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Fill an array with values
(PHP 4 >= 4.2.0, PHP 5)
Example 244. array_fill() example<?phpThe above example will output: ArrayCode Examples / Notes » array_fillcaliban
To better handle the problem of sparse array completion mentioned a couple years ago... What you really need in this scenario is an empty array containing all the desired keys, and a sparse array containing the keys and values you want overridden. This PHP5 function does that. (The PEAR package PHP_Compat should be able to fill in the gap -- array_combine() -- for a 4.3 install, if necessary.) <?php function array_complete( $keys="", // array of keys you need filled, in order $sparse="" // sparse array to override blanks ) { if(!is_array($sparse)) $sparse=array(); if(!is_array($keys)) return $sparse; return array_merge( array_combine( // create an associative array $keys, // your list of keys array_fill( // blank value for each key 0,count( $keys ),"" ) ),$sparse // merge with your incomplete array ); } ?> This merges in your sparse array (inserting any additional keys in that array after the ones you've specified), placing its values in the key order you specify, leaving all the other values blank. Test call: var_dump(array_complete(array("test1", "test2", "test3", "test4", "test5"), array("test3" => "test3", "test1" => "test1", "garbage" => "garbage"))); Result: array(6) { ["test1"]=> string(5) "test1" ["test2"]=> string(0) "" ["test3"]=> string(5) "test3" ["test4"]=> string(0) "" ["test5"]=> string(0) "" ["garbage"]=> string(7) "garbage" } csst0266
This is what I recently did to quickly create a two dimensional array (10x10), initialized to 0: <?php $a = array_fill(0, 10, array_fill(0, 10, 0)); ?> This should work for as many dimensions as you want, each time passing to array_fill() (as the 3rd argument) another array_fill() function. jausion
For PHP < 4.2.0 users: Add this to your script: if (!function_exists('array_fill')) { require_once('array_fill.func.php'); } and the array_fill.func.php file: <?php // For PHP version < 4.2.0 missing the array_fill function, // I provide here an alternative. -Philippe function array_fill($iStart, $iLen, $vValue) { $aResult = array(); for ($iCount = $iStart; $iCount < $iLen + $iStart; $iCount++) { $aResult[$iCount] = $vValue; } return $aResult; } ?> 25-aug-2002 09:59
array_fill() cannot be used to setup only missing keys in an array. This may be necessary for example before using implode() on a sparse filled array. The solution is to use this function: <?php function array_setkeys(&$array, $fill = NULL) { $indexmax = -1; for (end($array); $key = key($array); prev($array)) { if ($key > $indexmax) $indexmax = $key; } for ($i = 0; $i <= $indexmax; $i++) { if (!isset($array[$i])) $array[$i] = $fill; } ksort($array); } ?> This is usefull in some situations where you don't know which key index was filled and you want to preserve the association between a positioned field in an imploded array and the key index when exploding it. |
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array_change_key_case array_chunk array_combine array_count_values array_diff_assoc array_diff_key array_diff_uassoc array_diff_ukey array_diff array_fill_keys array_fill array_filter array_flip array_intersect_assoc array_intersect_key array_intersect_uassoc array_intersect_ukey array_intersect array_key_exists array_keys array_map array_merge_recursive array_merge array_multisort array_pad array_pop array_product array_push array_rand array_reduce array_reverse array_search array_shift array_slice array_splice array_sum array_udiff_assoc array_udiff_uassoc array_udiff array_uintersect_assoc array_uintersect_uassoc array_uintersect array_unique array_unshift array_values array_walk_recursive array_walk array arsort asort compact count current each end extract in_array key krsort ksort list natcasesort natsort next pos prev range reset rsort shuffle sizeof sort uasort uksort usort |
