Question

我正在使用循环进行一些数组操作。

我想将数组键值与给定名称进行比较。

但我无法得到确切的输出。

这是我的阵列：

Array
(
    [0] => Array
        (
            [label] =>  
            [value] => 
        )

    [1] => Array
        (
            [label] => 3M
            [value] => 76
        )

    [2] => Array
        (
            [label] => Test
            [value] => 4
        )

    [3] => Array
        (
            [label] => Test1
            [value] => 5
        )

    [4] => Array
        (
            [label] => Test2
            [value] => 6
        )
)

这是我的变化，我需要比较：$test_name = "Test2";

以下代码我尝试过：

 $details // getting array in this varriable
if($details['label'] == $test_name)
{
    return $test_name;
}
else
{
    return "NotFound";
}

但每次它返回NotFound。

没有得到确切的问题。

Answer 1

@Manthan Dave尝试使用array_column和in_array（），如下所示：

<?php
if(in_array($test_name, array_column($details, "label"))){
    return $test_name;
}
else
{
    return "NotFound";
}

Answer 2

$details是一个多维数组，但你试图像一个简单的数组一样访问它你需要循环它：

foreach ($details as $item) {
    if($item['label'] == $test_name)
    {
        return $test_name;
    }
    else
    {
        return "NotFound";
    }
}

我希望你的数组永远不能包含标签NotFound ...：）

Answer 3

你在数组里面使用下面的数组，

if($details[4]['label'] == $test_name)
{
    return $test_name;
}
else
{
    return "NotFound";
}

虽然foreach循环应该可行，但如果没有尝试，

for($i=0; $i<count($details); $i++){

    if($details[$i]['label'] == $test_name)
    {
        return $test_name;
    }
    else
    {
        return "NotFound";
    }

}

Answer 4

只使用in_array和array_column而不使用foreach循环

if (in_array($test_name,array_column($details, 'label')))
{
    return $test_name;
}
else
{
    return "NotFound";
}

Answer 5

你只需要检查下面的if条件，因为第一次遇到它会返回“notfound”，然后就不会执行。

$result = 'NotFound';
if (in_array($test_name,array_column($details, 'label')))
{
    $result = $test_name;
}
return $result;

或

public class Main_Page extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {

FirebaseAuth mFirebaseAuth;
FirebaseAuth.AuthStateListener mAuthStateListener;
GoogleApiClient mGoogleApiClient;

//Recycler view
private RecyclerView mTodoList;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main__page);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    //Firebase Auth
    mFirebaseAuth = FirebaseAuth.getInstance();
    mAuthStateListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            if (firebaseAuth.getCurrentUser() == null) {
                finish();
                startActivity(new Intent(Main_Page.this, SignIn.class));

            }
        }
    };

    FloatingActionButton fab = (FloatingActionButton) 
findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            finish();
            startActivity(new Intent(Main_Page.this, Add_To_Do.class));
        }
    });

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, 
R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) 
findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);


    //Recycler View
    mTodoList = (RecyclerView) findViewById(R.id.todo_list);
    mTodoList.setHasFixedSize(true);
    mTodoList.setLayoutManager(new LinearLayoutManager(this));

}







@Override
protected void onStart() {
    super.onStart();
    mFirebaseAuth.addAuthStateListener(mAuthStateListener);

    /*If i write FirebaseRecyclerAdapter it is not showing any suggestions
and if i write it manually i am getting an redline and it tells me to make a 
class or a function*/
    FirebaseRecy

}

//Recycler View
public  static class ToDoViewHolder extends RecyclerView.ViewHolder{

    View mView;

    public ToDoViewHolder(View itemView) {
        super(itemView);

        mView = itemView;
    }

    public void setLabel(String label){
        TextView post_label = (TextView) 
mView.findViewById(R.id.post_label);
        post_label.setText(label);
    }

    public  void setNote(String note){
        TextView post_note = (TextView) mView.findViewById(R.id.post_note);
        post_note.setText(note);
    }


}

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main__page, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        mFirebaseAuth.signOut();
    }

    return super.onOptionsItemSelected(item);
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();

    if (id == R.id.nav_camera) {
        // Handle the camera action
    } else if (id == R.id.nav_gallery) {

    } else if (id == R.id.nav_slideshow) {

    } else if (id == R.id.nav_manage) {

    } else if (id == R.id.nav_share) {

    } else if (id == R.id.nav_send) {

    }

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}
}

Answer 6

像这样遍历你的数组，

array_walk($array, function($v) use($test_name){echo $v['label'] == $test_name ? $test_name : "NotFound";});

将Array键值与给定名称进行比较

6 个答案: