如果在数组内部某些字符串相似，我如何比较两个数组？

Question

I simply want to compare two strings

$result = array_diff($original, $new);

var_dump $original:

array(4) {
  [0]=>
  string(4) "8344"
  [1]=>
  string(4) "7076"
  [2]=>
  string(7) "6220940"
  [3]=>
  string(7) "6220940"
}

var_dump $new:

array(4) {
  [0]=>
  string(4) "8344"
  [1]=>
  string(4) "7076"
  [2]=>
  string(14) "6220940mistake"
  [3]=>
  string(7) "6220940"
}

var_dump $result:

array(0) {
}

But what I actually expect would be var_dump $result:

array(1) {
  [2]=>
  string(7) "6220940"
}

I found out that this is happening because I have two strings that are similar. So if every string is unique, there is no problem. But I do sometimes have also similar strings inside my array. Can you help me with this problem?

Answer 1

<?php
$a = array("8344", "7076", "6220940", "6220940");
$b = array("8344", "7076", "6220940mistake", "6220940");

var_export(array_diff_assoc($a,$b));

prints

array (
  2 => '6220940',
)

see array_diff_assoc