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key

Fetch a key from an associative array (PHP 4, PHP 5)
mixed key ( array &array )

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

Example 309. 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);
}
?>


See also current() and next().