從循環中生成的字符串中刪除最后一個字符

Question

相信我，我已經嘗試了堆棧溢出中的所有內容！

所以，我得到了這個JSON -

$j={
    "itempicture": [
        {
            "status": "3"
        },
        {
            "ItemCode": "001",
            "ItemImage": "image1",
            "ItemCategory": "shirt",
            "ShowOnPOS": "Yes",
            "LastModifiedOn": "2018-06-02 11:53:57"
        },
        {
            "ItemCode": "002",
            "ItemImage": "image2",
            "ItemCategory": "shirt",
            "ShowOnPOS": "Yes",
            "LastModifiedOn": "2018-06-02 11:53:57"
        }
    ]
}

我正在這樣訪問它 -

$jo = json_decode($j);
for($i = 1; $i < count($jo->itempicture); $i++) {
    foreach($jo->itempicture[$i] as $prop=>$val) {
        echo $val.",";
    }
    echo '<br>';
}

我得到了這個輸出 -

001,image1,shirt,Yes,2018-06-02 11:53:57,
002,image2,shirt,Yes,2018-06-02 11:53:57,

這個輸出的主要問題是最后的“，”。 我無法刪除它！

嘗試了一切 - 這 - 從字符串中刪除最后一個字符

與substr，rtrim，implode ......一切！

它不起作用！

Answer 1

使用implode()版本意味着您必須從JSON轉換為數組（默認是轉換為對象，因此將true添加為json_decode()第二個參數）。

$j='{"itempicture":[
{
    "status":"3"
},
{
    "ItemCode":"001",
    "ItemImage":"image1",
    "ItemCategory":"shirt",
    "ShowOnPOS":"Yes",
    "LastModifiedOn":"2018-06-02 11:53:57"
},
{
    "ItemCode":"002",
    "ItemImage":"image2",
    "ItemCategory":"shirt",
    "ShowOnPOS":"Yes",
    "LastModifiedOn":"2018-06-02 11:53:57"
}
]
}';
$jo=json_decode($j, true);
array_shift($jo['itempicture']);
$edata = '';
foreach ( $jo['itempicture'] as $item)  {
    $edata .= implode(",", $item).'<br/>';
}
echo "<pre>";
print_r($edata);
echo "</pre>";

打印出......

<pre>001,image1,shirt,Yes,2018-06-02 11:53:57<br/>
002,image2,shirt,Yes,2018-06-02 11:53:57<br/></pre>

Answer 2

這是解決方案

$j='{"itempicture":[
{
    "status":"3"
},
{
    "ItemCode":"001",
    "ItemImage":"image1",
    "ItemCategory":"shirt",
    "ShowOnPOS":"Yes",
    "LastModifiedOn":"2018-06-02 11:53:57"
},
{
    "ItemCode":"002",
    "ItemImage":"image2",
    "ItemCategory":"shirt",
    "ShowOnPOS":"Yes",
    "LastModifiedOn":"2018-06-02 11:53:57"
}
]
}';
$jo=json_decode($j);
$edata = '';
for($i=1;$i<count($jo->itempicture);$i++){
    $data = '';
    foreach($jo->itempicture[$i] as $prop=>$val){
        $data .= $val.",";
    }
    $edata .= rtrim($data, ",");
    $edata .='<br/>';
}

echo "<pre>";
print_r($edata);
echo "</pre>";

Answer 3

你可以這樣做

 $jo=json_decode($j);

 for($i=1;$i<count($jo->itempicture);$i++){
 foreach($jo->itempicture[$i] as $prop=>$val){
      if ($value === end($jo->itempicture[$i])) {
        echo $val;
      }
      else {
        echo $val.",";
      }
 }
 echo '<br>';
}

通過比較當前迭代是否是循環的結束，這將阻止寫入最后一個'，'

Answer 4

如果你知道最后一個元素總是LastModifiedOn

$jo=json_decode($j);
 for($i=1;$i<count($jo->itempicture);$i++){
 foreach($jo->itempicture[$i] as $prop=>$val){
    if($prop == "LastModifiedOn")
        echo $val;
    else
        echo $val.",";
 }
 echo '<br>';
}