从数组中为每个循环构建简单的PHP

问题描述：

I have an array called $user_ids that prints as:

Array ( [0] => stdClass Object ( [user_id] => 1 ) [1] => stdClass Object ( [user_id] => 2 ) )

I want to perform send_msg for every user_id in the array. In the example above, I want to achieve the equivalent of this:

send_msg( 1, $body_input, $subject_input);  
send_msg( 2, $body_input, $subject_input);

This is what I have tried but it doesn't work.

foreach ($user_ids as $user_N){
send_msg( $user_N, $body_input, $subject_input);    
}

我有一个名为$ user_ids code>的数组，打印为： p>

 数组（[0] =＆gt; stdClass对象（[user_id] =＆gt; 1）[1] =＆gt; stdClass对象（[user_id] =＆gt; 2））
  code  >  pre> 
 
 我想为数组中的每个 user_id  code>执行 send_msg  code>。 在上面的例子中，我想实现相当于： p> 
 
 
  send_msg（1，$ body_input，$ subject_input）;  
send_msg（2，$ body_input，$ subject_input）;  
  code>  pre> 
 
 这是我尝试过但它不起作用。 p> 
 
 
  foreach（$ user_ids as $  user_N）{
send_msg（$ user_N，$ body_input，$ subject_input）;  
} 
  code>  pre> 
  div>

答

In PHP >= 7.0.0 you can extract all of the user_ids from the objects with array_column:

foreach(array_column($user_ids, 'user_id') as $user_N) {
    send_msg($user_N, $body_input, $subject_input);    
}

答

<?php
// You're looping over objects; not user IDs
foreach ($user_ids as $obj){
    send_msg( $obj->user_id, $body_input, $subject_input);    
}
?>

答

You have an array with objects. To get the ID in your loop, you must use $user_N->user_id so change your loop to:

foreach ($user_ids as $user_N){
    send_msg( $user_N->user_id, $body_input, $subject_input);    
}

答

looks like you converted a JSON to ARRAY without passing second parameter to true and that is why you have array of objects.

http://php.net/manual/en/function.json-decode.php

In this case you can do

send_msg( $user_N->user_id, $body_input, $subject_input);

But if you convert JSON to associated array(by passing second param to true), then you can do

send_msg( $user_N['user_id'], $body_input, $subject_input);

从数组中为每个循环构建简单的PHP

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