Online PHP editor | output for JE5r8

@ 2020-01-15T03:11:58Z

<?php
mb_regex_encoding('SJIS');
$string = "my number is 63735";
$pattern = "63735";
$packed = pack('n', "63735");
//before convert to ASCII: f8f7
var_dump(bin2hex($packed));


$replacement = mb_convert_encoding($packed, "SJIS", "ASCII");
//after convert to ASCII: 3f8180
var_dump(bin2hex($replacement));

//after converting back to SJIS:
var_dump(bin2hex(mb_convert_encoding($replacement, "UTF-8", "SJIS")));


//expected result: my number is ��
//OK
$new_string = mb_ereg_replace($pattern, $replacement, $string);

//expected result: my new number is ��
//but it returns NULL.
$ret = mb_ereg_replace("number", "new number", $new_string);
var_dump($ret);
var_dump(mb_convert_encoding($ret, "UTF-8", "SJIS"));

Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: string(4) "f8f7" string(4) "3f3f" string(4) "3f3f" string(19) "my new number is ??" string(19) "my new number is ??"
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 string(4) "f8f7" string(4) "3f3f" string(4) "3f3f" string(19) "my new number is ??" string(19) "my new number is ??"
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: string(4) "f8f7" string(6) "3f8180" string(6) "3fc3b7" string(20) "my new number is ?��" string(20) "my new number is ?÷"

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