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run code in 150+ php & hhvm versions
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<?php function unicode2utf8($c){ $output=""; if($c < 0x80) { return chr($c); } else if($c < 0x800) { return chr( 0xc0 | ($c >> 6) ).chr( 0x80 | ($c & 0x3f) ); } else if($c < 0x10000) { return chr( 0xe0 | ($c >> 12) ).chr( 0x80 | (($c >> 6) & 0x3f) ).chr( 0x80 | ($c & 0x3f) ); } else if($c < 0x200000) { return chr(0xf0 | ($c >> 18)).chr(0x80 | (($c >> 12) & 0x3f)).chr(0x80 | (($c >> 6) & 0x3f)).chr(0x80 | ($c & 0x3f)); } return false; } function sanitizeFileName( $name ) { $invalidCharacters = array("\x2f", "\x22", "\x2a", "\x3a", "\x3c", "\x3e", "\x3f", "\x5c", "\x7f"); $name = str_replace($invalidCharacters, '', $name); $name = preg_replace('$[\x{0000}-\x{001F}]$u', '', $name); return $name; } $str = "blablabla ǹéñ~# - ".unicode2utf8(0xE001).' - '.unicode2utf8(0xFDD3).' - '.unicode2utf8(0xFD00); var_dump($str); var_dump(sanitizeFileName($str));
Output for 4.3.0 - 5.3.23, 5.4.0 - 5.4.13, 5.4.41 - 7.1.0
string(36) "blablabla ǹéñ~# -  - ﷓ - ﴀ" string(36) "blablabla ǹéñ~# -  - ﷓ - ﴀ"
Output for 5.3.24 - 5.3.29, 5.4.14 - 5.4.40
string(36) "blablabla ǹéñ~# -  - ﷓ - ﴀ" NULL