key

Fetch a key from an associative array (PHP 3, PHP 4 )
mixed key ( array array )

key() returns the index element of the current array position.

Example 158. key() example

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<?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);
}
?>

See also current() and next().

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