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  1. <?php
  2.  
  3.     function cmp ($a, $b) {
  4.          return strcmp(substr($a, 0, $num), substr($a, 0, $num));
  5.     }
  6.  
  7.     $terms = ['123a', '123z', '123b',];
  8.  	$num = 3;$thing=3;
  9.     usort($terms, [$num, $thing, "cmp"]);
  10.  
  11.     print_r($terms);
Success #stdin #stdout #stderr 0.03s 25768KB
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stdin
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Standard input is empty
stdout
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Array
(
    [0] => 123a
    [1] => 123z
    [2] => 123b
)
stderr
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PHP Warning:  usort() expects parameter 2 to be a valid callback, array must have exactly two members in /home/fvM5UX/prog.php on line 9
https://ideone.com/WMA5NN
language:
PHP (php 7.3.5)
created:
1 day ago
visibility:
public

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