PHP in_array for $_POST

Question

I hope this isn't too vague a question, but here goes.

I want to loop through the values stored in the textfield_array and see if they match any keys in the $_POST array. If they do I want to assign them to the an_arrayarray.

It seems that there are no matches, although I know that there should be! Here's my code:

<?php
$an_array = array();

$textfield_array = array(
 'item_no', 'button_text', 'text_field', 'drop_down_title'
);

foreach( $textfield_array as $textfield ){
  if( in_array( $textfield, $_POST ) ){
    $an_array[$textfield] = $_POST[$textfield];
  }
}
?>

Am I being daft? Or misunderstanding how the $_POSTarray works?!

$_POST is an array like others.

Dmitry Teplyakov
– Dmitry Teplyakov

2011-11-12 21:16:32 +00:00
Commented Nov 12, 2011 at 21:16 — Dmitry Teplyakov
– Dmitry Teplyakov, Commented Nov 12, 2011 at 21:16

JJJ · Accepted Answer · 2011-11-12 21:16:22Z

6

You are misunderstanding how in_array works. in_array checks the values. You want to check the keys.

You can either use isset, or you can use array_key_exists (returns true if item exists with a value of null).

foreach ($textfield_array as $textfield) {
    if (isset($_POST[$textfield])) {
        $an_array[$textfield] = $_POST[$textfield];
    }
}

edited Nov 12, 2011 at 21:16

JJJ

33.2k20 gold badges95 silver badges103 bronze badges

answered Nov 12, 2011 at 21:14

igorw

28.4k6 gold badges82 silver badges92 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Richard Sweeney Over a year ago

Cheers for that. I did indeed misunderstand how in_array works! Thanks for setting me straight! R

Jim H. · Accepted Answer · 2011-11-12 21:14:43Z

1

Use the array_intersect function.

$an_array = array_intersect(array_keys($_POST), $textfield_array);

answered Nov 12, 2011 at 21:14

Jim H.

5,5591 gold badge26 silver badges23 bronze badges

1 Comment

Casey Chu Over a year ago

This creates an array of keys, not an associative array as the OP originally asked for. Try array_intersect_key($_POST, array_flip($textfield_array))

Collectives™ on Stack Overflow

PHP in_array for $_POST

2 Answers 2

1 Comment

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related