PHP比较两个CSV文件并突出显示差异

Question

I want to compare two CSV files and highlight the difference where it occurs. At the moment I have a small script that reads both CSV files and prints out the content on to the browser. these files are structured the same in term of column number but the values in some rows are different and I would like to highlight this difference but not to sure where to start from:

PHP Code:

<?php
$file = fopen("try.csv","r");
$file2 = fopen("try2.csv", "r");

if(! feof($file)){

    while($data = fgetcsv($file))
    {
        foreach($data as $element){
            echo $element.'   ';
        }

        echo '<br />';


    }
}

echo '<br />';
echo ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>New File<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<";
echo '<br />';

if(! feof($file2)){

    while($data = fgetcsv($file2))
    {
        foreach($data as $element2){
            echo $element2.'   ';
        }

        echo '<br />';


    }
}


fclose($file);
?>

Knowing that the variables $element & $element2 hold the CSV content how can I find the differences....?

Answer 1

fgetcsv returns an array for the current row, so if memory isn't an issue, you could pull in the rows of the first csv and store each row in an array like $csv_1 and then the second as $csv_2 and then use array_udiff to find the non-overlapping rows.

function row_compare($a, $b)
{
    if ($a === $b) {
        return 0;
    }

    return (implode("",$a) < implode("",$b) ) ? -1 : 1;
}

$file1 = new SplFileObject("try.csv");
$file1->setFlags(SplFileObject::READ_CSV);

$file2 = new SplFileObject("try2.csv");
$file2->setFlags(SplFileObject::READ_CSV);

foreach ($file1 as $row) {
    $csv_1[] = $row;
}

foreach ($file2 as $row) {
    $csv_2[] = $row;
}

$unique_to_csv1 = array_udiff($csv_1, $csv_2, 'row_compare');
$unique_to_csv2 = array_udiff($csv_2, $csv_1, 'row_compare');

$all_unique_rows = array_merge($unique_to_csv1,$unique_to_csv2);

foreach($all_unique_rows as $unique_row) {
    foreach($unique_row as $element) {
        echo $element . "   ";
    }
    echo '<br />';
}

Answer 2

this code take me time, but now, it can be simplest?

$filename="nomes.csv"; //lista completa 
$base="track.opened.csv"; //mark if it is on here 
$NOWcodes = array();

$file = fopen($base, 'r'); //registred opened 
while (($line = fgetcsv($file)) !== FALSE) { array_push($NOWcodes, $line[0]);  }
fclose($file);

$file = fopen($filename, 'r'); //all nomes 
while (($line = fgetcsv($file)) !== FALSE) {

if(!in_array($line[0],$NOWcodes)){$inscrito='yellow;';}
else{$inscrito='#9999ff;';} 

echo '<span style="background-color: '.$inscrito.'" title="'.$line[0].'">'.$line[2].'</span><br>'; }
fclose($file);