Today, in a scenario, you need to get the maximum key value of an array,
For example:
$arr = array(
11 => 1,
6 => 2,
9 => 5,
21 => 1
);If you want to get 21, then you have to
$maxKey = 0;
foreach( $arr as $k => $v ) {
if( $k > $maxKey ) {
$maxKey = $k;
}
}I thought this was more troublesome, but later I checked the information and found that this is also possible. ,
ksort( $arr ); end( $arr ); echo key( $arr );
There is also this way, reverse the array, and then get the maximum value, but this will change the array
echo max( array_flip($arr) );
$keys = array_keys($arr); echo max($keys);
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The above introduces how to get the key value of the last element of the array, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.
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