php - preg_replace make matched hex value appear as text -


how use preg_replace convert matching hex values text representation of hex?

$string = 'abcd'.hex2bin(23).'abc'.hex2bin(24);

for example str_replace('/[\x20-\x25]/', 'what here?', $string) output like:

abcd[hex:23]abc[hex:24]

what want do: i'm looking hidden characters, , want display hex values.

you need preg_replace_callback() have callback called against matches.

try:

$string = 'abcd'.hex2bin(23).'abc'.hex2bin(24);  $text = preg_replace_callback('/[\\x20-\\x25]/', function($matches) {     $string = bin2hex($matches[0]);     return "[hex:{$string}]"; }, $string);

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