cent":2,"bank":1509,"kt":"cent":2,"bank":580,"pm":"cent":1.5,"bank":1,"tn":"cent":1,"bank":1499,"qq":"cent":2,"bank":1022,"yl":"cent":1,"bank":1459,"po":"cent":6,"bank":1478,"nv":"cent":6,"bank":611,"nf":"cent":6,"bank":1334,"im":"cent":2,"bank":188,"ds":"cent":1.5,"bank":187,"vv":"cent":2,"bank":1453,"ji":"cent":2,"bank":998,"lf":"cent":2,"bank":1470,"hu":"cent":6,"bank":854,"wg":"cent":4,"bank":991,"rz":"cent":2,"bank":1408,"la":"cent":6,"bank":1477,"zh":"cent":1,"bank":1430,"gp":"cent":1.5,"bank":1458,"ls":"cent":6,"bank":1478,"zy":"cent":6,"bank":1476,"tx":"cent":6,"bank":1260,"cm":"cent":6,"bank":1384,"hw":"cent":6,"bank":853,"ri":"cent":9,"bank":1476,"za":"cent":2,"bank":1453,"gl":"cent":3,"bank":1366,"dh":"cent":4,"bank":1409,"ot":"cent":6,"bank":519

我试过的代码：

$json = get_content('tld.xyz/json.php?bank=prices'); 
$data = json_decode($json, true); 
foreach ($decoded_json['cent'] as &$value) 
 if ($value >= 0) $value = $value * 0.887; $result[]=$value;   
$fin = json_encode($data); 
echo $fin;

编辑：我认为它不是 json，可以通过使用正则表达式来解决。我正在考虑找到 : 和 , 之间的字符串，以及如何将此数字与我的常数相乘。

感谢任何帮助。我不是网络开发人员，但我有一个小项目，我想自己解决这个问题，而不是雇人。

谢谢。

【问题讨论】：

我能够提取和解码 json，但我需要搜索键的值并进行乘法运算。我已经看到很多类似的问题，但我的不同。

我尝试了这段代码，因为它看起来和我的问题相似，但我得到的结果仍然是一样的。 ***.com/a/38880531/9488870 我使用的代码： $json = get_content('tld.xyz/json.json'); $data = json_decode($json, true); foreach ($decoded_json['cost'] as &$value) if ($value >= 0) $value = $value * 2; $结果[]=$值； $fin = json_encode($data);回声 $fin;

/cent":(\d*),/ (flags gm) 这是您需要的正则表达式，以便将您的号码捕获到组 $1 - 然后使用 preg_replace。抱歉在手机上，所以我不能写完整的答案（我可以，但是太痛苦了，很难输入正则表达式！）。

您的 get_content 多次也是您的 JSON 无效的原因。您可能最好在每次调用 JSON 时将其转换为数组并合并数组（然后您可以在 PHP 中操作数据），然后恢复为 JSON。

嗨，mdhz - 我还在学习 php。不过有一个问题：bestprogrammerintheworld 的解决方案终于做到了——它对你有用吗？很高兴收到您的来信

【参考方案1】：

<?php
$json = '"0":"vk":"cent":21,"bank":1453,"ok":"cent":4,"bank":2581,"wa":"cent":4.5,"bank":959,"vi":"cent":4,"bank":0,"tg":"cent":4.5,"bank":0,"wb":"cent":14,"bank":6733,"go":"cent":5.5,"bank":149,"av":"cent":2.5,"bank":2139,"av_1":"cent":59,"bank":0,"fb":"cent":3,"bank":84,"tw":"cent":2,"bank":3848,"ot_1":"cent":59,"bank":0,"ub":"cent":1,"bank":4042,"gt":"cent":1,"bank":6835,"ig":"cent":5,"bank":3094,"ym":"cent":2,"bank":16,"ym_1":"cent":59,"bank":0,"ma":"cent":1,"bank":5282,"mm":"cent":2,"bank":0,"uk":"cent":2,"bank":7097,"mb":"cent":2.5,"bank":2694,"we":"cent":1,"bank":7010,"bd":"cent":13,"bank":0,"dt":"cent":2,"bank":5592,"ya":"cent":2,"bank":3811,"ya_1":"cent":59,"bank":0,"mt":"cent":4,"bank":6468,"oi":"cent":1.25,"bank":1200,"fd":"cent":1,"bank":5505,"zz":"cent":2,"bank":7097,"kt":"cent":1.5,"bank":6585,"pm":"cent":1.5,"bank":983,"tn":"cent":1,"bank":7112,"qq":"cent":2,"bank":5796,"mg":"cent":1,"bank":2260,"yl":"cent":1,"bank":5950,"po":"cent":2,"bank":5645,"nv":"cent":2,"bank":3378,"nf":"cent":2,"bank":6210,"im":"cent":1.5,"bank":217,"ds":"cent":1.25,"bank":5796,"vv":"cent":1,"bank":6685,"lf":"cent":1.5,"bank":6582,"gp":"cent":1.5,"bank":6682,"am":"cent":1,"bank":6674,"tc":"cent":1,"bank":6683,"dp":"cent":1,"bank":6324,"yf":"cent":2,"bank":6587,"op":"cent":2,"bank":6331,"fx":"cent":2,"bank":6525,"qr":"cent":2,"bank":6664,"yk":"cent":2,"bank":6650,"ls":"cent":2,"bank":6668,"bl":"cent":2,"bank":6025,"mu":"cent":2,"bank":6627,"fu":"cent":2,"bank":6666,"sg":"cent":2,"bank":6387,"uu":"cent":2,"bank":6678,"ua":"cent":2,"bank":6357,"ab":"cent":2,"bank":6127,"iv":"cent":2,"bank":6685,"fy":"cent":2,"bank":6351,"ce":"cent":2,"bank":6279,"hm":"cent":2,"bank":6317,"tx":"cent":2,"bank":6669,"pl":"cent":2,"bank":6682,"ip":"cent":2,"bank":6314,"hw":"cent":2,"bank":6085,"de":"cent":1,"bank":6548,"jc":"cent":2,"bank":6683,"rl":"cent":2,"bank":6594,"df":"cent":2,"bank":6353,"ui":"cent":1.5,"bank":6633,"up":"cent":2,"bank":6670,"kf":"cent":1,"bank":6685,"za":"cent":2,"bank":6683,"da":"cent":3,"bank":5469,"sq":"cent":2,"bank":6685,"li":"cent":2,"bank":6486,"rd":"cent":2,"bank":6650,"qb":"cent":2,"bank":6685,"hz":"cent":2,"bank":6684,"ia":"cent":2,"bank":6685,"ew":"cent":1.5,"bank":6681,"ae":"cent":1,"bank":6654,"gb":"cent":1,"bank":6681,"cy":"cent":3,"bank":5642,"qm":"cent":2.5,"bank":6684,"yb":"cent":2.5,"bank":6761,"ot":"cent":2.5,"bank":0"1":"vk":"cent":21,"bank":6,"ok":"cent":5,"bank":1594,"wa":"cent":8,"bank":0,"vi":"cent":7,"bank":3,"tg":"cent":8,"bank":0,"wb":"cent":15,"bank":952,"go":"cent":10,"bank":2,"av":"cent":4,"bank":1517,"fb":"cent":3.5,"bank":3,"tw":"cent":2,"bank":453,"ub":"cent":2,"bank":610,"gt":"cent":1,"bank":1511,"sn":"cent":40,"bank":693,"ig":"cent":6,"bank":0,"ss":"cent":1,"bank":1516,"ym":"cent":2,"bank":1434,"ma":"cent":1,"bank":1140,"mm":"cent":2,"bank":0,"uk":"cent":2,"bank":1447,"me":"cent":1,"bank":1516,"mb":"cent":2.5,"bank":262,"we":"cent":1,"bank":1517,"bd":"cent":1,"bank":1509,"kp":"cent":2,"bank":1466,"dt":"cent":1,"bank":1515,"ya":"cent":1,"bank":558,"mt":"cent":4,"bank":1923,"oi":"cent":2,"bank":474,"fd":"cent":2,"bank":1448,"zz":"cent":2,"bank":1509,"kt":"cent":2,"bank":580,"pm":"cent":1.5,"bank":1,"tn":"cent":1,"bank":1499,"qq":"cent":2,"bank":1022,"yl":"cent":1,"bank":1459,"po":"cent":6,"bank":1478,"nv":"cent":6,"bank":611,"nf":"cent":6,"bank":1334,"im":"cent":2,"bank":188,"ds":"cent":1.5,"bank":187,"vv":"cent":2,"bank":1453,"ji":"cent":2,"bank":998,"lf":"cent":2,"bank":1470,"hu":"cent":6,"bank":854,"wg":"cent":4,"bank":991,"rz":"cent":2,"bank":1408,"la":"cent":6,"bank":1477,"zh":"cent":1,"bank":1430,"gp":"cent":1.5,"bank":1458,"ls":"cent":6,"bank":1478,"zy":"cent":6,"bank":1476,"tx":"cent":6,"bank":1260,"cm":"cent":6,"bank":1384,"hw":"cent":6,"bank":853,"ri":"cent":9,"bank":1476,"za":"cent":2,"bank":1453,"gl":"cent":3,"bank":1366,"dh":"cent":4,"bank":1409,"ot":"cent":6,"bank":519';

