php - Get key of multidimensional array? -

php - Get key of multidimensional array? -

for example, have multidimensional array below:

$array = array ( 0 => array ( 'id' => '9', 'gallery_id' => '2', 'picture' => '56475832.jpg' ), 1 => array ( 'id' => '8', 'gallery_id' => '2', 'picture' => '20083622.jpg' ), 2 => array ( 'id' => '7', 'gallery_id' => '2', 'picture' => '89001465.jpg' ), 3 => array ( 'id' => '6', 'gallery_id' => '2', 'picture' => '47360232.jpg' ), 4 => array ( 'id' => '5', 'gallery_id' => '2', 'picture' => '4876713.jpg' ), 5 => array ( 'id' => '4', 'gallery_id' => '2', 'picture' => '5447392.jpg' ), 6 => array ( 'id' => '3', 'gallery_id' => '2', 'picture' => '95117187.jpg' ) );

how can key of array(0,1,2,3,4,5,6)?

i have tried lot of examples, nil has worked me.

this quite simple, need utilize array_keys():

$keys = array_keys($array);

see working

edit search task, function should job:

function array_search_inner ($array, $attr, $val, $strict = false) { // error input array not array if (!is_array($array)) homecoming false; // loop array foreach ($array $key => $inner) { // error if inner item not array (you may want remove line) if (!is_array($inner)) homecoming false; // skip entries search key not nowadays if (!isset($inner[$attr])) continue; if ($strict) { // strict typing if ($inner[$attr] === $val) homecoming $key; } else { // loose typing if ($inner[$attr] == $val) homecoming $key; } } // didn't find homecoming null; } // illustration usage $key = array_search_inner($array, 'id', 9);

the 4th parameter $strict, if true, utilize strict type comparisons. 9 not work, have pass '9', since values stored strings. returns key of first occurence of match, null if value not found, or false on error. create sure utilize strict comparing on homecoming value, since 0, null , false possible homecoming values , evaluate 0 if using loose integer comparisons.

php arrays