Invalid argument supplied for foreach()

rtcary

I have an array, MyArray, that may or may not have values in it after running a process. If there are no values in it, I get the "Invalid argument..." error when I try

foreach (MyArray] as $key => $value) {
echo $key . ": " . $value . "<br>";
}

If it has one or more items in it, all works fine. What is the best way to test to see if the code containing the "foreach" should be run?

Many thanks...

Todd

dagon

if (!empty($MyArray)){
...

rtcary

Darn! I still get the same error. When I do an echo $MyArray, "Array" is returned, so it is a proper variable type. It is a variable that is obtained from a <form> using POST. Would that do something to MyArray?

isset() returns TRUE and count() returns 1.

Todd

rtcary

This takes care of the problem, but it seems messy:

  if ($rvars[attend] != "Array") {
    foreach ($rvars[attend] as $key => $value) {
      $att->update_attend($key, $rvars[event_ref]);
    }
  }

The returned variables are in the array, $rvars.

Suggestions welcomed....

Todd

dagon

if its not an array you can't use foreach

rtcary

Understood about not being able to use an foreach() if the variable is not an array, however if it is return as a POST, it is an array, but is not accepted in the foreach(). If it is "empty", that is, none of the records were checked, echo MyArray, outputs "Array". Very strange, indeed.

Todd

effim

rtcary;10912008 wrote:
I have an array, MyArray, that may or may not have values in it after running a process. If there are no values in it, I get the "Invalid argument..." error when I try

foreach (MyArray] as $key => $value) {
echo $key . ": " . $value . "<br>";
}

If it has one or more items in it, all works fine. What is the best way to test to see if the code containing the "foreach" should be run?

Many thanks...

Todd

If that's the actual code you're using, you've got all sorts of problems. The following is a good template for you to revise against.

foreach ($array as $key => $value) {
    echo "$key: $value<br>";
}

And for the record, as long as the variable given to a foreach loop is an array you shouldn't have any issues. That is, the array does not have to have any elements, so long as it is actually an array.

Weedpacket

rtcary wrote:
If it is "empty", that is, none of the records were checked, echo MyArray, outputs "Array". Very strange, indeed.

Of course, when echoed, the string "Array" outputs "Array" as well .....

Use [man]var_dump[/man] to investigate exactly what is in the variable; [man]gettype[/man] to just see what type it is; [man]is_array[/man] to see if it is an array.

It is a variable that is obtained from a <form> using POST. Would that do something to MyArray?

It could, depending on the field names: each individual field of a submitted form is a string (that's all they contain, and that's all they are when they're submitted), and it's the name of the field that tells PHP if some of those strings are to be grouped together as an array when they're received.