key
(PHP 3, PHP 4 , PHP 5)
key -- Fetch a key from an associative array
Description
mixed
key ( array &array)
key() returns the index element of the
current array position.
Example 1. key() example
<?php
$array = array(
'fruit1' => 'apple',
'fruit2' => 'orange',
'fruit3' => 'grape',
'fruit4' => 'apple',
'fruit5' => 'apple');
// this cycle echoes all associative array
// key where value equals "apple"
while ($fruit_name = current($array)) {
if ($fruit_name == 'apple') {
echo key($array).'<br />';
}
next($array);
}
?>
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See also current() and next().