PHP/Data Structure/extract

Add the prefix pts to each array key and then make each variable that results into a reference.

   <source lang="html4strict">

<?php $points = array("home" => 21, "away" => 13); extract($points, EXTR_REFS|EXTR_PREFIX_ALL, "pts"); $pts_home -= 4; $pts_away += 6;

printf("

%s

", var_export($points, TRUE));

?>

 </source>
   
  

extract( ) function converts elements into variables

   <source lang="html4strict">

//int extract ( array arr [, int options [, string prefix]] ) <?

   $Wales = "Wales";
   $capitalcities = array("England"=>"London","Scotland"=>"Edinburgh", "Wales"=>"Cardiff");
   extract($capitalcities);
   print $Wales;

?>

 </source>
   
  

Extracting Values from Arrays with extract()

   <source lang="html4strict">

<?php $customer = array("first" => "R", "last" => "W", "age" => 24, ); extract($customer);

print "

$first $last is $age years old.

";

extract($customer, EXTR_PREFIX_ALL, "cust");

print "

$cust_first $cust_last is $cust_age years old.

";

?>

 </source>
   
  

extract($points, EXTR_REFS|EXTR_PREFIX_ALL, "pts");

   <source lang="html4strict">

<?php

 $points = array("home" => 21, "away" => 13);
 extract($points, EXTR_REFS|EXTR_PREFIX_ALL, "pts");
 $pts_home -= 4;
 $pts_away += 6;

printf("

%s

", var_export($points, TRUE));

?>

 </source>
   
  

extract($scores, EXTR_PREFIX_ALL, "score");

   <source lang="html4strict">

<?php

 $scores = array(91, 56, 87, 79);
 extract($scores, EXTR_PREFIX_ALL, "score");

print "

$score_0

"; print "

$score_1

"; print "

$score_2

"; print "

$score_3

";

?>

 </source>
   
  

Using extract on an associative array

   <source lang="html4strict">

<?php $shapes = array("S" => "Cylinder",

               "N" => "Rectangle",
               "A" => "Sphere",
               "O" => "Sphere",
               "P" => "Rectangle");

extract($shapes); echo $Apple; echo "
"; echo $Notepad; ?>

 </source>
   
  

Using extract with the EXTR_PREFIX_ALL directive

   <source lang="html4strict">

<?php $Apple="Computer"; $shapes=array("S" => "Cylinder",

             "N" => "Rectangle",
             "A" => "Sphere",
             "O" => "Sphere",
             "P" => "Rectangle");

extract($shapes,EXTR_PREFIX_ALL,"shapes"); echo "Apple is $Apple.
"; echo "Shapes_Apple is $shapes_Apple"; echo "
"; echo "Shapes_NotePad is $shapes_NotePad"; ?>

 </source>
   
  

Using EXTR_PREFIX_ALL on a numeric array

   <source lang="html4strict">

<?php $shapes=array( "Cylinder",

              "Rectangle");

extract($shapes,EXTR_PREFIX_ALL,"shapes"); echo "Shapes_0 is $shapes_0

";

echo "Shapes_1 is $shapes_1 "; ?>

 </source>