в 10:37, 26 мая 2010

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2010-05-26T07:02:51Z

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==array_keys() function returns an array containing all keys==



<source lang="html4strict">

//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 " ";
$labels = array_keys($wines, "a");
print_r $labels;
?>

</source>

==array_keys( ) returns an array of all the keys in that array==



<source lang="html4strict">

array array_keys ( array arr [, mixed search [, bool strict]] )
<?
$users[923] = "T";
$users[100] = "S";
$users[1202] = "C";
$userids = array_keys($users);

$users[923] = "T";
$users[100] = "S";
$users[1202] = "C";
$userids = array_keys($users, "T");
?>

</source>

==Outputting Using array_values() and array_keys() for Backward Compatibility==



<source lang="html4strict">

<?
$countries_languages = array("Germany" => "German", "France" => "French", "Spain" => "Spanish");

printf("Languages: %s.\n",
implode(", ", array_values($countries_languages)) );

printf("Countries: %s.\n",
implode(", ", array_keys($countries_languages)) );

?>

</source>

==Return all the keys of an array with array array_keys (array input [, mixed search_value])==



<source lang="html4strict">

<?
$array = array(0 => 100, "color" => "red");
array_keys ($array);
$array = array(1, 100, 2, 100);
array_keys ($array, 100);
?>

</source>

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