1--TEST--
2Test mb_substr() function : error conditions - Pass an unknown encoding
3--SKIPIF--
4<?php
5extension_loaded('mbstring') or die('skip');
6function_exists('mb_substr') or die("skip mb_substr() is not available in this build");
7?>
8--FILE--
9<?php
10/*
11 * Pass an unknown encoding to mb_substr() to test behaviour
12 */
13
14echo "*** Testing mb_substr() : error conditions ***\n";
15
16$str = 'Hello, world';
17$start = 1;
18$length = 5;
19$encoding = 'unknown-encoding';
20
21try {
22    var_dump( mb_substr($str, $start, $length, $encoding));
23} catch (\ValueError $e) {
24    echo $e->getMessage() . \PHP_EOL;
25}
26
27?>
28--EXPECT--
29*** Testing mb_substr() : error conditions ***
30mb_substr(): Argument #4 ($encoding) must be a valid encoding, "unknown-encoding" given
31