php - What is the fastest way to search for two things in an array of arrays? -


if have 2 numbers: state_id , product_id best way find out if pair exists element within array? here array looks like:

array (     [0] => array         (             [stateproduct_id] => 1             [state_id] => 2             [product_id] => 1             [stateproduct_price] => 160         )      .....      [102] => array         (             [stateproduct_id] => 103             [state_id] => 10             [product_id] => 5             [stateproduct_price] => 210         ) )

i thinking of iterating through each element , having if statement tests whether number pairs 1 array match both state_id , product_id @ current element being tested against in loop. want happen if match, (update price). best way go it? there match every number pair.

this current setup:

for($i = 0; $i < count($myownarray); $i++){     for($n = 0; $n < count($stateproductpricesarray); $n++){         if(    $stateproductpricesarray[$n]['state_id'] == $myownarray[$i]['state_id']             &&  $stateproductpricesarray[$n]['product_id'] == $myownarray[$i]['product_id']){             //do something. update price myownarray grabbing price stateproductpricesarray            }     } }

is best way go it, or there faster way search 2 numbers in array dictionaries?

your algorithm o(n2), slow , not @ scaleable.

instead, consider pre-populating lookup:

$separator = " -- "; // separator okay, long doesn't appear in values $map = array(); foreach($stateproductpricearray $i=>$item) {     $map[$item['state_id'].$separator.$item['product_id']] = $i; }  foreach($myownarray $row) {     if( isset($map[$row['state_id'].$separator.$row['product_id']])) {         $product = $stateproductpricearray[$map[$row['state_id'].$separator.$row['product_id']]];         // something!     } }

much faster ^_^


Comments

Post a Comment

Popular posts from this blog

apache - Remove .php and add trailing slash in url using htaccess not loading css -

i have add following code htaccess file removing .php extension , add trailing slash urls. worked fine reduced page loading speed , css code not loading @ all. pages ugly. please help rewriteengine on rewritebase / ## hide .php extension snippet # externally redirect /dir/foo.php /dir/foo rewritecond %{the_request} ^[a-z]{3,}\s([^.]+)\.php [nc] rewriterule ^ %1/ [r,l] # add trailing slash rewritecond %{request_filename} !-f rewritecond %{request_uri} !/$ rewriterule . %{request_uri}/ [l,r=301] # internally forward /dir/foo /dir/foo.php rewritecond %{request_filename} !-d rewritecond %{request_filename}.php -f rewriterule ^(.*?)/?$ $1.php [l] we can rewrite urls using .htaccess files. before writing in .htaccess files need verify kind of server using. can check server adding a <?php phpinfo(); ?> in php page. ensure mod_rewrite module enabled in apache server. can identified checking phpinfo included page. common methods used url rewriting follows ...
Read more

javascript - jQuery show full size image on click -

pretty self explanatory not workking . i want display full image when user click on image... yes know there tons of plugins but i want keep simple. any idea ? css : .full { display: none; width: 500px; height: 500px; margin-left: 100px; margin-top: -300px; position: fixed; background-color: #f00; z-index: 6; } .thumbnail { width: 50px; height: 50px; } html: <img class="thumbnail" src="http://4.bp.blogspot.com/-uhbdp2esxng/txneptvi92i/aaaaaaaaaky/upfqis7zto0/s1600/rihanna-wallpaper.jpg"> jquery: $(document).ready(function() { $('.thumbnail').on('click', function() { var img = $('<img />',{src:this.src,'class':'full'}); $('.full').html(img).show(); console.log('done!'); }); }); try looking how jquery works. $(document).ready(function() { $('.thumbnail').on('click', function(...
Read more