Comments on: Searching Arrays for Values http://www.brandonsavage.net/searching-arrays-for-values/ The personal blog of Brandon Savage. Contains entries of a personal and professional nature focusing on PHP, Apple, LAMP, MySQL and Washington, DC. Thu, 29 Jul 2010 11:09:38 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Rory http://www.brandonsavage.net/searching-arrays-for-values/#comment-599 Rory Tue, 14 Jul 2009 01:18:50 +0000 http://dev.brandonsavage.net/?p=105#comment-599 This post is old but people never make use of all the great built-in array functions: $exclude = array('submit' => true, 'go' => true); $valid = array_diff_key($_POST, $exclude); This post is old but people never make use of all the great built-in array functions:

$exclude = array(‘submit’ => true, ‘go’ => true);

$valid = array_diff_key($_POST, $exclude);

]]> By: Brandon Savage http://www.brandonsavage.net/searching-arrays-for-values/#comment-454 Brandon Savage Wed, 22 Apr 2009 17:43:10 +0000 http://dev.brandonsavage.net/?p=105#comment-454 Jack, I have to disagree with your code sample. Simply doing if($array[$k]) will emit a notice if the array key does not exist. My code sample was designed to prevent this notice from being emitted. If you turn errors to E_ALL you'll see this notice, which I think we can both agree would slow down service of the site while the web server writes to the error logs. Jack, I have to disagree with your code sample. Simply doing if($array[$k]) will emit a notice if the array key does not exist. My code sample was designed to prevent this notice from being emitted. If you turn errors to E_ALL you’ll see this notice, which I think we can both agree would slow down service of the site while the web server writes to the error logs.

]]> By: jack http://www.brandonsavage.net/searching-arrays-for-values/#comment-453 jack Wed, 22 Apr 2009 17:39:30 +0000 http://dev.brandonsavage.net/?p=105#comment-453 Hi Brandon, Just browsing around and came across your other post on superglobals in classes, then this one. In the code above, the isset() call is redundant. Since you are setting the value to true, the following also works: if ($array[$k]) unset($_POST[$k]); On large arrays, this is MUCH faster than the in_array() method and -- I'd have to disagree with you -- more elegant, too. For large arrays, you can always create the array normally and then use the array_flip() method to exchange the keys and values. You just have to be careful with the zero array element, but that's easy to get around by starting your array indexes at one: $array = array(1 => 'somevalue', 'othervalue', 'newvalue'...); The indexes for othervalue, newvalue, etc... will now be 2, 3... You can then use array_flip() to exchange the keys and values in the array. Since any number, other than zero, evaluates to true, the if statement above will still work. --jack Hi Brandon,

Just browsing around and came across your other post on superglobals in classes, then this one.

In the code above, the isset() call is redundant. Since you are setting the value to true, the following also works:

if ($array[$k])
unset($_POST[$k]);

On large arrays, this is MUCH faster than the in_array() method and — I’d have to disagree with you — more elegant, too.

For large arrays, you can always create the array normally and then use the array_flip() method to exchange the keys and values. You just have to be careful with the zero array element, but that’s easy to get around by starting your array indexes at one:

$array = array(1 => ‘somevalue’, ‘othervalue’, ‘newvalue’…);

The indexes for othervalue, newvalue, etc… will now be 2, 3… You can then use array_flip() to exchange the keys and values in the array. Since any number, other than zero, evaluates to true, the if statement above will still work.

–jack

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