Online PHP editor | output for ea8i7

@ 2017-06-05T21:05:40Z

<?php

$x = "unchecked";
$a = array(1, 2, 3, "is_ref" => &$x);
foreach ($a as $k => $v) {
    if ($k !== "is_ref") {
        
        /* CODE FOR TESTING HERE */
        
        // This will cause a copy:
        //$a[$k] = null;
        //$v += 1;
        //$a[$k] = $v;
        
        // This won't:
        //var_dump($a);
    } else if (isset($x)) {
        $x = "was not copied";
        unset($x);
        $tmp = $a;
        $tmp["is_ref"] = "WAS COPIED!!!";
        unset($tmp);
        echo "######### \$a ".$a["is_ref"]."\n";
    }
}

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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: ######### $a was not copied
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 ######### $a was not copied

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