Set operations

Performs set operations on two lists.

Source code (hide)

Global files are not shown below.

Table of contents
  1. index.php

index.php

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<?php
/* globals, templates */
$locals = array (
    'title'       => 'Set operations',
    'description' => 'Performs set operations on two lists.',
    'files'       => array('index.php')
);
include('../globals/globals.php');
include('../globals/forms.php');

/************
** input
************/
$set_a     = $_POST['set_a'];
$set_b     = $_POST['set_b'];
$operation = $_POST['operation'];
$unique    = $_POST['unique'];
$sort      = $_POST['sort'];

// input form
?>
<form action="" method="post">
    <fieldset>
        <legend>Input</legend>
    
        <p>Enter a newline-delimited list into each box, then select the set operation you want to perform.</p>
        <textarea id="set_a" name="set_a" rows="12" cols="100" style="width:30em; float:left; margin-right:1em;"><?php echo $set_a; ?></textarea>
        <textarea id="set_b" name="set_b" rows="12" cols="100" style="width:30em;"><?php echo $set_b; ?></textarea><br clear="all" />
        
        Set operation:<br />
        <input type="radio" id="difference" name="operation" value="difference" style="margin-left:4em;" <?php gCheckRadio($operation,'difference'); ?> />
        <label for="difference">difference (A - B)</label><br />
        
        <input type="radio" id="intersection" name="operation" value="intersection" style="margin-left:4em;" <?php gCheckRadio($operation,'intersection'); ?> />
        <label for="intersection">intersection</label><br />
        
        <input type="radio" id="union" name="operation" value="union" style="margin-left:4em;" <?php gCheckRadio($operation,'union'); ?> />
        <label for="union">union</label><br />
        
        <?php
        echo checkbox('unique', $unique, 'Remove duplicate items'), '<br />';
        echo checkbox('sort', $sort, 'Sort'), '<br />';
        gDebugOption();
        ?>
            
        <input type="submit" value="Process" />
    </fieldset>
</form>

<?php
if($_POST['operation']) {
    /************
    ** Operation
    ************/
    // break input into arrays
    $set_a = explode("\r\n", $set_a);
    $set_b = explode("\r\n", $set_b);
    
    // perform operation
    switch($operation) {
        case 'difference':
            $result = array_diff($set_a, $set_b);
            break;
        
        case 'intersection':
            $result = array_intersect($set_a, $set_b);
            break;
        
        case 'union':
            $result = array_merge($set_a, $set_b);
            break;
    }
    
    // filter duplicates & sort
    if($unique)
        $result = array_unique($result);
    if($sort)
        sort($result);
    
    // merge array into output
    $output = implode("\n", $result);
    
    /************
    ** Output
    ************/
    // result
    echo '<h2>Result of ', $operation, '</h2>',
         '<textarea rows="12" cols="100">', $output, '</textarea>';
    
    // debug
    gDebug(get_defined_vars());
}
/* globals, templates */
makeFooter();
?>
Input

Enter a newline-delimited list into each box, then select the set operation you want to perform.


Set operation:






This tool is written and copyright by Jesse Plamondon-Willard (Pathoschild). You may freely use, distribute, and modify this script in any way and for any purpose, so long as you cite the above name as original author.