PHP difference operation function array_diff and array traversal

This article mainly introduces the PHP difference operation function array_diff and array traversal. Interested friends can refer to it. I hope it will be helpful to everyone.

The example of this article describes the method of deleting elements based on the element value in PHP associative array, as follows:

<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green");
$result = array_diff($array1, $array2);
//这样就相当于删除$array1里的值为"green"的元素。
print_r($result);
?>

There is another method, which is more complicated than the above, but the effect is the same:

function removeArrayElement(&$ar,$val)
{
$tmp = array();
foreach($ar as $k => $arc)
{
  if($arc!=$val)
  {
  $tmp[$k]=$arc;
  }
}
$ar = $tmp;
unset($tmp);
}

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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