Pass variable to array index

Question

Here's what I have

foreach ( $post_formats as $format ) {
    if ( $options['show_post_formats'][$format] == 0 ) {
        $format = 'post-format-' . $format;
        array_push( $hide, $format );
    }
}

and it works fine ... but gives me an Undefined index: error when I debug because it wants the value of $format to be in quotes. How would I do this properly?

ok but it's the $format is what the debugger has a problem with because it's expecting the value to be in quotes — byronyasgur
– byronyasgur, Commented Feb 12, 2013 at 0:07
As @MathieuImbert stated, more source would be of great use, but you can check if an index exists with isset — fiz
– fiz, Commented Feb 12, 2013 at 0:08
@byronyasgur A specific $format doesn't exist in your array, you should go with Lawrence's answer. — Tchoupi
– Tchoupi, Commented Feb 12, 2013 at 0:09
think I might have had the wrong idea about what the problem was — byronyasgur
– byronyasgur, Commented Feb 12, 2013 at 0:17

Lawrence Cherone · Accepted Answer · 2013-02-12 00:21:16Z

3

as your not sure the index will be there you simply use !empty() and check the array key exists.

<?php 
foreach ( $post_formats as $format ) {
    if (!empty($format) && array_key_exists($format, $options['show_post_formats']) && $options['show_post_formats'][$format] == 0 ) {
        $format = 'post-format-' . $format;
        array_push( $hide, $format );
    }
}
?>

edited Feb 12, 2013 at 0:21

answered Feb 12, 2013 at 0:07

Lawrence Cherone

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2 Comments

byronyasgur Over a year ago

not sure I understand ... do I drop the entire foreach into this?

Lawrence Cherone Over a year ago

There was no foreach when I answered, anyways $format could possible be an empty value or blank thus causing the problem. Updated

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