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@ 2017-05-24T21:16:55Z

<?php

$s =  [ 25, 12, 23, 1006, 13, 114, 11, 34, 18, 13, 112 ];
sort($s);

$func = function($a, $b){
 
  $first_digitA = substr($a, 0, 1);
  $first_digitB = substr($b, 0, 1);

  if($first_digitA < $first_digitB){
    return -1;
  }
  else
  if( $first_digitA > $first_digitB ){
    return 1;
  }
  else
  {
      return 0;
  }
};

usort($s, $func);

print_r($s);

Output
Performance
VLD
References
Branches

substr: documentation ( source)
print_r: documentation ( source)
sort: documentation ( source)
usort: documentation ( source)

preferences:dark modelive previewkey bindings

35.94 ms | 407 KiB | 5 Q