Online PHP editor | output for VvVcc

@ 2019-02-12T00:35:54Z

<?php
function stripSpecialCharater($string)
{
    return preg_replace(['/\s{2,}|[\t\R]/u', '/[^a-z\d\s&‚~§©ÂÃâƒ€-]/ui'], [' ', ''], $string);
    //$string = iconv("Windows-1252","UTF-8",urldecode($string));
    //$string = preg_replace(array('/\s{2,}/', '/[\t\n]/'), ' ', $string);
    //return preg_replace('/[^a-zA-Z0-9Ã§&-©‚Âƒâ€˜\s]/', '', $string);
}

$tests = ['12   34', 'adsf', 'co©',  'pound      £'];

foreach ($tests as $test) {
    echo "$test : ";
    var_export(stripSpecialCharater($test));
    echo "\n";
}

Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13: 12 34 : Warning: preg_replace(): Compilation failed: escape sequence is invalid in character class at offset 11 in /in/VvVcc on line 4 NULL adsf : Warning: preg_replace(): Compilation failed: escape sequence is invalid in character class at offset 11 in /in/VvVcc on line 4 NULL co© : Warning: preg_replace(): Compilation failed: escape sequence is invalid in character class at offset 11 in /in/VvVcc on line 4 NULL pound £ : Warning: preg_replace(): Compilation failed: escape sequence is invalid in character class at offset 11 in /in/VvVcc on line 4 NULL
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33: 12 34 : '12 34' adsf : 'adsf' co© : 'co©' pound £ : 'pound '

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