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@ 2017-02-04T03:15:14Z

<?php
header('Content-Type: text/html; charset=UTF-8');

$str = "<h1>He'llü & Wor&#39;ldÆØÅÅÅ!</h1>" . "\tcafé\n";
if ('UTF-8' !== mb_detect_encoding($str)) {
    $str = utf8_encode($str);
}
var_dump($str);

$str = html_entity_decode($str, ENT_QUOTES | ENT_XML1, 'UTF-8');
var_dump($str);

$str = filter_var(html_entity_decode($str, ENT_QUOTES | ENT_XML1, 'UTF-8'), 
        FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_LOW | FILTER_FLAG_STRIP_HIGH | FILTER_FLAG_NO_ENCODE_QUOTES);
var_dump($str);

#$newstr = preg_replace('/\s[\s]+/', ' ', $str);  // Strip off multiple spaces 
$newstr = preg_replace('/[^\000-\128]+/', '', $str);  // Strip off non-alpha-numeric
#$newstr = preg_replace('/[\s\W]+/', '-', $newstr);  // Strip off spaces and non-alpha-numeric
#$newstr = preg_replace('/[^A-Za-z0-9_-]+/', '', $newstr);

var_dump($newstr);

Output for git.master, git.master_jit, rfc.property-hooks: string(47) "<h1>He'llü & Wor'ldÆØÅÅÅ!</h1> café " string(43) "<h1>He'llü & Wor'ldÆØÅÅÅ!</h1> café " Deprecated: Constant FILTER_SANITIZE_STRING is deprecated in /in/mbs0r on line 14 string(18) "He'll & Wor'ld!caf" string(0) ""

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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