<?php
function test($array)
{
try
{
return is_indexed_array($array);
}
catch (Exception $e)
{
echo $e->getMessage();
return 'error';
}
}
function is_indexed_array( &$array ) {
if ( !is_array($array) || empty($array) ) {
return -1;
}
$next = 0;
foreach ( $array as $k => $v ) {
if ( $k !== $next ) return false;
$next++;
}
return true;
}
////non-arrays
//assert(test(null));
//assert(test(''));
//assert(test(0));
//assert(test(false));
//assert(test(new stdClass));
assert(test([]) === true); // empty array
assert(test([null, 1, 2]) === true); // random test
assert(test(['' => '']) === false); // random test
assert(test([0 => '']) === true); // random test
assert(test([1 => 'a']) === false); // random test
// numeric keys
assert(test(['', 'a', 'b']) === true); // proper indexed array
assert(test([1 => 'a', 2 => 'b', 3 => 'c']) === false); // sequential but not 0-based
assert(test([-1 => '', 0 => '', 1 => 'a']) === false); // sequential but not 0-based
assert(test([0 => '', 2 => 'b', 3 => 'c']) === false); // 1 index missing
assert(test([0 => '', 2 => 'b', 1 => 'a']) === false); // numeric but unordered
// string keys
assert(test(['' => '', 'a' => 'a', 'b' => 'b']) === false); // proper dictionary
// mixed keys
assert(test(['' => '', 1 => 'a', 2 => 'b']) === false); // first key string but rest not; also, associative even though '' == 0
assert(test([0 => '', 1 => 'a', 'b' => 'b']) === false); // first key numeric but rest not
// numeric string keys
assert(test([' 0' => '']) === false); // associative even though ' 0' == 0
assert(test(['00' => '']) === false); // associative even though '00' == 0
assert(test(['0*' => '']) === false); // associative even though '0*' == 0
assert(test(['0.0' => '']) === false); // associative even though '0.0' == 0.0
assert(test(['0x0' => '']) === false); // associative even though '0x0' == 0
assert(test(['0e0' => '']) === false); // associative even though '0e0' == 0
preferences:
42.15 ms | 402 KiB | 5 Q