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  1. <?php
  2. // mb_convert_encodingを重ね掛けしたらどうなるか、という実験
  3. $charsets = ['utf-8', 'sjis', 'eucjp', 'iso-2022-jp'];
  4. $input = 'あｱ儀@☆';
  5.  
  6. foreach($charsets as $enc) {
  7. 	foreach($charsets as $inenc) {
  8. 		if($inenc === $enc) continue;
  9.  
  10. 		echo "$inenc->$enc: ";
  11. 		mb_internal_encoding('utf-8');
  12. 		$s = mb_convert_encoding($input, $inenc);
  13. 		mb_internal_encoding($inenc);
  14. 		$s = mb_convert_encoding($s, $enc);
  15. 		echo base64_encode($s), " ";
  16. 		$s = mb_convert_encoding($s, $enc);
  17. 		echo base64_encode($s), "\n";
  18. 	}
  19. }
Success #stdin #stdout 0.02s 24448KB
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stdin
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Standard input is empty
stdout
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sjis->utf-8: 44GC772x5YSAQOKYhg== 57i644KR7729772x6JyGP0DnrJg=
eucjp->utf-8: 44GC772x5YSAQOKYhg== Pz/pkJTmgKg/P0A/Pw==
iso-2022-jp->utf-8: 44GCP+WEgEDimIY= Pz8/Pz8/P0A/Pz8=
utf-8->sjis: gqCxi1ZAgZk= Pz8/P1ZAPz8=
eucjp->sjis: gqCxi1ZAgZk= Pz8/VkA/Pw==
iso-2022-jp->sjis: gqA/i1ZAgZk= Pz8/P1ZAPz8=
utf-8->eucjp: pKKOsbW3QKH5 Pz8/Pz8/QD8/
sjis->eucjp: pKKOsbW3QKH5 jqSOoryzjrWOt0COoQ==
iso-2022-jp->eucjp: pKI/tbdAofk= jqSOoj+OtY63QI6hPw==
utf-8->iso-2022-jp: GyRCJCIbKEI/GyRCNTcbKEJAGyRCIXkbKEI= GyRCJCIbKEI/GyRCNTcbKEJAGyRCIXkbKEI=
sjis->iso-2022-jp: GyRCJCIbKEI/GyRCNTcbKEJAGyRCIXkbKEI= GyRCJCIbKEI/GyRCNTcbKEJAGyRCIXkbKEI=
eucjp->iso-2022-jp: GyRCJCIbKEI/GyRCNTcbKEJAGyRCIXkbKEI= GyRCJCIbKEI/GyRCNTcbKEJAGyRCIXkbKEI=
https://ideone.com/LVFBNM
mb_convert_encodingを重ね掛けしたらどうなるか、という実験
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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