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<?php $targets = array('\\','/',':','*','?','"','<','>','|','-'); $replace = '_'; $samples = array( 'c:\Windows\win.com', '/chat/stackoverflow/com/rooms/11.php', 'I like goats' ); print '<table>'; $results = array(); foreach ($samples as $s) { print '<tr><td>'.$s.'</td><td>'.str_replace($targets, $replace, $s).'</td><tr>'; } print '</table>';
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<table><tr><td>c:\Windows\win.com</td><td>c__Windows_win.com</td><tr><tr><td>/chat/stackoverflow/com/rooms/11.php</td><td>_chat_stackoverflow_com_rooms_11.php</td><tr><tr><td>I like goats</td><td>I like goats</td><tr></table>

preferences:
229.12 ms | 406 KiB | 363 Q