PYTHON key

is this article helpful?
|
Python replacement for PHP's key [ edit | history ]
In fact, python not support this feature same as php. you can try this

#for python list
a=[1,2,3] 
[i for i,x in enumerate(a) if x == 2]

PHP key

PHP original manual for key [ show | php.net ]

key

(PHP 4, PHP 5)

keyFetch a key from an array

Description

mixed key ( array &$array )

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

Parameters

array

The array.

Return Values

Returns the index.

Examples

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);
}
?>

The above example will output:

fruit1<br />
fruit4<br />
fruit5<br />

See Also

  • current() - Return the current element in an array
  • next() - Advance the internal array pointer of an array