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@ 2013-02-01T13:28:59Z

<?php
$array = array();
echo PHP_EOL . ' on empty array: ' . PHP_EOL;
var_dump(key($array));

$array[] = 'f';
echo PHP_EOL . ' size one array: ' . PHP_EOL;
var_dump(key($array));

$array[] = 'f';
echo PHP_EOL . ' size two array: ' . PHP_EOL;
var_dump(key($array));

echo PHP_EOL . ' within loop: ' . PHP_EOL;
foreach ($array as $key => $value) {
    var_dump(key($array));
    if ($key == 0) {
        echo PHP_EOL . ' unsetting first element.... ' . PHP_EOL;
        unset($array[$key]);
    }

    if ($key == 1) {
        echo PHP_EOL . ' unsetting second element.... ' . PHP_EOL;
        unset($array[$key]);
    }
}

echo PHP_EOL . ' after loop: ' . PHP_EOL;
var_dump(key($array));

reset($array);
echo PHP_EOL . ' after reset: ' . PHP_EOL;
var_dump(key($array));

end($array);
echo PHP_EOL . ' after end: ' . PHP_EOL;
var_dump(key($array));

echo PHP_EOL . ' trying to trigger "Undefined index:  " error: with NULL key' . PHP_EOL;
$array[null];

echo PHP_EOL . ' trying to trigger "Undefined index:  " error: with empty string key' . PHP_EOL;
$array[''];

Output for git.master, git.master_jit, rfc.property-hooks: on empty array: NULL size one array: int(0) size two array: int(0) within loop: int(0) unsetting first element.... int(1) unsetting second element.... after loop: NULL after reset: NULL after end: NULL trying to trigger "Undefined index: " error: with NULL key Warning: Undefined array key "" in /in/btrIb on line 40 trying to trigger "Undefined index: " error: with empty string key Warning: Undefined array key "" in /in/btrIb on line 43

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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