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    <p>You can use not only an anonymous function but a closure, like e.g.</p> <pre><code>function ($a,$b) use ($sort) { ... } </code></pre> <p>and $sort will be available in the function body. Self-contained example:</p> <pre><code>&lt;?php function getFn($sort) { return function($a, $b) use($sort) { if($a-&gt;$sort &gt; $b-&gt;$sort) return 1; if($a-&gt;$sort &lt; $b-&gt;$sort) return -1; return 0; }; } $abuseCases = array( (object)array('ID'=&gt;1, 'Sender'=&gt;'Sender A'), (object)array('ID'=&gt;3, 'Sender'=&gt;'Sender D'), (object)array('ID'=&gt;2, 'Sender'=&gt;'Sender C'), (object)array('ID'=&gt;4, 'Sender'=&gt;'Sender B') ); echo "\n----- Sort By Sender ----\n"; usort($abuseCases, getFn('Sender')); foo($abuseCases); echo "\n----- Sort By ID ----\n"; usort($abuseCases, getFn('ID')); foo($abuseCases); function foo($a) { foreach($a as $o) { echo $o-&gt;ID, ' ', $o-&gt;Sender, "\n"; } } </code></pre> <p>prints</p> <pre><code>----- Sort By Sender ---- 1 Sender A 4 Sender B 2 Sender C 3 Sender D ----- Sort By ID ---- 1 Sender A 2 Sender C 3 Sender D 4 Sender B </code></pre> <hr> <p><strong>Update</strong>: With php&lt;5.3 you can use an object instead of an anonymous function. usort() expects the second parameter to be a <code>callable</code>. That can be an anoymous function as of php 5.3, but it can also be the name of a function ....or an object and a method name passed as an array like <code>array($obj, 'methodName')</code>.</p> <pre><code>$abuseCases = getData(); echo "\n----- Sort By Sender ----\n"; usort($abuseCases, array(new Foo('Sender'), 'compare')); foo($abuseCases); echo "\n----- Sort By ID ----\n"; usort($abuseCases, array(new Foo('ID'), 'compare')); foo($abuseCases); class Foo { public $propName; // protected? public function __construct($propertyName) { $this-&gt;propName = $propertyName; } public function compare($a, $b) { $prop = $this-&gt;propName; if($a-&gt;$prop &gt; $b-&gt;$prop) return 1; if($a-&gt;$prop &lt; $b-&gt;$prop) return -1; return 0; } } function foo($a) { foreach($a as $o) { echo $o-&gt;ID, ' ', $o-&gt;Sender, "\n"; } } function getData() { return array( (object)array('ID'=&gt;1, 'Sender'=&gt;'Sender A'), (object)array('ID'=&gt;3, 'Sender'=&gt;'Sender D'), (object)array('ID'=&gt;2, 'Sender'=&gt;'Sender C'), (object)array('ID'=&gt;4, 'Sender'=&gt;'Sender B') ); } </code></pre> <p>(If you make heavy use of this - or don't want to write excuses like this one -_- - you might want to define an interface like <code>interface Comparator { ... }</code>, let Foo implement that interface and have some function/class that uses Comparator, i.e. a wrapper for objects around usort().)</p>
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    1. POPHP Sort function for sorting an array of objects
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    1. COA good example of closures usage. Works only with PHP 5.3+
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    2. COWorks perfectly. Thanks! If there's a version of the same result that requires less code I'd love to see that too :P
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    3. COSorry turns out PHP 5.3 wont be available - I need another solution
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