--TEST--
DOMXPath Tests
--EXTENSIONS--
dom
--FILE--
<?php
require_once("dom_test.inc");

function MyAverage($nodelist) {
    $count = 0;
    $val = 0;
    foreach ($nodelist AS $node) {
        $count++;
        $val += $node->textContent;
    }
    if ($val > 0) {
        return $val/$count;
    } else {
        return 0;
    }
}

$dom = new DOMDocument;
$dom->loadXML('<root xmlns="urn::default"><child>myval</child></root>');

$xpath = new DOMXPath($dom);

$xpath->registerPHPFunctions('MyAverage');
$xpath->registerNamespace("php", "http://php.net/xpath");

$xpath->registerNamespace("def", "urn::default");
$nodelist = $xpath->query("//def:child");
if ($node = $nodelist->item(0)) {
    print $node->textContent."\n";
}

$count = $xpath->evaluate("count(//def:child)");

var_dump($count);

$xpathdoc = $xpath->document;

var_dump($xpathdoc instanceof DOMDocument);

$root = $dom->documentElement;
$root->appendChild($dom->createElementNS("urn::default", "testnode", 3));
$root->appendChild($dom->createElementNS("urn::default", "testnode", 4));
$root->appendChild($dom->createElementNS("urn::default", "testnode", 4));
$root->appendChild($dom->createElementNS("urn::default", "testnode", 5));

$avg = $xpath->evaluate('number(php:function("MyAverage", //def:testnode))');
var_dump($avg);

try {
    $xpath->registerPHPFunctions('non_existent');
    $avg = $xpath->evaluate('number(php:function("non_existent", //def:testnode))');
} catch (\Error $e) {
    echo $e->getMessage() . \PHP_EOL;
}
try {
    $xpath->registerPhpFunctions(['non_existant']);
    $avg = $xpath->evaluate('number(php:function("non_existent", //def:testnode))');
} catch (\Error $e) {
    echo $e->getMessage() . \PHP_EOL;
}
?>
--EXPECT--
myval
float(1)
bool(true)
float(4)
DOMXPath::registerPhpFunctions(): Argument #1 ($restrict) must be a callable, function "non_existent" not found or invalid function name
DOMXPath::registerPhpFunctions(): Argument #1 ($restrict) must be an array with valid callbacks as values, function "non_existant" not found or invalid function name