<?php

/* open the file */

if (($handle = fopen('test.csv', 'rb')) === false) {
    echo 'error while opening the file';
    exit;
}

$length = 1024;// 1 ko, increase if lines longer
$separator = ';';// adapt to csv format
$enclosure = '"';// adapt to csv format

/* skip the first line (header) */

fgetcsv($handle, $length, $separator, $enclosure);

/* loop over the rest of the file */

while (($data = fgetcsv($handle, $length, $separator, $enclosure)) !== false) {

    /* skip the line if not valid */

    if (validateLine($data) === false) {
        continue;
    }

    /* do something with $data */

    echo implode(';', $data) . '<br/>';
}

/* close the file */

fclose($handle);

/* function to validate the line */

function validateLine($data): bool
{
    /* let's say we keep the line if at least 80% of the columns are filled */

    $successRate = 0.8;// 0 to 1 for 0% to 100%
    $colsNumber = count($data);

    $colsFilled = 0;
    foreach ($data as $value) {
        if (!empty($value)) {
            ++$colsFilled;
        }
    }

    return $colsFilled / $colsNumber >= $successRate;
}

Bah dans ce cas pour chaque ligne tu vérifies si ce qui doit être rempli l'est et tu n'affiches la ligne que si c'est le cas.

foreach ($rows as $row) {
    if (/* colx non vide && coly non vide && ... */) {
        // afficher la ligne...
    }
}

if ($row != 0 && !in_array($row, $linesToSkip)) {
   //...
}

$linesToSkip[] = 0;

if (!in_array($row, $linesToSkip)) {
    //...
}

Je les ai mis dans une variable qui a cette forme $ligne_a_supprimmer = 5-9-8-25-63;

$linesToSkip = [0,1,255];
$linesToSkip = array_combine($linesToSkip, $linesToSkip);
foreach ($rows as $i => $row) {
    if (!isset($linesToSkip[$i])) {}
}

$linesToSkip = [0,1,255];
foreach ($rows as $i => $row) {
    if (!in_array($i, $linesToSkip)) {
        // afficher la ligne...
    }
}

foreach ($rows as $row) {
    if ($row['col1quidoitpasetrevide'] !== '' && $row['col2quidoitpasetrevide'] !== '' /* && etc */) {
        // afficher la ligne...
    }
}

foreach ($rows as $row) {
    if (/* colx non vide && coly non vide && ... */) {
        // afficher la ligne...
    }
}

$linesToSkip = [0,1,255];
foreach ($rows as $i => $row) {
    if (!in_array($i, $linesToSkip)) {
        // afficher la ligne...
    }
}