Get Array Values Recursively with PHP
I've been helping to write a WordPress plugin (I'm not ready to share it yet) and one of the tasks required is validating an array of user-selected values against a list of known valid values. The known valid array is actually a key=>value array so unfortunately array_values wont help get the simple list I'd like.
Instead a more advanced custom function was needed:
// http://php.net/manual/en/function.array-values.php
function array_values_recursive($array) {
$flat = array();
foreach($array as $value) {
if (is_array($value)) {
$flat = array_merge($flat, array_values_recursive($value));
}
else {
$flat[] = $value;
}
}
return $flat;
}
This recursive function dives into arrays, even key=>value arrays, to retrieve the final list of values. Thank you PHP.net!
![An Interview with Eric Meyer]()
Your early CSS books were instrumental in pushing my love for front end technologies. What was it about CSS that you fell in love with and drove you to write about it?
At first blush, it was the simplicity of it as compared to the table-and-spacer...
![Camera and Video Control with HTML5]()
Client-side APIs on mobile and desktop devices are quickly providing the same APIs. Of course our mobile devices got access to some of these APIs first, but those APIs are slowly making their way to the desktop. One of those APIs is the getUserMedia API...
![Basic AJAX Requests Using MooTools 1.2]()
AJAX has become a huge part of the modern web and that wont change in the foreseeable future. MooTools has made AJAX so simple that a rookie developer can get their dynamic pages working in no time.
Step 1: The XHTML
Here we define two links...
![Build a Calendar Using PHP, XHTML, and CSS]()
One of the website features my customers love to provider their web users is an online dynamic calendar. An online calendar can be used for events, upcoming product specials, memos, and anything else you can think of. I've taken some time to completely...
No need to create a new array, just use iterators. There is an interface for iterators with values that can be iterators called RecursiveIterator. To wrap a nested array there is RecursiveArrayIterator. And to flatten an RecursiveIterator you can use RecursiveIteratorIterator, which by default only returns the leaves.
$it = new RecursiveIteratorIterator(new RecursiveArrayIterator($array)); foreach ($it as $k => $v) { var_dump("$k = $v"); }If you want to convert it to an array use iterator_to_array():
Although if you’re going to call
iterator_to_array()I think you’ve defeated your stated purpose for using iterators.I just love this blog, I always get to know something new. I didn’t know about this. Very useful!
function flatten_array($arg) { return is_array($arg) ? array_reduce($arg, function ($c, $a) { return array_merge($c, flatten_array($a)); },[]) : [$arg]; }