Online PHP editor | output for WaaKY

@ 2018-08-31T21:38:59Z

<?php
function decrement($str) {
  $index = strlen($str)-1;
  $ord = ord($str[$index]);
  if ($ord > 65) {
    // The final character is still greater than A, decrement
    return substr($str, 0, $index) . chr($ord-1);
  }
  if ($index > 0) {
    // Strip the final 2 characters and append a Z 
    return substr($str, 0, $index-1) . 'Z';
  }
  // Can't be decremented
  return false;
}

var_dump(
 decrement('A'),
 decrement('AA'),
 decrement('AAAA'),
 decrement('XXXZ')
);

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: bool(false) string(1) "Z" string(3) "AAZ" string(4) "XXXY"
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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