Help debugging php code

I'm hacking into a wordpress plugin. Since I'm inside a plugin that posts tweets, I use something like echo or print. I've identified one line that causes the problem, but not sure what exactly it is, since I can't print or echo.

$tagarray = wp_get_post_tags( $post_id); //returns an array
$tags = "tag:";
if (count($tagarray) > 0){
    foreach ( $tagarray as $tag ){
        //$tags .= "mytag ";  // This line  works when quo开发者_运维问答tes are removed.
        //$tags = strval($tag);  //This doesn't.
    }
}

I've tried various manipulations of $tag, like casting etc, but nothing works. Any ideas on how to debug? My last resort would be to publish print values to a file. Any other ideas?

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Your code is incomplete.

Yes, wp_get_post_tags() returns a list of tags, but each tag in that list is itself an object containing the following:

• term_id
• name
• slug
• term_group
• term_taxonomy_id
• taxonomy
• description
• parent
• count

So you need to do this instead:

$tagarray = wp_get_post_tags( $post_id ); //returns an array
$tags = "tag:";
if (count($tagarray) > 0){
    foreach ( $tagarray as $tag ){
        $tags .= strval( $tag->name );
    }
}

---

In you're loop use :

var_dump($tag);
die();

You should be able to see exactly what type of is $tag and what content . the loop will stop imediatly after the first value .

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I find FirePHP (addon for FireBug/Firefox) very useful for debugging php, you can send messages, arrays, variables to the firebug console before headers are sent.

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for debugging php I use PhpED you can set breakpoints in the code without any modifications, so there is no chance that you'll leave some echos in the code.

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for debugging use var_dump or print_r

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that doesn't work because you missed to concatation operator (.) in the second line

$tagarray = wp_get_post_tags( $post_id); //returns an array
$tags = "tag:";
if (count($tagarray) > 0){
    foreach ( $tagarray as $tag ){
        //$tags .= "mytag ";  // This line  works when quotes are removed.
        $tags .= strval($tag);  //This will work Changed = to .=
    }
}

And if are looking for debugging the code FirePHP is a good tool, also you could use any PHP IDE with builtin debugging like eclipse or something.

And in wordpress you can use WP-Debug Plugin

---

To debug, since it won't output any sort of debugging info to the browser, do this, or something similar:

$logger = fopen('debug.log','a');
fwrite($logger,"Begin Debug - " . time() . "\n------------\n");
$tagarray = wp_get_post_tags( $post_id); //returns an array
$tags = "tag:";
if (count($tagarray) > 0){
    foreach ( $tagarray as $tag ){
        //$tags .= "mytag ";  // This line  works when quotes are removed.
        //$tags = strval($tag);  //This doesn't.
        fwrite($logger,$tag . "\n");
    }
}
fwrite($logger,$tags . "\n");
fwrite($logger,print_r($tagarray) . "\n");
fwrite($logger,"----------\n End Debug \n\n");
fclose($logger);