Online PHP editor | output for V3bcV

<?php

function test($array)
{
	try 
	{
		return is_associative_array($array);
	}
	catch (Exception $e)
	{
		echo $e->getMessage();
		return 'error';
	}
}

function is_associative_array($array)
{
    // your fav method here
}

//// non-array - adjust according to your preferred error handling technique
//assert(test(null));
//assert(test(''));
//assert(test(0));
//assert(test(false));
//assert(test(new stdClass));

// empty array
assert(test([]) === true);

// numeric keys
assert(test([null, 'a', 'b']) === false); // proper indexed array; also, to catch wrong isset usage
assert(test([1 => 'a', 2 => 'b', 3 => 'c']) === true); // sequential but not 0-based
assert(test([-1 => '', 0 => '', 1 => 'a']) === true); // sequential but not 0-based
assert(test([0 => '', 2 => 'b', 3 => 'c']) === true); // 1 index missing
assert(test([0 => '', 2 => 'b', 1 => 'a']) === true); // numeric but unordered
assert(test([0 => '']) === false); // single item
assert(test([1 => 'a']) === true); // single item
assert(test([NAN]) === false);
assert(test([NAN => '']) === true); 
assert(test([INF]) === false);
assert(test([INF => '']) === true);

// string keys
assert(test(['' => '', 'a' => 'a', 'b' => 'b']) === true); // proper associative array
assert(test(['' => '']) === true);  // single item; also, associative even though '' == 0

// mixed keys
assert(test(['' => '', 1 => 'a']) === true); // first key string but rest not
assert(test(['' => '', 0 => '']) === true); // first key string but rest not
assert(test([0 => '', 'a' => 'a']) === true); // first key numeric but rest not

// numeric string keys
assert(test([' 0' => '']) === true); // associative even though ' 0' == 0
assert(test(['00' => '']) === true); // associative even though '00' == 0
assert(test(['0*' => '']) === true); // associative even though '0*' == 0
assert(test(['0.0' => '']) === true); // associative even though '0.0' == 0.0
assert(test(['0x0' => '']) === true); // associative even though '0x0' == 0
assert(test(['0e0' => '']) === true); // associative even though '0e0' == 0

eol versions

based on rRiAb

Output for 7.0.0 - 7.2.0: Warning: assert(): assert(test([]) === true) failed in /in/V3bcV on line 29 Warning: assert(): assert(test([null, 'a', 'b']) === false) failed in /in/V3bcV on line 32 Warning: assert(): assert(test([1 => 'a', 2 => 'b', 3 => 'c']) === true) failed in /in/V3bcV on line 33 Warning: assert(): assert(test([-1 => '', 0 => '', 1 => 'a']) === true) failed in /in/V3bcV on line 34 Warning: assert(): assert(test([0 => '', 2 => 'b', 3 => 'c']) === true) failed in /in/V3bcV on line 35 Warning: assert(): assert(test([0 => '', 2 => 'b', 1 => 'a']) === true) failed in /in/V3bcV on line 36 Warning: assert(): assert(test([0 => '']) === false) failed in /in/V3bcV on line 37 Warning: assert(): assert(test([1 => 'a']) === true) failed in /in/V3bcV on line 38 Warning: assert(): assert(test([NAN]) === false) failed in /in/V3bcV on line 39 Warning: assert(): assert(test([NAN => '']) === true) failed in /in/V3bcV on line 40 Warning: assert(): assert(test([INF]) === false) failed in /in/V3bcV on line 41 Warning: assert(): assert(test([INF => '']) === true) failed in /in/V3bcV on line 42 Warning: assert(): assert(test(['' => '', 'a' => 'a', 'b' => 'b']) === true) failed in /in/V3bcV on line 45 Warning: assert(): assert(test(['' => '']) === true) failed in /in/V3bcV on line 46 Warning: assert(): assert(test(['' => '', 1 => 'a']) === true) failed in /in/V3bcV on line 49 Warning: assert(): assert(test(['' => '', 0 => '']) === true) failed in /in/V3bcV on line 50 Warning: assert(): assert(test([0 => '', 'a' => 'a']) === true) failed in /in/V3bcV on line 51 Warning: assert(): assert(test([' 0' => '']) === true) failed in /in/V3bcV on line 54 Warning: assert(): assert(test(['00' => '']) === true) failed in /in/V3bcV on line 55 Warning: assert(): assert(test(['0*' => '']) === true) failed in /in/V3bcV on line 56 Warning: assert(): assert(test(['0.0' => '']) === true) failed in /in/V3bcV on line 57 Warning: assert(): assert(test(['0x0' => '']) === true) failed in /in/V3bcV on line 58 Warning: assert(): assert(test(['0e0' => '']) === true) failed in /in/V3bcV on line 59
Output for 5.4.9 - 5.6.28: Warning: assert(): Assertion failed in /in/V3bcV on line 29 Warning: assert(): Assertion failed in /in/V3bcV on line 32 Warning: assert(): Assertion failed in /in/V3bcV on line 33 Warning: assert(): Assertion failed in /in/V3bcV on line 34 Warning: assert(): Assertion failed in /in/V3bcV on line 35 Warning: assert(): Assertion failed in /in/V3bcV on line 36 Warning: assert(): Assertion failed in /in/V3bcV on line 37 Warning: assert(): Assertion failed in /in/V3bcV on line 38 Warning: assert(): Assertion failed in /in/V3bcV on line 39 Warning: assert(): Assertion failed in /in/V3bcV on line 40 Warning: assert(): Assertion failed in /in/V3bcV on line 41 Warning: assert(): Assertion failed in /in/V3bcV on line 42 Warning: assert(): Assertion failed in /in/V3bcV on line 45 Warning: assert(): Assertion failed in /in/V3bcV on line 46 Warning: assert(): Assertion failed in /in/V3bcV on line 49 Warning: assert(): Assertion failed in /in/V3bcV on line 50 Warning: assert(): Assertion failed in /in/V3bcV on line 51 Warning: assert(): Assertion failed in /in/V3bcV on line 54 Warning: assert(): Assertion failed in /in/V3bcV on line 55 Warning: assert(): Assertion failed in /in/V3bcV on line 56 Warning: assert(): Assertion failed in /in/V3bcV on line 57 Warning: assert(): Assertion failed in /in/V3bcV on line 58 Warning: assert(): Assertion failed in /in/V3bcV on line 59
Output for 5.3.19 - 5.3.29: Parse error: syntax error, unexpected '[', expecting ')' in /in/V3bcV on line 29
Process exited with code 255.