array_keys() function returns an array containing all keys : array_keys « Data Structure « PHP






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  3. array_keys

array_keys() function returns an array containing all keys

 
//If the search_element is included, then only the keys matching that particular element are returned; otherwise, all keys constituting the array are returned. 

//Its syntax is: array array_keys (array array, mixed [search_element])

//use array_keys() to return the key of a given element:
<?
$wines = array ("A" => "a","Q" => "q","E" => "e");
$labels = array_keys($wines);
print $labels;
print '<BR>';
$labels = array_keys($wines, "a");
print_r $labels;
?>








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