PHP: Case-insensitive “array_diff”

问题

I have following two arrays and the code to find array_diff:

$obs_ws = array("you", "your", "may", "me", "my", "etc");
$all_ws = array("LOVE", "World", "Your", "my", "etc", "CoDe");

$final_ws = array_diff($all_ws, $obs_ws);

Above code giving output array as:

$final_ws = array("LOVE", "World", "Your", "CoDe");

But I want it as:

$final_ws = array("LOVE", "World", "CoDe");

Note "Your" is not removed, it may be due to "Y" is in caps in second array. I want to exclude "Your" also, so is there any case-insensitive version of array_diff in PHP.

I tried array_udiff but I am not getting exactly how to use this in my problem

Thanks

回答1:

Try to pass strcasecmp as third parameter to array_udiff function:

<?php
$obs_ws = array("you", "your", "may", "me", "my", "etc");
$all_ws = array("LOVE", "World", "Your", "my", "etc", "CoDe");

$final_ws = array_udiff($all_ws, $obs_ws, 'strcasecmp');

print_r($final_ws);

Output:

Array
(
    [0] => LOVE
    [1] => World
    [5] => CoDe
)

回答2:

You were on the right track. This is my suggestion:

function array_casecmp($arr1,$arr2){
    return array_udiff($arr1,$arr2,'strcasecmp');
}


$obs_ws = array("you", "your", "may", "me", "my", "etc");
$all_ws = array("LOVE", "World", "Your", "my", "etc", "CoDe");
var_dump( array_casecmp($all_ws,$obs_ws) );

来源：https://stackoverflow.com/questions/1875862/php-case-insensitive-array-diff