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  1. <?php
  2.  
  3. var_dump(substr('щаз', 0, 1));
  4. var_dump(strtoupper(substr('щаз', 0, 1)));
  5. var_dump(preg_match("/[А-Яа-я]/", strtoupper(substr('щаз', 0, 1))));
  6.  
  7. var_dump(mb_substr('щаз', 0, 1));
  8. var_dump(mb_strtoupper(mb_substr('щаз', 0, 1)));
  9. var_dump(preg_match("/[А-Яа-я]/", mb_strtoupper(mb_substr('щаз', 0, 1))));
  10.  
Success #stdin #stdout 0.02s 26336KB
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stdin
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Standard input is empty
stdout
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string(1) "�"
string(1) "�"
int(1)
string(2) "щ"
string(2) "Щ"
int(1)
https://ideone.com/4Sz3Lc
language:
PHP (php 7.3.5)
created:
3 years ago
visibility:
public

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