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PHP - Array_diff Help!
I have a very simple script which should be working with no problems. I have 2 arrays, and I'm simply trying to array_diff them to get the results from array1 which are not present in array2.
$scrubbed = array_diff($numbers, $dnc); print_r($numbers); print_r($dnc); print_r($scrubbed); The results: Code: [Select] Array ( [0] => 3042476001 [1] => 3042476002 [2] => 3042476003 [3] => 3042476004 [4] => 3042476005 [5] => 3042476006 [6] => 3042476007 [7] => 3042476008 [8] => 3042476009 [9] => 3042476010 [10] => 3042476011 [11] => 3042476012 [12] => 3042476013 [13] => 3042476014 [14] => 3047655291 [15] => 3047281328 ) Array ( [0] => 3042476068 [1] => 3047281328 [2] => 3047652846 [3] => 3047652982 [4] => 3047655291 [5] => 3047655398 [6] => 3047655458 [7] => 3047655719 [8] => 3047657562 [9] => 3047657747 ) Array ( [0] => 3042476001 [1] => 3042476002 [2] => 3042476003 [3] => 3042476004 [4] => 3042476005 [5] => 3042476006 [6] => 3042476007 [7] => 3042476008 [8] => 3042476009 [9] => 3042476010 [10] => 3042476011 [11] => 3042476012 [12] => 3042476013 [13] => 3042476014 [14] => 3047655291 [15] => 3047281328 ) Now, $numbers is drawn from a single column .csv file, and $dnc is concatenated from anywhere between 1 and 3 mysql database queries (there are 3 seperate Do Not Call lists). There are 2 numbers from $numbers which should have been removed, but are not. I have tried intval() to make sure all types are the same using array_walk(), and I have also tried to trim() with array_walk() in case there were any extra characters not showing up on the print_r. I am at quite a loss here Someone help? EDIT: I have also tried to use the following work around functions function array_diff_alt($array1, $array2){ $result = array(); foreach ($array1 as $value){ if (!in_array($value, $array2)){ $result[] = $value; } } return $result; } function array_diff_alt($a, $b) { $map = $out = array(); foreach($a as $val) $map[$val] = 1; foreach($b as $val) unset($map[$val]); return array_keys($map); } function array_diff_alt($a, $b) { $result = array(); foreach ($a as $avalue){ foreach ($b as $bvalue){ if ($avalue != $bvalue){ $result[] = $avalue; break; } } } return $result; } Similar TutorialsI have two strings: $string = shell_exec('reg.bat '.$arg); //returns word\0word\0word $stringA = "$string"; $stringB = "word,other,word2,other2"; $array1 = explode('\0', $stringA); $array2 = explode(',', $stringB); $result = array_diff($array1, $array2); I can use array_diff to find the differences, but the last word in $array1 shows up as not in both strings even though it is because of the \0 delimiter. How can I include the last word as well? Why is this not working??? If $adsused prints out: 1, 5, 6, 7, while ($tarray=mysql_fetch_array($admintotadsq)){ $adsused .= $tarray['adnr'].', '; } $array1 = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20); $array2 = array($adsused); $diff = array_diff($array1, $array2); print_r($diff); print_r($diff); prints out: Array ( => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 [9] => 10 [10] => 11 [11] => 12 [12] => 13 [13] => 14 [14] => 15 [15] => 16 [16] => 17 [17] => 18 [18] => 19 [19] => 20 ) What am I doing wrong? I am trying to understand why the following code outputs the value of 4 (it is part of a PHP quiz question). I know that array_diff will compare one array with another and return the result but I just don't understand what is going on with the code below: Code: [Select] <?php $a = array(1,2,4,8); $b = array(0,2,4,6,8,10); echo count (array_merge(array_diff($a, $b), array_diff($b, $a))); //prints 4 ?> Would someone be able to walk me through it? I have two arrays of strings, one is read in from a file, the other is collected on a previous page using js and passed with a form through $_POST. The array from the file I label $oldImages and the array from the previous page I label $newImages (each is a list of image URLs). I need to compare the two and add them together so that there are no duplicate entries. I'm using array_diff() on them and the result I'm getting includes one entry that is in both arrays. I've tried different ways of reading the file, none of them seem to make any difference in the results. I've been printing the arrays with print_r() to have a look at the contents of the arrays and I decided to use implode() and explode(), and str_replace() to try to remove any irregularities that might be in the objects somehow which I'm not seeing. I'm not a PHP programmer, BTW. Here is some code. I've also attached a screenshot for you--link at the bottom. Code: [Select] <body> <?php $file = file("image_list.txt") or exit("Unable to open file!"); $oldImages = implode($file); $oldImages = str_replace(" ", "", $oldImages); $oldImages = explode("\n", $oldImages); $newImages = implode($_POST); $newImages = str_replace(" ", "", $newImages); $newImages = explode("\n", $newImages); $newAdditions = array_diff($newImages, $oldImages); print_r($newImages); echo '<br><br>'; print_r($oldImages); echo ' <form method="post" action="#"> New Images<br> <textarea id="displayText" rows="5" cols="105" wrap="off" name="existing"> '; foreach($newImages as $key => $entry) echo $entry; //echo $newImages; echo ' </textarea> <br> Stored Images<br> <textarea id="newText" rows="5" cols="105" wrap="off" name="new"> '; foreach($oldImages as $key => $entry) echo $entry; //echo $oldImages; echo ' </textarea> <input type="submit" class="button" value="Submit"><br> </form> Newly Generated Image List<br> <textarea id="newText" rows="30" cols="105" wrap="off" name="new"> '; foreach($newAdditions as $key => $entry) echo $entry; echo ' </textarea> '; ?> <div class="clear"></div> </body> Here is the code from the previous page which produces the array that is stored in $_POST. What you can't see in this code is the javascript functions toggleEntry() and displayList(). All they do is handle the addition and removal of image URL strings to/from the textarea object, which I do using document.getElementById('text').InnerHTML=$myList, where $myList has strings being added or removed to/from it. Code: [Select] <script type="text/javascript" src="/js/user_selection_list_builder.js"></script> <script type="text/javascript"> function toggleAndDisplay(key) { toggleEntry(key); displayList(); } </script> </head> <body> <form method="post" action="add_images2.php"> Selected Images<br> <textarea id="displayText" rows="10" cols="90" wrap="off" name="comments"> </textarea> <input type="submit" class="button" value="Submit"> </form> <div class="clear"></div> <?php $i = 2; include 'simple_html_dom.php'; if($i===1) $html = file_get_html('lookbook-source.htm'); elseif($i===2) $html = file_get_html('http://lookbook.nu/preference/look-list-gender/girls'); elseif($i===3) $html = file_get_html('http://lookbook.nu/new'); // Match all div tags of the class 'look_photo'. foreach($html->find('div[class=look_photo]') as $key => $entry) { echo " <div class='imgBox'> <a href='javascript:toggleAndDisplay(".$key.")'><img id='".$key."' src='".$entry->last_child()->last_child()->src."'></a> </div> "; } ?> </body> |
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