Does anyoone know if its possible to check a custom field value for a character such as a currency symbol and then remove it from the field value so that the field contains a numerical value, not an alphanumercial / text value ?

If so, what would be the best approach for this ?

The field auto updates so it would need to be some kind of regular conditional test and modification - is there a way to attach the test to trigger when the field updated ?

Maybe this would require some kind of field mapping ?

  • Just thought about it and something like this, mapping the value into a new field would do it I think; <?php global $post; $pricewithsymbol = get_post_meta( $post->ID, 'THEORIGINALFIELD', true ); if (strpos($pricewithsymbol, '$') !== false) { $pricewithoutsymbol = preg_replace("$", "", $pricewithsymbol); } update_post_meta($post_id, 'THENEWFIELD', $pricewithoutsymbol); ?> – Nic Windley Jul 23 '13 at 16:14
  • How would I que this so that it only ran when viewing or editing post pages ? – Nic Windley Jul 23 '13 at 16:29
  • This is more a PHP/JavaScript question than a WordPress one. – Wyck Jul 23 '13 at 16:52
  • @Wyck, that actually depends on where he is using this. Where are you using this? You trying to filter this out of the edit page? Or on display? – GhostToast Jul 23 '13 at 17:09

You might try this:

$str = 'This is a very large number 999,999,999.999 !';
echo $str = preg_replace( '/[^\d,.]/', '', $str );

to only allow:

  • digits (0-9)
  • commas (,)
  • dots (.)

You might then consider filters like:


where $meta_type is the type of object metadata (comment, post or user).

ps: just remember to take backup before testing these filters ;-)

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