A code question about an array inside a loop

Posted by mikedrupalfan on November 24, 2012 at 2:26am

Hi,
I'm a new developer and i have a two question.

1)
that is the code:
Why there is the bold sections?

$instances = field_info_instances('node', 'job_post');
foreach ($instances as $instance_name => $instance) {
field_delete_instance($instance);
}

And not just:

$instances = field_info_instances('node', 'job_post');
foreach ($instances as $instance) {
field_delete_instance($instance);
}

2) Why there is an array_keys

foreach(array_keys(_job_post_installed_fields()) as $fields) {
field_delete_field($field);
}

Comments

Both work, the first gives

Posted by nevets on November 24, 2012 at 3:19am

Both work, the first gives access to both the array index and element. The second loop only gives access to the element.

thanks, but, Why there is an

Posted by mikedrupalfan on November 24, 2012 at 3:52am

thanks,

but,

Why there is an array_keys

foreach(array_keys(_job_post_installed_fields()) as $fields) {
field_delete_field($field);
}

I am guessing

Posted by nevets on November 24, 2012 at 4:09am

I am guessing _job_post_installed_fields() returns an array index by field name, in which case array_keys() would return an array of field names and field_delete_field() expects a field name.