Remove control characters from PHP string

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If you mean by control characters the first 32 ascii characters and \x7F (that includes the carriage return, etc!), then this will work:

preg_replace('/[\x00-\x1F\x7F]/', '', $input);

(Note the single quotes: with double quotes the use of \x00 causes a parse error, somehow.)

The line feed and carriage return (often written \r and \n) may be saved from removal like so:

preg_replace('/[\x00-\x09\x0B\x0C\x0E-\x1F\x7F]/', '', $input);

I must say that I think Bobby’s answer is better, in the sense that [:cntrl:] better conveys what the code does than [\x00-\x1F\x7F].

WARNING: ereg_replace is deprecated in PHP >= 5.3.0 and removed in PHP >= 7.0.0!, please use preg_replace instead of ereg_replace:

preg_replace('/[[:cntrl:]]/', '', $input);

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