unset last item of array

in this code i try to unset first and last item of $status array

to unset but the las开发者_运维问答t item that i tried place thier pointer in $end

not unset what can I do for this reason?

$item[$fieldneedle] = " node_os_disk_danger ";
$status = preg_split('/_/',$item[$fieldneedle]);
unset($status[0]);
$end = & end($status);
unset($end);

in this example i need os_disk

array_shift($end); //removes first
array_pop($end); //removes last

Use explode instead of preg_split. It is faster. Then you can use array_pop and array_shift to remove an item from the end and beginning of the array. Then, use implode to put the remaining items back together again.

A better solution would be to use str_pos to find the first and last _ and use substr to copy the part inbetween. This will cause only one sting copy, instead of having to transform a string to array, modify that, and put the array together into a string. (Or don't you need to put them together? The 'I need 'os_disk' at the end confuses me).

$item[$fieldneedle] = " node_os_disk_danger ";
$status = preg_split('/_/',$item[$fieldneedle]);
$status = array_slice($status, 1, -1);

Well, if you want the result to be a string, why bother converting to a string?

$regex = '#^[^_]*_(.*?)_[^_]*$#';
$string = preg_replace($regex, '\\1', $string);

It replaces everything up to and including the first underscore character, and everything after and including the last underscore character. Nice, easy and efficient...

You can also use unset to remove last or any item with key

unset($status[0]); // removes the first item
unset($status[count($status) - 1]); // removes the last item

With regex, you can do:

$item[$fieldneedle] = preg_replace("/^[^_]+_(.+)_[^_]+$/", "$1", $item[$fieldneedle]);

regex:

^        : begining of the string
[^_]+    : 1 or more non _ 
_        : _
(.+)     : capture 1 or more characters
_        : _
[^_]+    : 1 or more non _
$        : end of string