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14 years ago
Avoiding use of preg_match to detect if utf8_encode is needed:



<?php

                $string = $string_input; // avoid being destructive



                $string = preg_replace("#[\x09\x0A\x0D\x20-\x7E]#"        ,"",$string);         // ASCII

                $string = preg_replace("#[\xC2-\xDF][\x80-\xBF]#"            ,"",$string);             // non-overlong 2-byte

                $string = preg_replace("#\xE0[\xA0-\xBF][\x80-\xBF]#"    ,"",$string);     // excluding overlongs

                $string = preg_replace("#[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}#","",$string);     // straight 3-byte

                $string = preg_replace("#\xED[\x80-\x9F][\x80-\xBF]#"    ,"",$string);     // excluding surrogates

                $string = preg_replace("#\xF0[\x90-\xBF][\x80-\xBF]{2}#","",$string);     // planes 1-3

                $string = preg_replace("#[\xF1-\xF3][\x80-\xBF]{3}#"    ,"",$string);     //  planes 4-15

                $string = preg_replace("#\xF4[\x80-\x8F][\x80-\xBF]{2}#","",$string);     // plane 16



                $rc = ($string == ""?true:false);

?>
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