开发笔记:迭代数组的问题

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对于第二次迭代，$alreadyscanned将设置在与该条件不匹配的用户上（如果已扫描的用户已经在其之前）。重置$alreadyscanned的值或使用数组来保留错误列表。

$alreadyscanned = [];
foreach ($json_data as $data){
$barcodejson = $data['Barcode'];
if($barcodejson == $barcode){
$alreadyscanned[$barcodejson] = 'This user is already in your contacts';
} else { do something}
}
foreach($alreadyscanned as $barcode => $error) {
var_dump($barcode. " :: " . $error);
}


当你进入break部分时，考虑在循环中使用if：一旦找到重复内容，你不想继续：

if($barcodejson == $barcode){
$alreadyscanned = 'This user is already in your contacts';
break;
} else { do something}


现在dosomething在这里可能是不受欢迎的（取决于它的作用）。您可能需要在单独的循环中执行此操作。像这样的东西：

$alreadyscanned= "";
foreach ($json_data as $data){
$barcodejson = $data['Barcode'];
if($barcodejson == $barcode){
$alreadyscanned = 'This user is already in your contacts';
break;
}
}
if ($alreadyscanned=="") {
foreach ($json_data as $data){
$barcodejson = $data['Barcode'];
// do something
}
}


缺少分号和东西会使得更难获得理想的结果。

这样的事情可能会帮助您获得所需的数据。基本上你可以通过print_r-json解码过程来检查解析的结果。

然后，您将获得每个条目的处理结果，并且再次作为测试，您可以打印生成的数组。

php
//Enter your code here, enjoy!
$json = '[
{
"FirstName": "lee",
"LastName": "skelding",
"Email": "mail.mail.com",
"Barcode": "732580652913857773001",
"Phone": "00000000",
"Company": "SKELLATECH V3",
"Position": "CEO"
},
{
"FirstName": "Kenneth",
"LastName": "Brandon",
"Email": "mail.mail.com",
"Barcode": "732559813913833509001",
"Phone": null,
"Company": null,
"Position": null
},
{
"FirstName": "lee",
"LastName": "skelding",
"Email": "mail.mail.com",
"Barcode": "732580652913857773001",
"Phone": "0000000000",
"Company": "SKELLATECH V3",
"Position": "CEO"
}]'
;
$barcode = '732580652913857773001'; //just an example this is set as a variable
$json_data = json_decode($json, true);
print_r($json_data);
foreach ($json_data as $data){
$barcodejson = $data['Barcode'];
if($barcodejson == $barcode){
$alreadyscanned[] = 'user ' . $data["Email"] .' is already in your contacts';
} else {
$alreadyscanned[] = 'This user '. $data["Email"] .' is not in your contacts';
}
}
print_r($alreadyscanned);


您需要使用一个函数，以便在找到所需的条形码时使用return

function searchbarcode($json_data, $barcode)
{
foreach($json_data as $data)
{
if ( $data['Barcode'] == $barcode )
return true;
}
return false;
}
$barcode = '0000000' //just an example this is set as a variable
$json_data = json_decode($json,true);
if(searchbarcode($json_data, $barcode)){
$alreadyscanned = 'This user is already in your contacts';
} else { do something}