Req #63818 [Com]: Need option to search in array keys instead of values
Edit report at https://bugs.php.net/bug.php?id=63818&edit=1
ID: 63818
Comment by: danielklein at airpost dot net
Reported by: dkadosh at affinegy dot com
Summary: Need option to search in array keys instead of
values
Status: Open
Type: Feature/Change Request
Package: PCRE related
Operating System: any
PHP Version: 5.3.20
Block user comment: N
Private report: N
New Comment:
How about this?
<?php
function preg_grep_keys($pattern, $input, $flags = 0) {
return array_intersect_key($input, array_flip(preg_grep($pattern, array_keys($input), $flags)));
}
?>
Previous Comments:
------------------------------------------------------------------------
[2012-12-20 17:06:30] dkadosh at affinegy dot com
Description:
------------
---
From manual page: http://www.php.net/function.preg-grep
---
I'm asking for an extra flag to this function, to cause it to do its search in the array keys
rather than in the values.
While there's a comment in the above page of how to "post-process" preg_grep()
results to achieve this, I'd rather it be done in C (inside the PCRE code) than PHP for
performance reasons.
I thought about something like this:
$a = array_flip( preg_grep('/Version$/', array_flip($aParams)) );
which would almost return what I want, HOWEVER it has two problems:
1) If certain values of $aParams are duplicated, the first array_flip() will "lose" those
rows in the array.
2) I'd incur a sizeable CPU and memory hit by calling array_flip, which duplicates the array(s)
in RAM.
Test script:
---------------
The current work-around:
function preg_grep_keys( $pattern, $input, $flags = 0 )
{
$keys = preg_grep( $pattern, array_keys( $input ), $flags );
$vals = array();
foreach ( $keys as $key )
{
$vals[$key] = $input[$key];
}
return $vals;
}
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=63818&edit=1
Thread (4 messages)