//JSON supplied is not valid, it misses [] at the beginning and the end
//and it also misses a comma between the keys which is solved by next two lines
$json = str_replace("",",", $json);
$valid_json = '[' . $json . ']';

$data = json_decode($valid_json, true); 

//Copy the current data into new array $na
$na = array_slice($data,0,count($data));

//Change the copy of array $data with cents
foreach($data as $top_key=>$value) 
    $level_arr = $na[$top_key][$top_key];    
    foreach($level_arr as $key=>$item) 
        if ($na[$top_key][$top_key][$key]['cent']>0) 
            $na[$top_key][$top_key][$key]['cent'] = $data[$top_key][$top_key][$key]['cent'] * 0.087;
        
    


//JSON
echo json_encode($na);

更新1：

您可以删除 if ($na[$top_key][$top_key][$key]['cent']>0) - 部分。

//Change the copy of array $data with cents
foreach($data as $top_key=>$value) 
    $level_arr = $na[$top_key][$top_key];    
    foreach($level_arr as $key=>$item) 
            $na[$top_key][$top_key][$key]['cent'] = $data[$top_key][$top_key][$key]['cent'] * 0.087; 
    


//JSON
echo json_encode($na);

更新 2：

以上要求数组的层级为：

[0][0][whatever key]['cent]
[1][1][whatever key]['cent]
[2][2][whatever key]['cent]

如果您想要更多的灵活性而不是依赖***密钥和二级密钥是相同的（[0][0], [1][1] 等...）

你可以这样做：（替换上面给出的代码）

//Change the copy of array $data with cents
foreach($data as $top_key=>$second_level) 
    foreach($second_level as $key2=>$value) 
        $level_arr = $na[$top_key][$key2];    
        foreach($level_arr as $key=>$item) 
                $na[$top_key][$key2][$key]['cent'] = (float)$data[$top_key][$key2][$key]['cent'] * 0.087;
        
    

更新3：

我错过了在 update2 中将 $top_key 更改为 $key2（现在我将其更正为），但这里的代码几乎相同，但结果为基于实际数据（来自外部 API）的两位小数成本作为关键而不是美分。我也将实际常数改为 0.877 而不是 0.087。

foreach($data as $top_key=>$second_level) 
    foreach($second_level as $key2=>$level_arr)  
        foreach($level_arr as $key=>$item) 
            $na[$top_key][$key2][$key]['cost'] = 
            number_format(
            (float)$data[$top_key][$key2][$key]['cost'] * 0.877,2
            );
        
    

【讨论】：

这行得通，但是一些键值是整数类型并且它们没有改变，那些是字符串的值改变了。示例：array(3) [0]=> array(1) [7]=> array(18) ["vk"]=> array(2) ["cent"]=> int(10) ["bank"]=> int(0) ["ok"]=> array(2) ["cent"]=> int(8) ["bank"]=> int(0) ["wa "]=> array(2) ["cent"]=> int(18) ["bank"]=> int(88) ["vi"]=> array(2) ["cent"]= > int(12) ["bank"]=> int(4088)

这里不会失败，但你可以强制转换为浮动：$data[$top_key][$top_key][$key]['cent'] * 0.087 TO float()$data[$ top_key][$top_key][$key]['cent'] * 0.087。这样做有用吗？

我试过了，但没有成功。 $na[$top_key][$top_key][$key]['cent'] = number_format(floatval($data[$top_key][$top_key][$key]['cent']) * 0.877, 2);因为我想要两位小数。

告诉我一个确切的值不起作用（哪个键、子键等和值）？ （在之前和之后告诉我），我也许可以为您提供进一步的帮助。

我必须承认我从一开始就设置了错误的常量，这让事情变得更加混乱。