usort

问题 I been working on a problem for hours now and it seems I can not find a way to get the above sorting to work. In an magento project (im relatively new to magento) I have to sort the collection first by subcategory, then an attribute and last by the product name. is Anchor is set to ture with all categories, so parent categories also show subcategory products. I came across an idea of using the ReflectionObject using the usort() PHP function with an comparator function, like this: private

问题 I been working on a problem for hours now and it seems I can not find a way to get the above sorting to work. In an magento project (im relatively new to magento) I have to sort the collection first by subcategory, then an attribute and last by the product name. is Anchor is set to ture with all categories, so parent categories also show subcategory products. I came across an idea of using the ReflectionObject using the usort() PHP function with an comparator function, like this: private

问题 I'm using usort to sort an array with an associative array within each element. When all of the values I am sorting on in the array are the same then it still changes the position of the elements in the array, is there a way to prevent this? For example this: array( array('name' => 'Ben', 'authn_weight' => 85.3), array('name' => 'Josh', 'authn_weight' => 85.3), array('name' => 'Fred', 'authn_weight' => 85.3) ); May be changed to this: array( array('name' => 'Josh', 'authn_weight' => 85.3),

问题 array(10) { [1019]=> array(3) { ["quantity"]=> int(0) ["revenue"]=> int(0) ["seller"]=> string(5) "Lenny" } [1018]=> array(3) { ["quantity"]=> int(5) ["revenue"]=> int(121) ["seller"]=> string(5) "Lenny" } [1017]=> array(3) { ["quantity"]=> int(2) ["revenue"]=> int(400) ["seller"]=> string(6) "Anette" } [1016]=> array(3) { ["quantity"]=> int(25) ["revenue"]=> int(200) ["seller"]=> string(6) "Samuel" } [1015]=> array(3) { ["quantity"]=> int(1) ["revenue"]=> int(300) ["seller"]=> string(6)

问题 I have a web application that runs fine on our Linux servers but when running on Mac OS with the Zend Community Edition Server using PHP 5.3 we get the error: usort(): Array was modified by the user comparison function every time a page loads for the first time (it takes about 2 minutes for a page to tick over and load, on the linux servers the page loads in 1 second). Has anyone else experienced this or has any idea how I can fix the problem, I have tried playing around with PHP and Apache

问题 I have an array like the following: Array ( [0] => Array ( 'name' => "Friday" 'weight' => 6 ) [1] => Array ( 'name' => "Monday" 'weight' => 2 ) ) I would like to grab the last values in that array (the 'weight'), and use that to sort the main array elements. So, in this array, I'd want to sort it so the 'Monday' element appears before the 'Friday' element. 回答1: You can use usort as: function cmp($a, $b) { return $a['weight'] - $b['weight']; } usort($arr,"cmp"); 回答2: Can be done using an

问题 I have an usort() example and I added some echo statements to see how the code works: <?php function list_cmp($a, $b) { global $order; echo "\$a=$a, \$b=$b </br>"; foreach ($order as $key => $value) { echo "\$value=$value </br>"; if ($a == $value) { echo "\$a=\$value, returing 0. </br>"; return 0; } if ($b == $value) { echo "\$b=\$value, returing 1. </br>"; return 1; } } } $order[0] = 1; $order[1] = 3; $order[2] = 4; $order[3] = 2; $array[0] = 2; $array[1] = 1; $array[2] = 3; $array[3] = 4;

问题 My array looks like this Array ( [0] => Array ( [last_name] => Kournikova [first_name] => Anna [gender] => Female [date_of_birth] => 6/3/1975 [favorite_color] => Red ) [1] => Array ( [last_name] => Hingis [first_name] => Martina [gender] => Female [date_of_birth] => 4/2/1979 [favorite_color] => Green ) [2] => Array ( [last_name] => Seles [first_name] => Monica [gender] => Female [date_of_birth] => 12/2/1973 [favorite_color] => Black ) [3] => Array ( [last_name] => Abercrombie [first_name] =>

问题 There's an answer here: Combine two array and order this new array by date It explains how two arrays can be merged and then sorted by date. function cmp($a, $b){ $ad = strtotime($a['date']); $bd = strtotime($b['date']); return ($ad-$bd); } $arr = array_merge($array1, $array2); usort($arr, 'cmp'); the solution looks quite elegant, but I'm confused by return ($ad-$bd); I mean there's no comparison operator, it just subtracts function newFunc($a, $b) { return($a-$b); } echo newFunc(5,3);

问题 How can I use usort to sort an associative array inside a symfony2 controller? //sort function compare($a, $b) { return strnatcmp($a['sort'], $b['sort']); } usort($content, 'compare'); That gives me the following error: Warning: usort() expects parameter 2 to be a valid callback, function 'compare' not found or invalid function name as does putting it in its own private function like this // sort usort($content, '$this->compare'); return $content; } //sort private function compare($a, $b) {