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Return all the values of an array
(PHP 4, PHP 5)
Example 289. array_values() example<?phpThe above example will output: ArrayRelated Examples ( Source code ) » array_values Examples ( Source code ) » array_values Examples ( Source code ) » array_values Code Examples / Notes » array_valueswellandpower
The function here flatterns an entire array and was not the behaviour I expected from a function of this name. I expected the function to flattern every sub array so that all the values were aligned and it would return an array with the same dimensions as the imput array, but as per array_values() adjusting the keys rater than removing them. In order to do this, you will want this function: function array_values_recursive($array) { $temp = array(); foreach ($array as $value) { if(is_array($value)) { $temp[] = array_values_recursive($value); } else { $temp[] = $value; } } return $temp; } Hopefully this will assist. cyberphant0m
That may be true, however I doubt that anyone should have that big of an array. If they do then they probably are doing some intense computing in which case, they may want to opt for the power of C++.
mailseppel
Remember, that the following way of fetching data from a mySql-Table will do exactly the thing as carl described before: An array, which data may be accessed both by numerical and DB-ID-based Indexes: <?php $row = mysql_fetch_array($db_result, $db_link); ?> Hope I haven't misunderstood anything here.. :) deceze
Please note that 'wellandpower at hotmail.com's recursive merge doesn't work. Here's the fixed version: <?php function array_values_recursive($array) { $flat = array(); foreach ($array as $value) { if (is_array($value)) $flat = array_merge($flat, array_values_recursive($value)); else $flat[] = $value; } return $flat; } ?> bluej100
Most of the array_flatten functions don't allow preservation of keys. Mine allows preserve, don't preserve, and preserve only strings (default). <? // recursively reduces deep arrays to single-dimensional arrays // $preserve_keys: (0=>never, 1=>strings, 2=>always) function array_flatten($array, $preserve_keys = 1, &$newArray = Array()) { foreach ($array as $key => $child) { if (is_array($child)) { $newArray =& array_flatten($child, $preserve_keys, $newArray); } elseif ($preserve_keys + is_string($key) > 1) { $newArray[$key] = $child; } else { $newArray[] = $child; } } return $newArray; } // Tests $array = Array( 'A' => Array( 1 => 'foo', 2 => Array( 'a' => 'bar' ) ), 'B' => 'baz' ); echo 'var_dump($array);'."\n"; var_dump($array); echo 'var_dump(array_flatten($array, 0));'."\n"; var_dump(array_flatten($array, 0)); echo 'var_dump(array_flatten($array, 1));'."\n"; var_dump(array_flatten($array, 1)); echo 'var_dump(array_flatten($array, 2));'."\n"; var_dump(array_flatten($array, 2)); ?> nopy
Just a warning that re-indexing an array by array_values() may cause you to reach the memory limit unexpectly. For example, if your PHP momory_limits is 8MB, and says there's a BIG array $bigArray which allocate 5MB of memory. Doing this will cause PHP exceeds the momory limits: <?php $bigArray = array_values( $bigArray ); ?> It's because array_values() does not re-index $bigArray directly, it just re-index it into another array, and assign to itself later. carl
Indeed you can, and that's what's so great about it. I have, for instance, a function that returns the results of a database query as an array. I want to keep the order that the entries were returned in, but at the same time I want to be able to access them _either_ by the position _or_ by some other index (such as some sort of ID in the database, gotten from elsewhere). In this case, I can make the function return an array from id to [array of values], and by a simple call to array_values() this is transformed into an array indexed from 0 to count()-1. Useful.
wizglins
In case you want to replace all keys in multiarrays by integers starting at 0, the following function might help. <?php function numerieren($array) { $array_v = array_values($array); $count_v = count($array_v); for ($i=0; $i<$count_v; $i++) if (is_array($array_v[$i])) $array_v[$i] = numerieren($array_v[$i]); return $array_v; } ?> richard
If you have a numerically indexed array with some keys missing, ie 1, 2, 4, 5 and you want to reindex it so it's 1,2,3,4 *without changing the positions of the values* (ie sort()) then you can use this function to do it.
kars
Also, objects in the array that were added by reference are handled correctly as well: class Foo { var $n; function Foo ($n) { $this->n = $n; } } $a = new Foo(1); $b = new Foo(2); $c = new Foo(3); $l = array(&$a, &$b, &$c); // add by reference $m = array_values($l); $a->n = 5; echo $m[0]->n; This prints "5" as you would expect. 04-nov-2002 03:48
also useful to use for list(), if the array for input is the result of a function that only returns associative arrays: list($var1, $var2, $var3) = array_values(myfunc("only returns assoc arrays")); ahigerd
A comment on array_merge mentioned that array_splice is faster than array_merge for inserting values. This may be the case, but if your goal is instead to reindex a numeric array, array_values() is the function of choice. Performing the following functions in a 100,000-iteration loop gave me the following times: ($b is a 3-element array) array_splice($b, count($b)) => 0.410652 $b = array_splice($b, 0) => 0.272513 array_splice($b, 3) => 0.26529 $b = array_merge($b) => 0.233582 $b = array_values($b) => 0.151298 warmo_at_o2_dot_pl
@Yassin Ezbakhe <yassin88 at gmail dot com> When we have to flatten multidimensional array of strings or numbers this method could be much faster. Inconvenience of this method is, that its speed depends on size of strings/numbers, which array contains - bigger strings, lower efficiency. Conclusion: Use this method for small amount of data in arrays (less than 500B per element in my case) which have many dimensions, in other case, use Yassin Ezbakhe method. <?php function md_implode($array, $glue = '') { if (is_array ($array)) { $output = ''; foreach ($array as $v) { $output .= md_implode($v, $glue); } return $output; } else { return $array.$glue; } } function md_array_flatten($md_array) { $flat_array = explode ('#|#',md_implode($md_array,'#|#')); // "#|#" is a sample delimiter array_pop($flat_array); // to remove last empty element return $flat_array; } //Usage: $flat_array = md_array_flatten($some_md_array) ?> yassin ezbakhe
<?php /********************************************** * * PURPOSE: Flatten a deep multidimensional array into a list of its * scalar values * * array array_values_recursive (array array) * * WARNING: Array keys will be lost * *********************************************/ function array_values_recursive($array) { $arrayValues = array(); foreach ($array as $value) { if (is_scalar($value) OR is_resource($value)) { $arrayValues[] = $value; } elseif (is_array($value)) { $arrayValues = array_merge($arrayValues, array_values_recursive($value)); } } return $arrayValues; } ?> This function is an improved and faster version of the one posted by <27-Apr-2004 09:47> 28-apr-2004 02:47
<?php /** flatten an arbitrarily deep multidimensional array into a list of its scalar values (may be inefficient for large structures) (will infinite recurse on self-referential structures) (could be extended to handle objects) */ function array_values_recursive($ary) { $lst = array(); foreach( array_keys($ary) as $k ){ $v = $ary[$k]; if (is_scalar($v)) { $lst[] = $v; } elseif (is_array($v)) { $lst = array_merge( $lst, array_values_recursive($v) ); } } return $lst; } ?> code till dawn! -mark meves! |
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