PHP/Data Structure/array filter

Array filter

   <source lang="html4strict">

<?php

 function array_display($array, $pre=FALSE)
 {
   $tag = $pre ? "pre" : "p";
   printf("<%s>%s</%s>\n", $tag, var_export($array, TRUE), $tag);
 }
 
 $arr = array(2, "two", 0, "NULL", NULL, "FALSE", FALSE, "empty", "");
 $copy = array_filter($arr);
 $reindexed = array_values($copy);

print "

Original:

";

 array_display($arr, TRUE);

print "

Filtered:

";

 array_display($copy, TRUE);

print "

Filtered and re-indexed:

";

 array_display($reindexed, TRUE);

?>

 </source>
   
  

array_filter demo

   <source lang="html4strict">

<?php function array_display($array, $pre=FALSE) {

   $tag = $pre ? "pre" : "p"; 
   printf("<%s>%s</%s>\n", $tag, var_export($array, TRUE), $tag); 

} $arr = array(2, "two", 0, "NULL", NULL, "FALSE", FALSE, "empty", ""); $copy = array_filter($arr); $reindexed = array_values($copy);

array_display($arr, TRUE);

print "

Filtered:

";

array_display($copy, TRUE);

print "

Filtered and reindexed:

";

array_display($reindexed, TRUE); ?>

 </source>
   
  

array_filter( ) filters elements through a function

   <source lang="html4strict">

array array_filter ( array arr [, function callback] ) <?

   function endswithy($value) {
           return (substr($value, -1) == "y");
   }
   $people = array("Johnny", "Timmy", "Bobby", "Sam", "Tammy", "Joe");
   $withy = array_filter($people, "endswithy");
   var_dump($withy);

?>

 </source>
   
  

Filtering Arrays Using array_filter()

   <source lang="html4strict">

<?php function array_display($array, $pre=FALSE) {

   $tag = $pre ? "pre" : "p"; 
   printf("<%s>%s</%s>\n", $tag, var_export($array, TRUE), $tag); 

} function is_romance($lang) {

   return in_array($lang, array("French", "Spanish", "Portuguese", "Italian")); 

}

$countries = array( "USA" => "English", "Spain" => "Spanish", "Brazil" => "Portuguese"); $rom_countries = array_filter($countries, "is_romance"); array_display($rom_countries, TRUE); ?>

 </source>
   
  

Using the array_filter() Function

   <source lang="html4strict">

<?php

   function filter_values($value) {
       if($value > 10) return true;
       return false;
   }
   $myints = array(123,45,2345,3,42);
   $filtered = array_filter($myints, "filter_values");
   print_r($filtered);

?>

 </source>