PHP Interpolated Variable as function parameter

Question

Not sure if this is a WordPress issue, but I don't think so.

I have a while loop where I'm iterating over a user-created loop of content and trying to get a meta field, which has a numeric identifier which matches the current "key" (if you can call it that, since this is not an array at all, just a custom loop the user can create with some front-end parameters. $this_label_url is requesting the faux "key" via the interpolation with $this_label_url = get_post_meta($post->ID, 'instructor_{$number}_label_url', true);. Is variable interpolation not possible in this scenario?

<?php
   $total_panels = get_post_meta( $post->ID, 'total_panels', true );  // set by the user with a custom meta value called "total_panels" (an integer)
   $count = 1; // just a fake "key" for looping through my `while`

   // create a faux "number" - simply takes $count and adds leading zero if not present
   while ( $total_panels >= $count ) :

    if ( $count >= 9 ) {
        $number = '0' . $count;
    } else {
        $number = $count;
    } 
$this_label_url = get_post_meta($post->ID, 'instructor_{$number}_label_url', true);  // returns as an empty string,

Change the single quotes ' to double quotes "

air4x
– air4x

2012-10-30 03:13:10 +00:00
Commented Oct 30, 2012 at 3:13 — air4x
– air4x, Commented Oct 30, 2012 at 3:13

G-Nugget · Accepted Answer · 2012-10-30 03:13:48Z

2

It is possible, but you need to use double quotes; single quotes aren't parsed for interpolation.

$this_label_url = get_post_meta($post->ID, "instructor_{$number}_label_url", true);

answered Oct 30, 2012 at 3:13

G-Nugget

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2 Comments

Brian Over a year ago

Thanks - one of those annoying "gotcha's". I guess I'm a terrible person for preferring single quotes, I knew it would catch up with me some day.

doublesharp Over a year ago

@Brian There is a time and place for them, like when you want a literal $ in your string without escaping.

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