Online PHP editor | output for 2eCbt

@ 2017-07-03T13:44:01Z

<?php

if (defined('HHVM_VERSION')) {
   exit;
}

function refcount($var)
{
    ob_start();
    debug_zval_dump($var);
    $dump = ob_get_clean();

    $matches = array();
    preg_match('/refcount\(([0-9]+)/', $dump, $matches);

    $count = $matches[1];

    //3 references are added, including when calling debug_zval_dump()
    return $count - 3;
}

$array = array('foo' => 'bar');
var_dump(refcount($array));
$copy = $array;
var_dump(refcount($array));
var_dump(refcount($copy));
current($copy);
var_dump(refcount($array));
var_dump(refcount($copy));

Output for 4.4.1, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: int(1) int(2) int(2) int(2) int(2)
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 int(1) int(2) int(2) int(2) int(2)
Output for 7.0.0 - 7.0.33: int(0) int(1) int(1) int(1) int(1)
Output for 4.3.0 - 4.3.11, 4.4.0, 4.4.2 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40: int(1) int(2) int(2) int(1) int(1)

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