PHP explode - running loop through each array item

问题

Here's the issue:

I retrieve the following data string from my database:

$row->exceptions = '1,2,3';

After explode I need the below code to check each one of the exploded pieces

$exceptions = explode(",", $row->exceptions);

//result is 
//[0] => 1
//[1] => 2
//[2] => 3

for ($i = 0; $i <= $row->frequency; $i++) {

    if ($exceptions[] == $i) {

        continue;

    } else {

        //do something else
    }
}

How can I make $exceptions[] loop through all keys from the exploded array so it evaluates if ==$i?

Thanks for helping.

回答1:

It should suffice to substitute:

if($exceptions[] == $i)

with:

if(in_array($i,$exceptions))

By the way, it eliminates the need for a nested loop.

回答2:

Ah, should be straightforward, no?

$exceptions = explode(",", $row->exceptions);
for ($i = 0; $i <= $row->frequency; $i++) {

    foreach($exceptions as $j){
    if($j == $i){
        // do something
        break;
    }
}
}

回答3:

I think I understand what you are asking. Here's how you would test within that loop whether the key equals $i.

for ($i = 0; $i <= $row->frequency; $i++)
{
  foreach ($exceptions as $key => $value)
  {
    if ($key == $i)
    {
      continue;
    }
  }
}

来源：https://stackoverflow.com/questions/5925800/php-explode-running-loop-through-each-array-item