PHP - Add null character to string -

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i'm trying append number of null characters '\0' string in php.

$s = 'hello'; while(strlen($s) < 32) $s .= '\0';

however, php adds 2 characters (\ , 0), instead of escaping character , adding null. know add null character string?

i don't know if \0 correct in case, should use ":

$s = 'hello'; while(strlen($s) < 32) $s .= "\0";

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